Cross-Referenced Linux and Device Driver Code

   #ifndef _LINUX_SCHED_H
   #define _LINUX_SCHED_H
   
   /*
    * cloning flags:
    */
   #define CSIGNAL         0x000000ff      /* signal mask to be sent at exit */
   #define CLONE_VM        0x00000100      /* set if VM shared between processes */
   #define CLONE_FS        0x00000200      /* set if fs info shared between processes */
  #define CLONE_FILES     0x00000400      /* set if open files shared between processes */
  #define CLONE_SIGHAND   0x00000800      /* set if signal handlers and blocked signals shared */
  #define CLONE_PTRACE    0x00002000      /* set if we want to let tracing continue on the child too */
  #define CLONE_VFORK     0x00004000      /* set if the parent wants the child to wake it up on mm_release */
  #define CLONE_PARENT    0x00008000      /* set if we want to have the same parent as the cloner */
  #define CLONE_THREAD    0x00010000      /* Same thread group? */
  #define CLONE_NEWNS     0x00020000      /* New namespace group? */
  #define CLONE_SYSVSEM   0x00040000      /* share system V SEM_UNDO semantics */
  #define CLONE_SETTLS    0x00080000      /* create a new TLS for the child */
  #define CLONE_PARENT_SETTID     0x00100000      /* set the TID in the parent */
  #define CLONE_CHILD_CLEARTID    0x00200000      /* clear the TID in the child */
  #define CLONE_DETACHED          0x00400000      /* Unused, ignored */
  #define CLONE_UNTRACED          0x00800000      /* set if the tracing process can't force CLONE_PTRACE on this clone */
  #define CLONE_CHILD_SETTID      0x01000000      /* set the TID in the child */
  #define CLONE_STOPPED           0x02000000      /* Start in stopped state */
  #define CLONE_NEWUTS            0x04000000      /* New utsname group? */
  #define CLONE_NEWIPC            0x08000000      /* New ipcs */
  #define CLONE_NEWUSER           0x10000000      /* New user namespace */
  #define CLONE_NEWPID            0x20000000      /* New pid namespace */
  #define CLONE_NEWNET            0x40000000      /* New network namespace */
  #define CLONE_IO                0x80000000      /* Clone io context */
  
  /*
   * Scheduling policies
   */
  #define SCHED_NORMAL            0
  #define SCHED_FIFO              1
  #define SCHED_RR                2
  #define SCHED_BATCH             3
  /* SCHED_ISO: reserved but not implemented yet */
  #define SCHED_IDLE              5
  
  #ifdef __KERNEL__
  
  struct sched_param {
          int sched_priority;
  };
  
  #include <asm/param.h>  /* for HZ */
  
  #include <linux/capability.h>
  #include <linux/threads.h>
  #include <linux/kernel.h>
  #include <linux/types.h>
  #include <linux/timex.h>
  #include <linux/jiffies.h>
  #include <linux/rbtree.h>
  #include <linux/thread_info.h>
  #include <linux/cpumask.h>
  #include <linux/errno.h>
  #include <linux/nodemask.h>
  #include <linux/mm_types.h>
  
  #include <asm/system.h>
  #include <asm/semaphore.h>
  #include <asm/page.h>
  #include <asm/ptrace.h>
  #include <asm/cputime.h>
  
  #include <linux/smp.h>
  #include <linux/sem.h>
  #include <linux/signal.h>
  #include <linux/securebits.h>
  #include <linux/fs_struct.h>
  #include <linux/compiler.h>
  #include <linux/completion.h>
  #include <linux/pid.h>
  #include <linux/percpu.h>
  #include <linux/topology.h>
  #include <linux/proportions.h>
  #include <linux/seccomp.h>
  #include <linux/rcupdate.h>
  #include <linux/rtmutex.h>
  
  #include <linux/time.h>
  #include <linux/param.h>
  #include <linux/resource.h>
  #include <linux/timer.h>
  #include <linux/hrtimer.h>
  #include <linux/task_io_accounting.h>
  #include <linux/kobject.h>
  #include <linux/latencytop.h>
  
  #include <asm/processor.h>
  
  #ifdef CONFIG_PREEMPT
  extern int kernel_preemption;
  #else
  # define kernel_preemption 0
  #endif
 #ifdef CONFIG_PREEMPT_VOLUNTARY
 extern int voluntary_preemption;
 #else
 # define voluntary_preemption 0
 #endif
 #ifdef CONFIG_PREEMPT_SOFTIRQS
 extern int softirq_preemption;
 #else
 # define softirq_preemption 0
 #endif
 
 #ifdef CONFIG_PREEMPT_HARDIRQS
 extern int hardirq_preemption;
 #else
 # define hardirq_preemption 0
 #endif
 
 struct mem_cgroup;
 struct exec_domain;
 struct futex_pi_state;
 struct robust_list_head;
 struct bio;
 
 /*
  * List of flags we want to share for kernel threads,
  * if only because they are not used by them anyway.
  */
 #define CLONE_KERNEL    (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
 
 /*
  * These are the constant used to fake the fixed-point load-average
  * counting. Some notes:
  *  - 11 bit fractions expand to 22 bits by the multiplies: this gives
  *    a load-average precision of 10 bits integer + 11 bits fractional
  *  - if you want to count load-averages more often, you need more
  *    precision, or rounding will get you. With 2-second counting freq,
  *    the EXP_n values would be 1981, 2034 and 2043 if still using only
  *    11 bit fractions.
  */
 extern unsigned long avenrun[];         /* Load averages */
 
 #define FSHIFT          11              /* nr of bits of precision */
 #define FIXED_1         (1<<FSHIFT)     /* 1.0 as fixed-point */
 #define LOAD_FREQ       (5*HZ+1)        /* 5 sec intervals */
 #define EXP_1           1884            /* 1/exp(5sec/1min) as fixed-point */
 #define EXP_5           2014            /* 1/exp(5sec/5min) */
 #define EXP_15          2037            /* 1/exp(5sec/15min) */
 
 #define CALC_LOAD(load,exp,n) \
         load *= exp; \
         load += n*(FIXED_1-exp); \
         load >>= FSHIFT;
 
 extern unsigned long total_forks;
 extern int nr_threads;
 DECLARE_PER_CPU(unsigned long, process_counts);
 extern int nr_processes(void);
 extern unsigned long nr_running(void);
 extern unsigned long nr_uninterruptible(void);
 extern unsigned long nr_active(void);
 extern unsigned long nr_iowait(void);
 extern unsigned long weighted_cpuload(const int cpu);
 
 struct seq_file;
 struct cfs_rq;
 struct task_group;
 #ifdef CONFIG_SCHED_DEBUG
 extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
 extern void proc_sched_set_task(struct task_struct *p);
 extern void
 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
 #else
 static inline void
 proc_sched_show_task(struct task_struct *p, struct seq_file *m)
 {
 }
 static inline void proc_sched_set_task(struct task_struct *p)
 {
 }
 static inline void
 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 {
 }
 #endif
 
 extern struct semaphore kernel_sem;
 
 /*
  * Task state bitmask. NOTE! These bits are also
  * encoded in fs/proc/array.c: get_task_state().
  *
  * We have two separate sets of flags: task->state
  * is about runnability, while task->exit_state are
  * about the task exiting. Confusing, but this way
  * modifying one set can't modify the other one by
  * mistake.
  */
 #define TASK_RUNNING            0
 #define TASK_RUNNING_MUTEX      1
 #define TASK_INTERRUPTIBLE      2
 #define TASK_UNINTERRUPTIBLE    4
 #define __TASK_STOPPED          8
 #define __TASK_TRACED           16
 /* in tsk->exit_state */
 #define EXIT_ZOMBIE             32
 #define EXIT_DEAD               64
 /* in tsk->state again */
 #define TASK_NONINTERACTIVE     128
 #define TASK_DEAD               256
 #define TASK_WAKEKILL           512
 
 /* Convenience macros for the sake of set_task_state */
 #define TASK_KILLABLE           (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
 #define TASK_STOPPED            (TASK_WAKEKILL | __TASK_STOPPED)
 #define TASK_TRACED             (TASK_WAKEKILL | __TASK_TRACED)
 
 /* Convenience macros for the sake of wake_up */
 #define TASK_NORMAL             (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
 #define TASK_ALL                (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED | \
                                  TASK_RUNNING_MUTEX)
 
 /* get_task_state() */
 #define TASK_REPORT             (TASK_RUNNING | TASK_RUNNING_MUTEX | \
                                  TASK_INTERRUPTIBLE | \
                                  TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
                                  __TASK_TRACED)
 
 #define task_is_traced(task)    ((task->state & __TASK_TRACED) != 0)
 #define task_is_stopped(task)   ((task->state & __TASK_STOPPED) != 0)
 #define task_is_stopped_or_traced(task) \
                         ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
 #define task_contributes_to_load(task)  \
                                 ((task->state & TASK_UNINTERRUPTIBLE) != 0)
 
 #define __set_task_state(tsk, state_value)              \
         do { (tsk)->state = (state_value); } while (0)
 #define set_task_state(tsk, state_value)                \
         set_mb((tsk)->state, (state_value))
 
 // #define PREEMPT_DIRECT
 
 #ifdef CONFIG_X86_LOCAL_APIC
 extern void nmi_show_all_regs(void);
 #else
 # define nmi_show_all_regs() do { } while (0)
 #endif
 
 #include <linux/smp.h>
 #include <linux/sem.h>
 #include <linux/signal.h>
 #include <linux/securebits.h>
 #include <linux/fs_struct.h>
 #include <linux/compiler.h>
 #include <linux/completion.h>
 #include <linux/pid.h>
 #include <linux/percpu.h>
 #include <linux/topology.h>
 #include <linux/seccomp.h>
 
 struct exec_domain;
 
