1 #ifndef _LINUX_MMAN_H
2 #define _LINUX_MMAN_H
3
4 #include <asm/mman.h>
5
6 #define MREMAP_MAYMOVE 1
7 #define MREMAP_FIXED 2
8
9 #define OVERCOMMIT_GUESS 0
10 #define OVERCOMMIT_ALWAYS 1
11 #define OVERCOMMIT_NEVER 2
12
13 #ifdef __KERNEL__
14 #include <linux/mm.h>
15
16 #include <asm/atomic.h>
17
18 extern int sysctl_overcommit_memory;
19 extern int sysctl_overcommit_ratio;
20 extern atomic_t vm_committed_space;
21
22 #ifdef CONFIG_SMP
23 extern void vm_acct_memory(long pages);
24 #else
25 static inline void vm_acct_memory(long pages)
26 {
27 atomic_add(pages, &vm_committed_space);
28 }
29 #endif
30
31 static inline void vm_unacct_memory(long pages)
32 {
33 vm_acct_memory(-pages);
34 }
35
36 /*
37 * Optimisation macro. It is equivalent to:
38 * (x & bit1) ? bit2 : 0
39 * but this version is faster.
40 * ("bit1" and "bit2" must be single bits)
41 */
42 #define _calc_vm_trans(x, bit1, bit2) \
43 ((bit1) <= (bit2) ? ((x) & (bit1)) * ((bit2) / (bit1)) \
44 : ((x) & (bit1)) / ((bit1) / (bit2)))
45
46 /*
47 * Combine the mmap "prot" argument into "vm_flags" used internally.
48 */
49 static inline unsigned long
50 calc_vm_prot_bits(unsigned long prot)
51 {
52 return _calc_vm_trans(prot, PROT_READ, VM_READ ) |
53 _calc_vm_trans(prot, PROT_WRITE, VM_WRITE) |
54 _calc_vm_trans(prot, PROT_EXEC, VM_EXEC );
55 }
56
57 /*
58 * Combine the mmap "flags" argument into "vm_flags" used internally.
59 */
60 static inline unsigned long
61 calc_vm_flag_bits(unsigned long flags)
62 {
63 return _calc_vm_trans(flags, MAP_GROWSDOWN, VM_GROWSDOWN ) |
64 _calc_vm_trans(flags, MAP_DENYWRITE, VM_DENYWRITE ) |
65 _calc_vm_trans(flags, MAP_EXECUTABLE, VM_EXECUTABLE) |
66 _calc_vm_trans(flags, MAP_LOCKED, VM_LOCKED );
67 }
68 #endif /* __KERNEL__