 /*
  * set_current_state() includes a barrier so that the write of current->state
  * is correctly serialised wrt the caller's subsequent test of whether to
  * actually sleep:
  *
  *      set_current_state(TASK_UNINTERRUPTIBLE);
  *      if (do_i_need_to_sleep())
  *              schedule();
  *
  * If the caller does not need such serialisation then use __set_current_state()
  */
 #define __set_current_state(state_value)                        \
         do { current->state = (state_value); } while (0)
 #define set_current_state(state_value)          \
         set_mb(current->state, (state_value))
 
 /* Task command name length */
 #define TASK_COMM_LEN 16
 
 #include <linux/spinlock.h>
 
 /*
  * This serializes "schedule()" and also protects
  * the run-queue from deletions/modifications (but
  * _adding_ to the beginning of the run-queue has
  * a separate lock).
  */
 extern rwlock_t tasklist_lock;
 extern spinlock_t mmlist_lock;
 
 struct task_struct;
 
 extern void sched_init(void);
 extern void sched_init_smp(void);
 extern asmlinkage void schedule_tail(struct task_struct *prev);
 extern void init_idle(struct task_struct *idle, int cpu);
 extern void init_idle_bootup_task(struct task_struct *idle);
 
 extern int runqueue_is_locked(void);
 
 extern cpumask_t nohz_cpu_mask;
 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
 extern int select_nohz_load_balancer(int cpu);
 #else
 static inline int select_nohz_load_balancer(int cpu)
 {
         return 0;
 }
 #endif
 
 extern unsigned long rt_needs_cpu(int cpu);
 
 /*
  * Only dump TASK_* tasks. (0 for all tasks)
  */
 extern void show_state_filter(unsigned long state_filter);
 
 static inline void show_state(void)
 {
         show_state_filter(0);
 }
 
 extern void show_regs(struct pt_regs *);
 extern int irq_show_regs_callback(int cpu, struct pt_regs *regs);
 
 /*
  * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
  * task), SP is the stack pointer of the first frame that should be shown in the back
  * trace (or NULL if the entire call-chain of the task should be shown).
  */
 extern void show_stack(struct task_struct *task, unsigned long *sp);
 
 void io_schedule(void);
 long io_schedule_timeout(long timeout);
 
 extern void cpu_init (void);
 extern void trap_init(void);
 extern void account_process_tick(struct task_struct *task, int user);
 extern void update_process_times(int user);
 extern void scheduler_tick(void);
 extern void hrtick_resched(void);
 
 extern void sched_show_task(struct task_struct *p);
 
 #ifdef CONFIG_GENERIC_HARDIRQS
 extern int debug_direct_keyboard;
 #else
 # define debug_direct_keyboard 0
 #endif
 
 #ifdef CONFIG_DETECT_SOFTLOCKUP
 extern void softlockup_tick(void);
 extern void spawn_softlockup_task(void);
 extern void touch_softlockup_watchdog(void);
 extern void touch_all_softlockup_watchdogs(void);
 extern unsigned long  softlockup_thresh;
 extern unsigned long sysctl_hung_task_check_count;
 extern unsigned long sysctl_hung_task_timeout_secs;
 extern unsigned long sysctl_hung_task_warnings;
 #else
 static inline void softlockup_tick(void)
 {
 }
 static inline void spawn_softlockup_task(void)
 {
 }
 static inline void touch_softlockup_watchdog(void)
 {
 }
 static inline void touch_all_softlockup_watchdogs(void)
 {
 }
 #endif
 
 
 /* Attach to any functions which should be ignored in wchan output. */
 #define __sched         __attribute__((__section__(".sched.text")))
 
 /* Linker adds these: start and end of __sched functions */
 extern char __sched_text_start[], __sched_text_end[];
 
 /* Is this address in the __sched functions? */
 extern int in_sched_functions(unsigned long addr);
 
 #define MAX_SCHEDULE_TIMEOUT    LONG_MAX
 extern signed long schedule_timeout(signed long timeout);
 extern signed long schedule_timeout_interruptible(signed long timeout);
 extern signed long schedule_timeout_killable(signed long timeout);
 extern signed long schedule_timeout_uninterruptible(signed long timeout);
 asmlinkage void schedule(void);
 /*
  * This one can be called with interrupts disabled, only
  * to be used by lowlevel arch code!
  */
 asmlinkage void __sched __schedule(void);
 
 struct nsproxy;
 struct user_namespace;
 
 /* Maximum number of active map areas.. This is a random (large) number */
 #define DEFAULT_MAX_MAP_COUNT   65536
 
 extern int sysctl_max_map_count;
 
 #include <linux/aio.h>
 
 extern unsigned long
 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
                        unsigned long, unsigned long);
 extern unsigned long
 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
                           unsigned long len, unsigned long pgoff,
                           unsigned long flags);
 extern void arch_unmap_area(struct mm_struct *, unsigned long);
 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
 
 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
 /*
  * The mm counters are not protected by its page_table_lock,
  * so must be incremented atomically.
  */
 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
 
 #else  /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
 /*
  * The mm counters are protected by its page_table_lock,
  * so can be incremented directly.
  */
 #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
 #define get_mm_counter(mm, member) ((mm)->_##member)
 #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
 #define inc_mm_counter(mm, member) (mm)->_##member++
 #define dec_mm_counter(mm, member) (mm)->_##member--
 
 #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
 
 #define get_mm_rss(mm)                                  \
         (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
 #define update_hiwater_rss(mm)  do {                    \
         unsigned long _rss = get_mm_rss(mm);            \
         if ((mm)->hiwater_rss < _rss)                   \
                 (mm)->hiwater_rss = _rss;               \
 } while (0)
 #define update_hiwater_vm(mm)   do {                    \
         if ((mm)->hiwater_vm < (mm)->total_vm)          \
                 (mm)->hiwater_vm = (mm)->total_vm;      \
 } while (0)
 
 extern void set_dumpable(struct mm_struct *mm, int value);
 extern int get_dumpable(struct mm_struct *mm);
 
 /* mm flags */
 /* dumpable bits */
 #define MMF_DUMPABLE      0  /* core dump is permitted */
 #define MMF_DUMP_SECURELY 1  /* core file is readable only by root */
 #define MMF_DUMPABLE_BITS 2
 
 /* coredump filter bits */
 #define MMF_DUMP_ANON_PRIVATE   2
 #define MMF_DUMP_ANON_SHARED    3
 #define MMF_DUMP_MAPPED_PRIVATE 4
 #define MMF_DUMP_MAPPED_SHARED  5
 #define MMF_DUMP_ELF_HEADERS    6
 #define MMF_DUMP_FILTER_SHIFT   MMF_DUMPABLE_BITS
 #define MMF_DUMP_FILTER_BITS    5
 #define MMF_DUMP_FILTER_MASK \
         (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
 #define MMF_DUMP_FILTER_DEFAULT \
         ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED))
 
 struct sighand_struct {
         atomic_t                count;
         struct k_sigaction      action[_NSIG];
         spinlock_t              siglock;
         wait_queue_head_t       signalfd_wqh;
 };
 
 struct pacct_struct {
         int                     ac_flag;
         long                    ac_exitcode;
         unsigned long           ac_mem;
         cputime_t               ac_utime, ac_stime;
         unsigned long           ac_minflt, ac_majflt;
 };
 
 /*
  * NOTE! "signal_struct" does not have it's own
  * locking, because a shared signal_struct always
  * implies a shared sighand_struct, so locking
  * sighand_struct is always a proper superset of
  * the locking of signal_struct.
  */
 struct signal_struct {
         atomic_t                count;
         atomic_t                live;
 
         wait_queue_head_t       wait_chldexit;  /* for wait4() */
 
         /* current thread group signal load-balancing target: */
         struct task_struct      *curr_target;
 
         /* shared signal handling: */
         struct sigpending       shared_pending;
 
         /* thread group exit support */
         int                     group_exit_code;
         /* overloaded:
          * - notify group_exit_task when ->count is equal to notify_count
          * - everyone except group_exit_task is stopped during signal delivery
          *   of fatal signals, group_exit_task processes the signal.
          */
         struct task_struct      *group_exit_task;
         int                     notify_count;
 
         /* thread group stop support, overloads group_exit_code too */
         int                     group_stop_count;
         unsigned int            flags; /* see SIGNAL_* flags below */
 
         /* POSIX.1b Interval Timers */
         struct list_head posix_timers;
 
         /* ITIMER_REAL timer for the process */
         struct hrtimer real_timer;
         struct pid *leader_pid;
         ktime_t it_real_incr;
 
         /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
         cputime_t it_prof_expires, it_virt_expires;
         cputime_t it_prof_incr, it_virt_incr;
 
         /* job control IDs */
 
         /*
          * pgrp and session fields are deprecated.
          * use the task_session_Xnr and task_pgrp_Xnr routines below
          */
 
         union {
                 pid_t pgrp __deprecated;
                 pid_t __pgrp;
         };
 
         struct pid *tty_old_pgrp;
 
         union {
                 pid_t session __deprecated;
                 pid_t __session;
         };
 
         /* boolean value for session group leader */
         int leader;
 
         struct tty_struct *tty; /* NULL if no tty */
 
         /*
          * Cumulative resource counters for dead threads in the group,
          * and for reaped dead child processes forked by this group.
          * Live threads maintain their own counters and add to these
          * in __exit_signal, except for the group leader.
          */
         cputime_t utime, stime, cutime, cstime;
         cputime_t gtime;
         cputime_t cgtime;
         unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
         unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
         unsigned long inblock, oublock, cinblock, coublock;
 
         /*
          * Cumulative ns of scheduled CPU time for dead threads in the
          * group, not including a zombie group leader.  (This only differs
          * from jiffies_to_ns(utime + stime) if sched_clock uses something
          * other than jiffies.)
          */
         unsigned long long sum_sched_runtime;
 
         /*
          * We don't bother to synchronize most readers of this at all,
          * because there is no reader checking a limit that actually needs
          * to get both rlim_cur and rlim_max atomically, and either one
          * alone is a single word that can safely be read normally.
          * getrlimit/setrlimit use task_lock(current->group_leader) to
          * protect this instead of the siglock, because they really
          * have no need to disable irqs.
          */
         struct rlimit rlim[RLIM_NLIMITS];
 
         struct list_head cpu_timers[3];
 
         /* keep the process-shared keyrings here so that they do the right
          * thing in threads created with CLONE_THREAD */
 #ifdef CONFIG_KEYS
         struct key *session_keyring;    /* keyring inherited over fork */
         struct key *process_keyring;    /* keyring private to this process */
 #endif
 #ifdef CONFIG_BSD_PROCESS_ACCT
         struct pacct_struct pacct;      /* per-process accounting information */
 #endif
 #ifdef CONFIG_TASKSTATS
         struct taskstats *stats;
 #endif
 #ifdef CONFIG_AUDIT
         unsigned audit_tty;
         struct tty_audit_buf *tty_audit_buf;
 #endif
 };
 
 /* Context switch must be unlocked if interrupts are to be enabled */
 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
 # define __ARCH_WANT_UNLOCKED_CTXSW
 #endif
 
 /*
  * Bits in flags field of signal_struct.
  */
 #define SIGNAL_STOP_STOPPED     0x00000001 /* job control stop in effect */
 #define SIGNAL_STOP_DEQUEUED    0x00000002 /* stop signal dequeued */
 #define SIGNAL_STOP_CONTINUED   0x00000004 /* SIGCONT since WCONTINUED reap */
 #define SIGNAL_GROUP_EXIT       0x00000008 /* group exit in progress */
 
 #ifdef CONFIG_PREEMPT_RCU_BOOST
 #define set_rcu_prio(p, prio) /* cpp to avoid #include hell */ \
         do { \
                 (p)->rcu_prio = (prio); \
         } while (0)
 #define get_rcu_prio(p) (p)->rcu_prio  /* cpp to avoid #include hell */
 #else /* #ifdef CONFIG_PREEMPT_RCU_BOOST */
 static inline void set_rcu_prio(struct task_struct *p, int prio)
 {
 }
 #define get_rcu_prio(p) (MAX_PRIO)  /* cpp to use MAX_PRIO before it's defined */
 #endif /* #else #ifdef CONFIG_PREEMPT_RCU_BOOST */
 
 /* If true, all threads except ->group_exit_task have pending SIGKILL */
 static inline int signal_group_exit(const struct signal_struct *sig)
 {
         return  (sig->flags & SIGNAL_GROUP_EXIT) ||
                 (sig->group_exit_task != NULL);
 }
 
 /*
  * Some day this will be a full-fledged user tracking system..
  */
 struct user_struct {
         atomic_t __count;       /* reference count */
         atomic_t processes;     /* How many processes does this user have? */
         atomic_t files;         /* How many open files does this user have? */
         atomic_t sigpending;    /* How many pending signals does this user have? */
 #ifdef CONFIG_INOTIFY_USER
         atomic_t inotify_watches; /* How many inotify watches does this user have? */
         atomic_t inotify_devs;  /* How many inotify devs does this user have opened? */
 #endif
 #ifdef CONFIG_POSIX_MQUEUE
         /* protected by mq_lock */
         unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
 #endif
         unsigned long locked_shm; /* How many pages of mlocked shm ? */
 
 #ifdef CONFIG_KEYS
         struct key *uid_keyring;        /* UID specific keyring */
         struct key *session_keyring;    /* UID's default session keyring */
 #endif
 
         /* Hash table maintenance information */
         struct hlist_node uidhash_node;
         uid_t uid;
 
 #ifdef CONFIG_USER_SCHED
         struct task_group *tg;
 #ifdef CONFIG_SYSFS
         struct kobject kobj;
         struct work_struct work;
 #endif
 #endif
 };
 
 extern int uids_sysfs_init(void);
 
 extern struct user_struct *find_user(uid_t);
 
 extern struct user_struct root_user;
 #define INIT_USER (&root_user)
 
 struct backing_dev_info;
 struct reclaim_state;
 
 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
 struct sched_info {
         /* cumulative counters */
         unsigned long pcount;         /* # of times run on this cpu */
         unsigned long long cpu_time,  /* time spent on the cpu */
                            run_delay; /* time spent waiting on a runqueue */
 
         /* timestamps */
         unsigned long long last_arrival,/* when we last ran on a cpu */
                            last_queued; /* when we were last queued to run */
 #ifdef CONFIG_SCHEDSTATS
         /* BKL stats */
         unsigned int bkl_count;
 #endif
 };
 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
 
 #ifdef CONFIG_SCHEDSTATS
 extern const struct file_operations proc_schedstat_operations;
 #endif /* CONFIG_SCHEDSTATS */
 
 #ifdef CONFIG_TASK_DELAY_ACCT
 struct task_delay_info {
         spinlock_t      lock;
         unsigned int    flags;  /* Private per-task flags */
 
         /* For each stat XXX, add following, aligned appropriately
          *
          * struct timespec XXX_start, XXX_end;
          * u64 XXX_delay;
          * u32 XXX_count;
          *
          * Atomicity of updates to XXX_delay, XXX_count protected by
          * single lock above (split into XXX_lock if contention is an issue).
          */
 
         /*
          * XXX_count is incremented on every XXX operation, the delay
          * associated with the operation is added to XXX_delay.
          * XXX_delay contains the accumulated delay time in nanoseconds.
          */
         struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
         u64 blkio_delay;        /* wait for sync block io completion */
         u64 swapin_delay;       /* wait for swapin block io completion */
         u32 blkio_count;        /* total count of the number of sync block */
                                 /* io operations performed */
         u32 swapin_count;       /* total count of the number of swapin block */
                                 /* io operations performed */
 };
 #endif  /* CONFIG_TASK_DELAY_ACCT */
 
 static inline int sched_info_on(void)
 {
 #ifdef CONFIG_SCHEDSTATS
         return 1;
 #elif defined(CONFIG_TASK_DELAY_ACCT)
         extern int delayacct_on;
         return delayacct_on;
 #else
         return 0;
 #endif
 }
 
 enum cpu_idle_type {
         CPU_IDLE,
         CPU_NOT_IDLE,
         CPU_NEWLY_IDLE,
         CPU_MAX_IDLE_TYPES
 };
 
 /*
  * sched-domains (multiprocessor balancing) declarations:
  */
 
 /*
  * Increase resolution of nice-level calculations:
  */
 #define SCHED_LOAD_SHIFT        10
 #define SCHED_LOAD_SCALE        (1L << SCHED_LOAD_SHIFT)
 
 #define SCHED_LOAD_SCALE_FUZZ   SCHED_LOAD_SCALE
 
 #ifdef CONFIG_SMP
 #define SD_LOAD_BALANCE         1       /* Do load balancing on this domain. */
 #define SD_BALANCE_NEWIDLE      2       /* Balance when about to become idle */
 #define SD_BALANCE_EXEC         4       /* Balance on exec */
 #define SD_BALANCE_FORK         8       /* Balance on fork, clone */
 #define SD_WAKE_IDLE            16      /* Wake to idle CPU on task wakeup */
 #define SD_WAKE_AFFINE          32      /* Wake task to waking CPU */
 #define SD_WAKE_BALANCE         64      /* Perform balancing at task wakeup */
 #define SD_SHARE_CPUPOWER       128     /* Domain members share cpu power */
 #define SD_POWERSAVINGS_BALANCE 256     /* Balance for power savings */
 #define SD_SHARE_PKG_RESOURCES  512     /* Domain members share cpu pkg resources */
 #define SD_SERIALIZE            1024    /* Only a single load balancing instance */
 
 #define BALANCE_FOR_MC_POWER    \
         (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0)
 
 #define BALANCE_FOR_PKG_POWER   \
         ((sched_mc_power_savings || sched_smt_power_savings) ?  \
          SD_POWERSAVINGS_BALANCE : 0)
 
 #define test_sd_parent(sd, flag)        ((sd->parent &&         \
                                          (sd->parent->flags & flag)) ? 1 : 0)
 
 
 struct sched_group {
         struct sched_group *next;       /* Must be a circular list */
         cpumask_t cpumask;
 
         /*
          * CPU power of this group, SCHED_LOAD_SCALE being max power for a
          * single CPU. This is read only (except for setup, hotplug CPU).
          * Note : Never change cpu_power without recompute its reciprocal
          */
         unsigned int __cpu_power;
         /*
          * reciprocal value of cpu_power to avoid expensive divides
          * (see include/linux/reciprocal_div.h)
          */
         u32 reciprocal_cpu_power;
 };
 
 struct sched_domain {
         /* These fields must be setup */
         struct sched_domain *parent;    /* top domain must be null terminated */
         struct sched_domain *child;     /* bottom domain must be null terminated */
         struct sched_group *groups;     /* the balancing groups of the domain */
         cpumask_t span;                 /* span of all CPUs in this domain */
         unsigned long min_interval;     /* Minimum balance interval ms */
         unsigned long max_interval;     /* Maximum balance interval ms */
         unsigned int busy_factor;       /* less balancing by factor if busy */
         unsigned int imbalance_pct;     /* No balance until over watermark */
         unsigned int cache_nice_tries;  /* Leave cache hot tasks for # tries */
         unsigned int busy_idx;
         unsigned int idle_idx;
         unsigned int newidle_idx;
         unsigned int wake_idx;
         unsigned int forkexec_idx;
         int flags;                      /* See SD_* */
 
         /* Runtime fields. */
         unsigned long last_balance;     /* init to jiffies. units in jiffies */
         unsigned int balance_interval;  /* initialise to 1. units in ms. */
         unsigned int nr_balance_failed; /* initialise to 0 */
 
 #ifdef CONFIG_SCHEDSTATS
         /* load_balance() stats */
         unsigned int lb_count[CPU_MAX_IDLE_TYPES];
         unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
         unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
         unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
         unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
         unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
         unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
         unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
 
         /* Active load balancing */
         unsigned int alb_count;
         unsigned int alb_failed;
         unsigned int alb_pushed;
 
         /* SD_BALANCE_EXEC stats */
         unsigned int sbe_count;
         unsigned int sbe_balanced;
         unsigned int sbe_pushed;
 
         /* SD_BALANCE_FORK stats */
         unsigned int sbf_count;
         unsigned int sbf_balanced;
         unsigned int sbf_pushed;
 
         /* try_to_wake_up() stats */
         unsigned int ttwu_wake_remote;
         unsigned int ttwu_move_affine;
         unsigned int ttwu_move_balance;
 #endif
 };
 
 extern void partition_sched_domains(int ndoms_new, cpumask_t *doms_new);
 extern int arch_reinit_sched_domains(void);
 
 #endif  /* CONFIG_SMP */
 
 /*
  * A runqueue laden with a single nice 0 task scores a weighted_cpuload of
  * SCHED_LOAD_SCALE. This function returns 1 if any cpu is laden with a
  * task of nice 0 or enough lower priority tasks to bring up the
  * weighted_cpuload
  */
 static inline int above_background_load(void)
 {
         unsigned long cpu;
 
         for_each_online_cpu(cpu) {
                 if (weighted_cpuload(cpu) >= SCHED_LOAD_SCALE)
                         return 1;
         }
         return 0;
 }
 
 struct io_context;                      /* See blkdev.h */
 #define NGROUPS_SMALL           32
 #define NGROUPS_PER_BLOCK       ((unsigned int)(PAGE_SIZE / sizeof(gid_t)))
 struct group_info {
         int ngroups;
         atomic_t usage;
         gid_t small_block[NGROUPS_SMALL];
         int nblocks;
         gid_t *blocks[0];
 };
 
 /*
  * get_group_info() must be called with the owning task locked (via task_lock())
  * when task != current.  The reason being that the vast majority of callers are
  * looking at current->group_info, which can not be changed except by the
  * current task.  Changing current->group_info requires the task lock, too.
  */
 #define get_group_info(group_info) do { \
         atomic_inc(&(group_info)->usage); \
 } while (0)
 
 #define put_group_info(group_info) do { \
         if (atomic_dec_and_test(&(group_info)->usage)) \
                 groups_free(group_info); \
 } while (0)
 
 extern struct group_info *groups_alloc(int gidsetsize);
 extern void groups_free(struct group_info *group_info);
 extern int set_current_groups(struct group_info *group_info);
 extern int groups_search(struct group_info *group_info, gid_t grp);
 /* access the groups "array" with this macro */
 #define GROUP_AT(gi, i) \
     ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
 
 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
 extern void prefetch_stack(struct task_struct *t);
 #else
 static inline void prefetch_stack(struct task_struct *t) { }
 #endif
 
 struct audit_context;           /* See audit.c */
 struct mempolicy;
 struct pipe_inode_info;
 struct uts_namespace;
 
 struct rq;
 struct sched_domain;
 
 struct sched_class {
         const struct sched_class *next;
 
         void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
         void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
         void (*yield_task) (struct rq *rq);
         int  (*select_task_rq)(struct task_struct *p, int sync);
 
         void (*check_preempt_curr) (struct rq *rq, struct task_struct *p);
 
         struct task_struct * (*pick_next_task) (struct rq *rq);
         void (*put_prev_task) (struct rq *rq, struct task_struct *p);
 
 #ifdef CONFIG_SMP
         unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
                         struct rq *busiest, unsigned long max_load_move,
                         struct sched_domain *sd, enum cpu_idle_type idle,
                         int *all_pinned, int *this_best_prio);
 
         int (*move_one_task) (struct rq *this_rq, int this_cpu,
                               struct rq *busiest, struct sched_domain *sd,
                               enum cpu_idle_type idle);
         void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
         void (*post_schedule) (struct rq *this_rq);
         void (*task_wake_up) (struct rq *this_rq, struct task_struct *task);
 #endif
 
         void (*set_curr_task) (struct rq *rq);
         void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
         void (*task_new) (struct rq *rq, struct task_struct *p);
         void (*set_cpus_allowed)(struct task_struct *p, cpumask_t *newmask);
 
         void (*rq_online)(struct rq *rq);
         void (*rq_offline)(struct rq *rq);
 
         void (*switched_from) (struct rq *this_rq, struct task_struct *task,
                                int running);
         void (*switched_to) (struct rq *this_rq, struct task_struct *task,
                              int running);
         void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
                              int oldprio, int running);
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
         void (*moved_group) (struct task_struct *p);
 #endif
 };
 
 struct load_weight {
         unsigned long weight, inv_weight;
 };
 
 /*
  * CFS stats for a schedulable entity (task, task-group etc)
  *
  * Current field usage histogram:
  *
  *     4 se->block_start
  *     4 se->run_node
  *     4 se->sleep_start
  *     6 se->load.weight
  */
 struct sched_entity {
         struct load_weight      load;           /* for load-balancing */
         struct rb_node          run_node;
         unsigned int            on_rq;
 
         u64                     exec_start;
         u64                     sum_exec_runtime;
         u64                     vruntime;
         u64                     prev_sum_exec_runtime;
 
         u64                     last_wakeup;
         u64                     avg_overlap;
 
 #ifdef CONFIG_SCHEDSTATS
         u64                     wait_start;
         u64                     wait_max;
         u64                     wait_count;
         u64                     wait_sum;
 
         u64                     sleep_start;
         u64                     sleep_max;
         s64                     sum_sleep_runtime;
 
         u64                     block_start;
         u64                     block_max;
         u64                     exec_max;
         u64                     slice_max;
 
         u64                     nr_migrations;
         u64                     nr_migrations_cold;
         u64                     nr_failed_migrations_affine;
         u64                     nr_failed_migrations_running;
         u64                     nr_failed_migrations_hot;
         u64                     nr_forced_migrations;
         u64                     nr_forced2_migrations;
 
         u64                     nr_wakeups;
         u64                     nr_wakeups_sync;
         u64                     nr_wakeups_migrate;
         u64                     nr_wakeups_local;
         u64                     nr_wakeups_remote;
         u64                     nr_wakeups_affine;
         u64                     nr_wakeups_affine_attempts;
         u64                     nr_wakeups_passive;
         u64                     nr_wakeups_idle;
 #endif
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
         struct sched_entity     *parent;
         /* rq on which this entity is (to be) queued: */
         struct cfs_rq           *cfs_rq;
         /* rq "owned" by this entity/group: */
         struct cfs_rq           *my_q;
 #endif
 };
 
 struct sched_rt_entity {
         struct list_head run_list;
         unsigned int time_slice;
         unsigned long timeout;
         int nr_cpus_allowed;
 
 #ifdef CONFIG_RT_GROUP_SCHED
         struct sched_rt_entity  *parent;
         /* rq on which this entity is (to be) queued: */
         struct rt_rq            *rt_rq;
         /* rq "owned" by this entity/group: */
         struct rt_rq            *my_q;
 #endif
 };
 
 #ifdef CONFIG_PREEMPT_RT
 struct rw_mutex;
 struct reader_lock_struct {
         struct rw_mutex *lock;
         struct list_head list;
         struct task_struct *task;
         int count;
 };
 
 #endif
 struct task_struct {
         volatile long state;    /* -1 unrunnable, 0 runnable, >0 stopped */
         void *stack;
         atomic_t usage;
         unsigned int flags;     /* per process flags, defined below */
         unsigned int ptrace;
 
         int lock_depth;         /* BKL lock depth */
 
 #ifdef CONFIG_SMP
         int oncpu;
 #endif
 
         int prio, static_prio, normal_prio;
 #ifdef CONFIG_PREEMPT_RCU_BOOST
         int rcu_prio;
 #endif
         const struct sched_class *sched_class;
         struct sched_entity se;
         struct sched_rt_entity rt;
 
 #ifdef CONFIG_PREEMPT_NOTIFIERS
         /* list of struct preempt_notifier: */
         struct hlist_head preempt_notifiers;
 #endif
 
         /*
          * fpu_counter contains the number of consecutive context switches
          * that the FPU is used. If this is over a threshold, the lazy fpu
          * saving becomes unlazy to save the trap. This is an unsigned char
          * so that after 256 times the counter wraps and the behavior turns
          * lazy again; this to deal with bursty apps that only use FPU for
          * a short time
          */
         unsigned char fpu_counter;
         s8 oomkilladj; /* OOM kill score adjustment (bit shift). */
 #ifdef CONFIG_BLK_DEV_IO_TRACE
         unsigned int btrace_seq;
 #endif
 
         unsigned int policy;
         cpumask_t cpus_allowed;
 
 #ifdef CONFIG_PREEMPT_RCU
         int rcu_read_lock_nesting;
         int rcu_flipctr_idx;
 #endif /* #ifdef CONFIG_PREEMPT_RCU */
 
 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
         struct sched_info sched_info;
 #endif
 #ifdef CONFIG_PREEMPT_RCU_BOOST
         struct rcu_boost_dat *rcub_rbdp;
         enum rcu_boost_state rcub_state;
         struct list_head rcub_entry;
         unsigned long rcu_preempt_counter;
 #endif
 
         struct list_head tasks;
         /*
          * ptrace_list/ptrace_children forms the list of my children
          * that were stolen by a ptracer.
          */
         struct list_head ptrace_children;
         struct list_head ptrace_list;
 
         struct mm_struct *mm, *active_mm;
 
 /* task state */
         struct linux_binfmt *binfmt;
         int exit_state;
         int exit_code, exit_signal;
         int pdeath_signal;  /*  The signal sent when the parent dies  */
         /* ??? */
         unsigned int personality;
         unsigned did_exec:1;
         pid_t pid;
         pid_t tgid;
 
 #ifdef CONFIG_CC_STACKPROTECTOR
         /* Canary value for the -fstack-protector gcc feature */
         unsigned long stack_canary;
 #endif
         /* 
          * pointers to (original) parent process, youngest child, younger sibling,
          * older sibling, respectively.  (p->father can be replaced with 
          * p->parent->pid)
          */
         struct task_struct *real_parent; /* real parent process (when being debugged) */
         struct task_struct *parent;     /* parent process */
         /*
          * children/sibling forms the list of my children plus the
          * tasks I'm ptracing.
          */
         struct list_head children;      /* list of my children */
         struct list_head sibling;       /* linkage in my parent's children list */
         struct task_struct *group_leader;       /* threadgroup leader */
 
         /* PID/PID hash table linkage. */
         struct pid_link pids[PIDTYPE_MAX];
         struct list_head thread_group;
 
         struct completion *vfork_done;          /* for vfork() */
         int __user *set_child_tid;              /* CLONE_CHILD_SETTID */
         int __user *clear_child_tid;            /* CLONE_CHILD_CLEARTID */
 
         unsigned int rt_priority;
         cputime_t utime, stime, utimescaled, stimescaled;
         cputime_t gtime;
         cputime_t prev_utime, prev_stime;
         unsigned long nvcsw, nivcsw; /* context switch counts */
         struct timespec start_time;             /* monotonic time */
         struct timespec real_start_time;        /* boot based time */
 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
         unsigned long min_flt, maj_flt;
 
         cputime_t it_prof_expires, it_virt_expires;
         unsigned long long it_sched_expires;
         struct list_head cpu_timers[3];
 
         struct task_struct* posix_timer_list;
 
 /* process credentials */
         uid_t uid,euid,suid,fsuid;
         gid_t gid,egid,sgid,fsgid;
         struct group_info *group_info;
         kernel_cap_t   cap_effective, cap_inheritable, cap_permitted, cap_bset;
         unsigned keep_capabilities:1;
         struct user_struct *user;
 #ifdef CONFIG_KEYS
         struct key *request_key_auth;   /* assumed request_key authority */
         struct key *thread_keyring;     /* keyring private to this thread */
         unsigned char jit_keyring;      /* default keyring to attach requested keys to */
 #endif
         char comm[TASK_COMM_LEN]; /* executable name excluding path
                                      - access with [gs]et_task_comm (which lock
                                        it with task_lock())
                                      - initialized normally by flush_old_exec */
 /* file system info */
         int link_count, total_link_count;
 #ifdef CONFIG_SYSVIPC
 /* ipc stuff */
         struct sysv_sem sysvsem;
 #endif
 #ifdef CONFIG_DETECT_SOFTLOCKUP
 /* hung task detection */
         unsigned long last_switch_timestamp;
         unsigned long last_switch_count;
 #endif
 /* CPU-specific state of this task */
         struct thread_struct thread;
 /* filesystem information */
         struct fs_struct *fs;
 /* open file information */
         struct files_struct *files;
 /* namespaces */
         struct nsproxy *nsproxy;
 /* signal handlers */
         struct signal_struct *signal;
         struct sighand_struct *sighand;
 
         sigset_t blocked, real_blocked;
         sigset_t saved_sigmask;         /* To be restored with TIF_RESTORE_SIGMASK */
         struct sigpending pending;
 
         unsigned long sas_ss_sp;
         size_t sas_ss_size;
         int (*notifier)(void *priv);
         void *notifier_data;
         sigset_t *notifier_mask;
 #ifdef CONFIG_SECURITY
         void *security;
 #endif
         struct audit_context *audit_context;
 #ifdef CONFIG_AUDITSYSCALL
         uid_t loginuid;
         unsigned int sessionid;
 #endif
         seccomp_t seccomp;
 
 /* Thread group tracking */
         u32 parent_exec_id;
         u32 self_exec_id;
 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
         spinlock_t alloc_lock;
 
         /* Protection of the PI data structures: */
         raw_spinlock_t pi_lock;
 
 #ifdef CONFIG_RT_MUTEXES
         /* PI waiters blocked on a rt_mutex held by this task */
         struct plist_head pi_waiters;
         /* Deadlock detection and priority inheritance handling */
         struct rt_mutex_waiter *pi_blocked_on;
 #endif
 
 #ifdef CONFIG_DEBUG_MUTEXES
         /* mutex deadlock detection */
         struct mutex_waiter *blocked_on;
 #endif
         int pagefault_disabled;
 #ifdef CONFIG_TRACE_IRQFLAGS
         unsigned int irq_events;
         int hardirqs_enabled;
         unsigned long hardirq_enable_ip;
         unsigned int hardirq_enable_event;
         unsigned long hardirq_disable_ip;
         unsigned int hardirq_disable_event;
         int softirqs_enabled;
         unsigned long softirq_disable_ip;
         unsigned int softirq_disable_event;
         unsigned long softirq_enable_ip;
         unsigned int softirq_enable_event;
         int hardirq_context;
         int softirq_context;
 #endif
 #ifdef CONFIG_LOCKDEP
 # define MAX_LOCK_DEPTH 48UL
         u64 curr_chain_key;
         int lockdep_depth;
         struct held_lock held_locks[MAX_LOCK_DEPTH];
         unsigned int lockdep_recursion;
 #endif
 
 #define MAX_PREEMPT_TRACE 25
 #define MAX_RWLOCK_DEPTH 5
 
 #ifdef CONFIG_PREEMPT_RT
         int reader_lock_count;
         struct reader_lock_struct owned_read_locks[MAX_RWLOCK_DEPTH];
 #endif
 
 #ifdef CONFIG_PREEMPT_TRACE
         unsigned long preempt_trace_eip[MAX_PREEMPT_TRACE];
         unsigned long preempt_trace_parent_eip[MAX_PREEMPT_TRACE];
 #endif
 
 #define MAX_LOCK_STACK  MAX_PREEMPT_TRACE
 #ifdef CONFIG_DEBUG_PREEMPT
         int lock_count;
 # ifdef CONFIG_PREEMPT_RT
         struct rt_mutex *owned_lock[MAX_LOCK_STACK];
 # endif
 #endif
 #ifdef CONFIG_DETECT_SOFTLOCKUP
         unsigned long   softlockup_count; /* Count to keep track how long the
                                            *  thread is in the kernel without
                                            *  sleeping.
                                            */
 #endif
         /* realtime bits */
 
 #ifdef CONFIG_DEBUG_RT_MUTEXES
         void *last_kernel_lock;
 #endif
 
 /* journalling filesystem info */
         void *journal_info;
 
 /* stacked block device info */
         struct bio *bio_list, **bio_tail;
 
 /* VM state */
         struct reclaim_state *reclaim_state;
 
         struct backing_dev_info *backing_dev_info;
 
         struct io_context *io_context;
 
         unsigned long ptrace_message;
         siginfo_t *last_siginfo; /* For ptrace use.  */
 #ifdef CONFIG_TASK_XACCT
 /* i/o counters(bytes read/written, #syscalls */
         u64 rchar, wchar, syscr, syscw;
 #endif
         struct task_io_accounting ioac;
 #if defined(CONFIG_TASK_XACCT)
         u64 acct_rss_mem1;      /* accumulated rss usage */
         u64 acct_vm_mem1;       /* accumulated virtual memory usage */
         cputime_t acct_stimexpd;/* stime since last update */
 #endif
 #ifdef CONFIG_NUMA
         struct mempolicy *mempolicy;
         short il_next;
 #endif
 #ifdef CONFIG_CPUSETS
         nodemask_t mems_allowed;
         int cpuset_mems_generation;
         int cpuset_mem_spread_rotor;
 #endif
 #ifdef CONFIG_CGROUPS
         /* Control Group info protected by css_set_lock */
         struct css_set *cgroups;
         /* cg_list protected by css_set_lock and tsk->alloc_lock */
         struct list_head cg_list;
 #endif
 #ifdef CONFIG_FUTEX
         struct robust_list_head __user *robust_list;
 #ifdef CONFIG_COMPAT
         struct compat_robust_list_head __user *compat_robust_list;
 #endif
         struct list_head pi_state_list;
         struct futex_pi_state *pi_state_cache;
 #endif
         atomic_t fs_excl;       /* holding fs exclusive resources */
         struct rcu_head rcu;
 
         /*
          * cache last used pipe for splice
          */
         struct pipe_inode_info *splice_pipe;
 #ifdef  CONFIG_TASK_DELAY_ACCT
         struct task_delay_info *delays;
 #endif
 #ifdef CONFIG_FAULT_INJECTION
         int make_it_fail;
 #endif
         struct prop_local_single dirties;
 #ifdef CONFIG_LATENCYTOP
         int latency_record_count;
         struct latency_record latency_record[LT_SAVECOUNT];
 #endif
 #ifdef CONFIG_PREEMPT_RT
         /*
          * Temporary hack, until we find a solution to
          * handle printk in atomic operations.
          */
         int in_printk;
 #endif
 };
 
 #ifdef CONFIG_PREEMPT_RT
 # define set_printk_might_sleep(x) do { current->in_printk = x; } while(0)
 #else
 # define set_printk_might_sleep(x) do { } while(0)
 #endif
 
 #include <linux/sched_prio.h>
 
 static inline int rt_prio(int prio)
 {
         if (unlikely(prio < MAX_RT_PRIO))
                 return 1;
         return 0;
 }
 
 static inline int rt_task(struct task_struct *p)
 {
         return rt_prio(p->prio);
 }
 
 static inline void set_task_session(struct task_struct *tsk, pid_t session)
 {
         tsk->signal->__session = session;
 }
 
 static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp)
 {
         tsk->signal->__pgrp = pgrp;
 }
 
 static inline struct pid *task_pid(struct task_struct *task)
 {
         return task->pids[PIDTYPE_PID].pid;
 }
 
 static inline struct pid *task_tgid(struct task_struct *task)
 {
         return task->group_leader->pids[PIDTYPE_PID].pid;
 }
 
 static inline struct pid *task_pgrp(struct task_struct *task)
 {
         return task->group_leader->pids[PIDTYPE_PGID].pid;
 }
 
 static inline struct pid *task_session(struct task_struct *task)
 {
         return task->group_leader->pids[PIDTYPE_SID].pid;
 }
 
 struct pid_namespace;
 
 /*
  * the helpers to get the task's different pids as they are seen
  * from various namespaces
  *
  * task_xid_nr()     : global id, i.e. the id seen from the init namespace;
  * task_xid_vnr()    : virtual id, i.e. the id seen from the pid namespace of
  *                     current.
  * task_xid_nr_ns()  : id seen from the ns specified;
  *
  * set_task_vxid()   : assigns a virtual id to a task;
  *
  * see also pid_nr() etc in include/linux/pid.h
  */
 
 static inline pid_t task_pid_nr(struct task_struct *tsk)
 {
         return tsk->pid;
 }
 
 pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
 
 static inline pid_t task_pid_vnr(struct task_struct *tsk)
 {
         return pid_vnr(task_pid(tsk));
 }
 
 
 static inline pid_t task_tgid_nr(struct task_struct *tsk)
 {
         return tsk->tgid;
 }
 
 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
 
 static inline pid_t task_tgid_vnr(struct task_struct *tsk)
 {
         return pid_vnr(task_tgid(tsk));
 }
 
 
 static inline pid_t task_pgrp_nr(struct task_struct *tsk)
 {
         return tsk->signal->__pgrp;
 }
 
 pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
 
 static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
 {
         return pid_vnr(task_pgrp(tsk));
 }
 
 
 static inline pid_t task_session_nr(struct task_struct *tsk)
 {
         return tsk->signal->__session;
 }
 
 pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
 
 static inline pid_t task_session_vnr(struct task_struct *tsk)
 {
         return pid_vnr(task_session(tsk));
 }
 
 
 /**
  * pid_alive - check that a task structure is not stale
  * @p: Task structure to be checked.
  *
  * Test if a process is not yet dead (at most zombie state)
  * If pid_alive fails, then pointers within the task structure
  * can be stale and must not be dereferenced.
  */
 static inline int pid_alive(struct task_struct *p)
 {
         return p->pids[PIDTYPE_PID].pid != NULL;
 }
 
 /**
  * is_global_init - check if a task structure is init
  * @tsk: Task structure to be checked.
  *
  * Check if a task structure is the first user space task the kernel created.
  */
 static inline int is_global_init(struct task_struct *tsk)
 {
         return tsk->pid == 1;
 }
 
 /*
  * is_container_init:
  * check whether in the task is init in its own pid namespace.
  */
 extern int is_container_init(struct task_struct *tsk);
 
 extern struct pid *cad_pid;
 
 extern void free_task(struct task_struct *tsk);
 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
 
 #ifdef CONFIG_PREEMPT_RT
 extern void __put_task_struct_cb(struct rcu_head *rhp);
 
 static inline void put_task_struct(struct task_struct *t)
 {
         if (atomic_dec_and_test(&t->usage))
                 call_rcu(&t->rcu, __put_task_struct_cb);
 }
 #else
 extern void __put_task_struct(struct task_struct *t);
 
 static inline void put_task_struct(struct task_struct *t)
 {
         if (atomic_dec_and_test(&t->usage))
                 __put_task_struct(t);
 }
 #endif
 
 /*
  * Per process flags
  */
 #define PF_ALIGNWARN    0x00000001      /* Print alignment warning msgs */
                                         /* Not implemented yet, only for 486*/
 #define PF_STARTING     0x00000002      /* being created */
 #define PF_EXITING      0x00000004      /* getting shut down */
 #define PF_EXITPIDONE   0x00000008      /* pi exit done on shut down */
 #define PF_VCPU         0x00000010      /* I'm a virtual CPU */
 #define PF_NOSCHED      0x00000020      /* Userspace does not expect scheduling */
 #define PF_FORKNOEXEC   0x00000040      /* forked but didn't exec */
 #define PF_SUPERPRIV    0x00000100      /* used super-user privileges */
 #define PF_DUMPCORE     0x00000200      /* dumped core */
 #define PF_SIGNALED     0x00000400      /* killed by a signal */
 #define PF_MEMALLOC     0x00000800      /* Allocating memory */
 #define PF_FLUSHER      0x00001000      /* responsible for disk writeback */
 #define PF_USED_MATH    0x00002000      /* if unset the fpu must be initialized before use */
 #define PF_KMAP         0x00004000      /* this context has a kmap */
 #define PF_NOFREEZE     0x00008000      /* this thread should not be frozen */
 #define PF_FROZEN       0x00010000      /* frozen for system suspend */
 #define PF_FSTRANS      0x00020000      /* inside a filesystem transaction */
 #define PF_KSWAPD       0x00040000      /* I am kswapd */
 #define PF_SWAPOFF      0x00080000      /* I am in swapoff */
 #define PF_LESS_THROTTLE 0x00100000     /* Throttle me less: I clean memory */
 #define PF_BORROWED_MM  0x00200000      /* I am a kthread doing use_mm */
 #define PF_RANDOMIZE    0x00400000      /* randomize virtual address space */
 #define PF_SWAPWRITE    0x00800000      /* Allowed to write to swap */
 #define PF_SPREAD_PAGE  0x01000000      /* Spread page cache over cpuset */
 #define PF_SPREAD_SLAB  0x02000000      /* Spread some slab caches over cpuset */
 #define PF_SOFTIRQ      0x04000000      /* softirq context */
 #define PF_HARDIRQ      0x08000000      /* hardirq context */
 #define PF_MEMPOLICY    0x10000000      /* Non-default NUMA mempolicy */
 #define PF_MUTEX_TESTER 0x20000000      /* Thread belongs to the rt mutex tester */
 #define PF_FREEZER_SKIP 0x40000000      /* Freezer should not count it as freezeable */
 
 /*
  * Only the _current_ task can read/write to tsk->flags, but other
  * tasks can access tsk->flags in readonly mode for example
  * with tsk_used_math (like during threaded core dumping).
  * There is however an exception to this rule during ptrace
  * or during fork: the ptracer task is allowed to write to the
  * child->flags of its traced child (same goes for fork, the parent
  * can write to the child->flags), because we're guaranteed the
  * child is not running and in turn not changing child->flags
  * at the same time the parent does it.
  */
 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
 #define clear_used_math() clear_stopped_child_used_math(current)
 #define set_used_math() set_stopped_child_used_math(current)
 #define conditional_stopped_child_used_math(condition, child) \
         do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
 #define conditional_used_math(condition) \
         conditional_stopped_child_used_math(condition, current)
 #define copy_to_stopped_child_used_math(child) \
         do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
 #define used_math() tsk_used_math(current)
 
 #ifdef CONFIG_SMP
 extern int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask);
 #else
 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
 {
         if (!cpu_isset(0, new_mask))
                 return -EINVAL;
         return 0;
 }
 #endif
 
 extern unsigned long long sched_clock(void);
 
 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
 static inline void sched_clock_init(void)
 {
 }
 
 static inline u64 sched_clock_cpu(int cpu)
 {
         return sched_clock();
 }
 
 static inline void sched_clock_tick(void)
 {
 }
 
 static inline void sched_clock_idle_sleep_event(void)
 {
 }
 
 static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
 {
 }
 #else
 extern void sched_clock_init(void);
 extern u64 sched_clock_cpu(int cpu);
 extern void sched_clock_tick(void);
 extern void sched_clock_idle_sleep_event(void);
 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
 #endif
 
 /*
  * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
  * clock constructed from sched_clock():
  */
 extern unsigned long long cpu_clock(int cpu);
 
 extern unsigned long long
 task_sched_runtime(struct task_struct *task);
 
 /* sched_exec is called by processes performing an exec */
 #ifdef CONFIG_SMP
 extern void sched_exec(void);
 #else
 #define sched_exec()   {}
 #endif
 
 extern void sched_clock_idle_sleep_event(void);
 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
 
 #ifdef CONFIG_HOTPLUG_CPU
 extern void idle_task_exit(void);
 #else
 static inline void idle_task_exit(void) {}
 #endif
 
 extern void sched_idle_next(void);
 
 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
 extern void wake_up_idle_cpu(int cpu);
 #else
 static inline void wake_up_idle_cpu(int cpu) { }
 #endif
 
 #ifdef CONFIG_SCHED_DEBUG
 extern unsigned int sysctl_sched_latency;
 extern unsigned int sysctl_sched_min_granularity;
 extern unsigned int sysctl_sched_wakeup_granularity;
 extern unsigned int sysctl_sched_batch_wakeup_granularity;
 extern unsigned int sysctl_sched_child_runs_first;
 extern unsigned int sysctl_sched_features;
 extern unsigned int sysctl_sched_migration_cost;
 extern unsigned int sysctl_sched_nr_migrate;
 
 int sched_nr_latency_handler(struct ctl_table *table, int write,
                 struct file *file, void __user *buffer, size_t *length,
                 loff_t *ppos);
 #endif
 extern unsigned int sysctl_sched_rt_period;
 extern int sysctl_sched_rt_runtime;
 
 extern unsigned int sysctl_sched_compat_yield;
 
 extern void task_setprio(struct task_struct *p, int prio);
 
 #ifdef CONFIG_RT_MUTEXES
 extern int rt_mutex_getprio(struct task_struct *p);
 static inline void rt_mutex_setprio(struct task_struct *p, int prio)
 {
         task_setprio(p, prio);
 }
 extern void rt_mutex_adjust_pi(struct task_struct *p);
 #else
 static inline int rt_mutex_getprio(struct task_struct *p)
 {
         return p->normal_prio;
 }
 # define rt_mutex_adjust_pi(p)          do { } while (0)
 #endif
 
 extern void set_user_nice(struct task_struct *p, long nice);
 extern int task_prio(const struct task_struct *p);
 extern int task_nice(const struct task_struct *p);
 extern int can_nice(const struct task_struct *p, const int nice);
 extern int task_curr(const struct task_struct *p);
 extern int idle_cpu(int cpu);
 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
 extern struct task_struct *idle_task(int cpu);
 extern struct task_struct *curr_task(int cpu);
 extern void set_curr_task(int cpu, struct task_struct *p);
 
 void yield(void);
 void __yield(void);
 
 /*
  * The default (Linux) execution domain.
  */
 extern struct exec_domain       default_exec_domain;
 
 union thread_union {
         struct thread_info thread_info;
         unsigned long stack[THREAD_SIZE/sizeof(long)];
 };
 
 #ifndef __HAVE_ARCH_KSTACK_END
 static inline int kstack_end(void *addr)
 {
         /* Reliable end of stack detection:
          * Some APM bios versions misalign the stack
          */
         return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
 }
 #endif
 
 extern union thread_union init_thread_union;
 extern struct task_struct init_task;
 
 extern struct   mm_struct init_mm;
 
 extern struct pid_namespace init_pid_ns;
 
 /*
  * find a task by one of its numerical ids
  *
  * find_task_by_pid_type_ns():
  *      it is the most generic call - it finds a task by all id,
  *      type and namespace specified
  * find_task_by_pid_ns():
  *      finds a task by its pid in the specified namespace
  * find_task_by_vpid():
  *      finds a task by its virtual pid
  * find_task_by_pid():
  *      finds a task by its global pid
  *
  * see also find_pid() etc in include/linux/pid.h
  */
 
 extern struct task_struct *find_task_by_pid_type_ns(int type, int pid,
                 struct pid_namespace *ns);
 
 extern struct task_struct *find_task_by_pid(pid_t nr);
 extern struct task_struct *find_task_by_vpid(pid_t nr);
 extern struct task_struct *find_task_by_pid_ns(pid_t nr,
                 struct pid_namespace *ns);
 
 extern void __set_special_pids(struct pid *pid);
 
 /* per-UID process charging. */
 extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
 static inline struct user_struct *get_uid(struct user_struct *u)
 {
         atomic_inc(&u->__count);
         return u;
 }
 extern void free_uid(struct user_struct *);
 extern void switch_uid(struct user_struct *);
 extern void release_uids(struct user_namespace *ns);
 
 #include <asm/current.h>
 
 extern void do_timer(unsigned long ticks);
 
 extern int wake_up_state(struct task_struct *tsk, unsigned int state);
 extern int wake_up_process(struct task_struct *tsk);
 extern int wake_up_process_mutex(struct task_struct * tsk);
 extern int wake_up_process_sync(struct task_struct * tsk);
 extern int wake_up_process_mutex_sync(struct task_struct * tsk);
 extern void wake_up_new_task(struct task_struct *tsk,
                                 unsigned long clone_flags);
 #ifdef CONFIG_SMP
  extern void kick_process(struct task_struct *tsk);
 #else
  static inline void kick_process(struct task_struct *tsk) { }
 #endif
 extern void sched_fork(struct task_struct *p, int clone_flags);
 extern void sched_dead(struct task_struct *p);
 
 extern int in_group_p(gid_t);
 extern int in_egroup_p(gid_t);
 
 extern void proc_caches_init(void);
 extern void flush_signals(struct task_struct *);
 extern void ignore_signals(struct task_struct *);
 extern void flush_signal_handlers(struct task_struct *, int force_default);
 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
 
 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
 {
         unsigned long flags;
         int ret;
 
         spin_lock_irqsave(&tsk->sighand->siglock, flags);
         ret = dequeue_signal(tsk, mask, info);
         spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
 
         return ret;
 }       
 
 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
                               sigset_t *mask);
 extern void unblock_all_signals(void);
 extern void release_task(struct task_struct * p);
 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
 extern int force_sigsegv(int, struct task_struct *);
 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
 extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
 extern int kill_pgrp(struct pid *pid, int sig, int priv);
 extern int kill_pid(struct pid *pid, int sig, int priv);
 extern int kill_proc_info(int, struct siginfo *, pid_t);
 extern void do_notify_parent(struct task_struct *, int);
 extern void force_sig(int, struct task_struct *);
 extern void force_sig_specific(int, struct task_struct *);
 extern int send_sig(int, struct task_struct *, int);
 extern void zap_other_threads(struct task_struct *p);
 extern int kill_proc(pid_t, int, int);
 extern struct sigqueue *sigqueue_alloc(void);
 extern void sigqueue_free(struct sigqueue *);
 extern int send_sigqueue(int, struct sigqueue *,  struct task_struct *);
 extern int send_group_sigqueue(int, struct sigqueue *,  struct task_struct *);
 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
 
 static inline int kill_cad_pid(int sig, int priv)
 {
         return kill_pid(cad_pid, sig, priv);
 }
 
 /* These can be the second arg to send_sig_info/send_group_sig_info.  */
 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
 #define SEND_SIG_PRIV   ((struct siginfo *) 1)
 #define SEND_SIG_FORCED ((struct siginfo *) 2)
 
 static inline int is_si_special(const struct siginfo *info)
 {
         return info <= SEND_SIG_FORCED;
 }
 
 /* True if we are on the alternate signal stack.  */
 
 static inline int on_sig_stack(unsigned long sp)
 {
         return (sp - current->sas_ss_sp < current->sas_ss_size);
 }
 
 static inline int sas_ss_flags(unsigned long sp)
 {
         return (current->sas_ss_size == 0 ? SS_DISABLE
                 : on_sig_stack(sp) ? SS_ONSTACK : 0);
 }
 
 /*
  * Routines for handling mm_structs
  */
 extern struct mm_struct * mm_alloc(void);
 
 /* mmdrop drops the mm and the page tables */
 extern void __mmdrop(struct mm_struct *);
 extern void __mmdrop_delayed(struct mm_struct *);
 
 static inline void mmdrop(struct mm_struct * mm)
 {
         if (unlikely(atomic_dec_and_test(&mm->mm_count)))
                 __mmdrop(mm);
 }
 
 static inline void mmdrop_delayed(struct mm_struct * mm)
 {
         if (atomic_dec_and_test(&mm->mm_count))
                 __mmdrop_delayed(mm);
 }
 
 /* mmput gets rid of the mappings and all user-space */
 extern void mmput(struct mm_struct *);
 /* Grab a reference to a task's mm, if it is not already going away */
 extern struct mm_struct *get_task_mm(struct task_struct *task);
 /* Remove the current tasks stale references to the old mm_struct */
 extern void mm_release(struct task_struct *, struct mm_struct *);
 
 extern int  copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
 extern void flush_thread(void);
 extern void exit_thread(void);
 
 extern void exit_files(struct task_struct *);
 extern void __cleanup_signal(struct signal_struct *);
 extern void __cleanup_sighand(struct sighand_struct *);
 extern void exit_itimers(struct signal_struct *);
 
 extern NORET_TYPE void do_group_exit(int);
 
 extern void daemonize(const char *, ...);
 extern int allow_signal(int);
 extern int disallow_signal(int);
 
 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
 struct task_struct *fork_idle(int);
 
 extern void set_task_comm(struct task_struct *tsk, char *from);
 extern char *get_task_comm(char *to, struct task_struct *tsk);
 
 #ifdef CONFIG_SMP
 extern void wait_task_inactive(struct task_struct * p);
 #else
 #define wait_task_inactive(p)   do { } while (0)
 #endif
 
 #define remove_parent(p)        list_del_init(&(p)->sibling)
 #define add_parent(p)           list_add_tail(&(p)->sibling,&(p)->parent->children)
 
 #define next_task(p)    list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
 
 #define for_each_process(p) \
         for (p = &init_task ; (p = next_task(p)) != &init_task ; )
 
 /*
  * Careful: do_each_thread/while_each_thread is a double loop so
  *          'break' will not work as expected - use goto instead.
  */
 #define do_each_thread(g, t) \
         for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
 
 #define while_each_thread(g, t) \
         while ((t = next_thread(t)) != g)
 
 /* de_thread depends on thread_group_leader not being a pid based check */
 #define thread_group_leader(p)  (p == p->group_leader)
 
 /* Do to the insanities of de_thread it is possible for a process
  * to have the pid of the thread group leader without actually being
  * the thread group leader.  For iteration through the pids in proc
  * all we care about is that we have a task with the appropriate
  * pid, we don't actually care if we have the right task.
  */
 static inline int has_group_leader_pid(struct task_struct *p)
 {
         return p->pid == p->tgid;
 }
 
 static inline
 int same_thread_group(struct task_struct *p1, struct task_struct *p2)
 {
         return p1->tgid == p2->tgid;
 }
 
 static inline struct task_struct *next_thread(const struct task_struct *p)
 {
         return list_entry(rcu_dereference(p->thread_group.next),
                           struct task_struct, thread_group);
 }
 
 static inline int thread_group_empty(struct task_struct *p)
 {
         return list_empty(&p->thread_group);
 }
 
 #define delay_group_leader(p) \
                 (thread_group_leader(p) && !thread_group_empty(p))
 
 /*
  * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
  * subscriptions and synchronises with wait4().  Also used in procfs.  Also
  * pins the final release of task.io_context.  Also protects ->cpuset and
  * ->cgroup.subsys[].
  *
  * Nests both inside and outside of read_lock(&tasklist_lock).
  * It must not be nested with write_lock_irq(&tasklist_lock),
  * neither inside nor outside.
  */
 static inline void task_lock(struct task_struct *p)
 {
         spin_lock(&p->alloc_lock);
 }
 
 static inline void task_unlock(struct task_struct *p)
 {
         spin_unlock(&p->alloc_lock);
 }
 
 extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
                                                         unsigned long *flags);
 
 static inline void unlock_task_sighand(struct task_struct *tsk,
                                                 unsigned long *flags)
 {
         spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
 }
 
 #ifndef __HAVE_THREAD_FUNCTIONS
 
 #define task_thread_info(task)  ((struct thread_info *)(task)->stack)
 #define task_stack_page(task)   ((task)->stack)
 
 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
 {
         *task_thread_info(p) = *task_thread_info(org);
         task_thread_info(p)->task = p;
 }
 
 static inline unsigned long *end_of_stack(struct task_struct *p)
 {
         return (unsigned long *)(task_thread_info(p) + 1);
 }
 
 #endif
 
 /* set thread flags in other task's structures
  * - see asm/thread_info.h for TIF_xxxx flags available
  */
 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
 {
         set_ti_thread_flag(task_thread_info(tsk), flag);
 }
 
 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
 {
         clear_ti_thread_flag(task_thread_info(tsk), flag);
 }
 
 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
 {
         return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
 }
 
 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
 {
         return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
 }
 
 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
 {
         return test_ti_thread_flag(task_thread_info(tsk), flag);
 }
 
 static inline void set_tsk_need_resched(struct task_struct *tsk)
 {
         set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
 }
 
 static inline void clear_tsk_need_resched(struct task_struct *tsk)
 {
         clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
 }
 
 static inline int test_tsk_need_resched(struct task_struct *tsk)
 {
         return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
 }
 
 static inline int signal_pending(struct task_struct *p)
 {
         return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
 }
 
 extern int __fatal_signal_pending(struct task_struct *p);
 
 static inline int fatal_signal_pending(struct task_struct *p)
 {
         return signal_pending(p) && __fatal_signal_pending(p);
 }
 
 static inline int _need_resched(void)
 {
         return unlikely(test_tsk_need_resched(current));
 }
 
 static inline int need_resched(void)
 {
         return _need_resched();
 }
 
 static inline void set_tsk_need_resched_delayed(struct task_struct *tsk)
 {
         set_tsk_thread_flag(tsk,TIF_NEED_RESCHED_DELAYED);
 }
 
 static inline void clear_tsk_need_resched_delayed(struct task_struct *tsk)
 {
         clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED_DELAYED);
 }
 
 static inline int need_resched_delayed(void)
 {
         return unlikely(test_thread_flag(TIF_NEED_RESCHED_DELAYED));
 }
 
 /*
  * cond_resched() and cond_resched_lock(): latency reduction via
  * explicit rescheduling in places that are safe. The return
  * value indicates whether a reschedule was done in fact.
  * cond_resched_lock() will drop the spinlock before scheduling,
  * cond_resched_softirq() will enable bhs before scheduling.
  */
 #ifdef CONFIG_PREEMPT
 static inline int cond_resched(void)
 {
         return 0;
 }
 #else
 extern int _cond_resched(void);
 static inline int cond_resched(void)
 {
         return _cond_resched();
 }
 #endif
 extern int __cond_resched_raw_spinlock(raw_spinlock_t *lock);
 extern int __cond_resched_spinlock(spinlock_t *spinlock);
 
 #define cond_resched_lock(lock) \
         PICK_SPIN_OP_RET(__cond_resched_raw_spinlock, __cond_resched_spinlock,\
                  lock)
 
 extern int cond_resched_softirq(void);
 extern int cond_resched_softirq_context(void);
 extern int cond_resched_hardirq_context(void);
 
 /*
  * Does a critical section need to be broken due to another
  * task waiting?: (technically does not depend on CONFIG_PREEMPT,
  * but a general need for low latency)
  */
 static inline int __raw_spin_needbreak(raw_spinlock_t *lock)
 {
 #ifdef CONFIG_PREEMPT
         return spin_is_contended(lock);
 #else
         return 0;
 #endif
 }
 
 #ifdef CONFIG_PREEMPT_RT
 static inline int __spin_needbreak(spinlock_t *lock)
 {
         return lock->break_lock;
 }
 #else
 static inline int __spin_needbreak(spinlock_t *lock)
 {
         /* should never be call outside of RT */
         BUG();
         return 0;
 }
 #endif
 
 #define spin_needbreak(lock) \
         PICK_SPIN_OP_RET(__raw_spin_needbreak, __spin_needbreak, lock)
 
 static inline int softirq_need_resched(void)
 {
         if (softirq_preemption && (current->flags & PF_SOFTIRQ))
                 return need_resched();
         return 0;
 }
 
 static inline int hardirq_need_resched(void)
 {
         if (hardirq_preemption && (current->flags & PF_HARDIRQ))
                 return need_resched();
         return 0;
 }
 
 /*
  * Reevaluate whether the task has signals pending delivery.
  * Wake the task if so.
  * This is required every time the blocked sigset_t changes.
  * callers must hold sighand->siglock.
  */
 extern void recalc_sigpending_and_wake(struct task_struct *t);
 extern void recalc_sigpending(void);
 
 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
 
 /*
  * Wrappers for p->thread_info->cpu access. No-op on UP.
  */
 #ifdef CONFIG_SMP
 
 static inline unsigned int task_cpu(const struct task_struct *p)
 {
         return task_thread_info(p)->cpu;
 }
 
 extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
 
 #else
 
 static inline unsigned int task_cpu(const struct task_struct *p)
 {
         return 0;
 }
 
 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
 {
 }
 
 #endif /* CONFIG_SMP */
 
 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 extern void arch_pick_mmap_layout(struct mm_struct *mm);
 #else
 static inline void arch_pick_mmap_layout(struct mm_struct *mm)
 {
         mm->mmap_base = TASK_UNMAPPED_BASE;
         mm->get_unmapped_area = arch_get_unmapped_area;
         mm->unmap_area = arch_unmap_area;
 }
 #endif
 
 #ifdef CONFIG_TRACING
 extern void
 __trace_special(void *__tr, void *__data,
                 unsigned long arg1, unsigned long arg2, unsigned long arg3);
 #else
 static inline void
 __trace_special(void *__tr, void *__data,
                 unsigned long arg1, unsigned long arg2, unsigned long arg3)
 {
 }
 #endif
 
 extern long sched_setaffinity(pid_t pid, cpumask_t new_mask);
 extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
 
 extern int sched_mc_power_savings, sched_smt_power_savings;
 
 extern void normalize_rt_tasks(void);
 
 #ifdef CONFIG_GROUP_SCHED
 
 extern struct task_group init_task_group;
 
 extern struct task_group *sched_create_group(void);
 extern void sched_destroy_group(struct task_group *tg);
 extern void sched_move_task(struct task_struct *tsk);
 #ifdef CONFIG_FAIR_GROUP_SCHED
 extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
 extern unsigned long sched_group_shares(struct task_group *tg);
 #endif
 #ifdef CONFIG_RT_GROUP_SCHED
 extern int sched_group_set_rt_runtime(struct task_group *tg,
                                       long rt_runtime_us);
 extern long sched_group_rt_runtime(struct task_group *tg);
 #endif
 #endif
 
 #ifdef CONFIG_TASK_XACCT
 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
 {
         tsk->rchar += amt;
 }
 
 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
 {
         tsk->wchar += amt;
 }
 
 static inline void inc_syscr(struct task_struct *tsk)
 {
         tsk->syscr++;
 }
 
 static inline void inc_syscw(struct task_struct *tsk)
 {
         tsk->syscw++;
 }
 #else
 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
 {
 }
 
 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
 {
 }
 
 static inline void inc_syscr(struct task_struct *tsk)
 {
 }
 
 static inline void inc_syscw(struct task_struct *tsk)
 {
 }
 #endif
 
 #ifdef CONFIG_PREEMPT_TRACE
 void print_preempt_trace(struct task_struct *tsk);
 #else
 # define print_preempt_trace(tsk) do { } while (0)
 #endif
 
 #ifdef CONFIG_SMP
 void migration_init(void);
 #else
 static inline void migration_init(void)
 {
 }
 #endif
 
 #ifndef TASK_SIZE_OF
 #define TASK_SIZE_OF(tsk)       TASK_SIZE
 #endif
 
 #ifdef CONFIG_SMP
 static inline int task_is_current(struct task_struct *task)
 {
         return task->oncpu;
 }
 #endif
 
 #define TASK_STATE_TO_CHAR_STR "RMSDTtZX"
 
 #endif /* __KERNEL__ */
 
 #endif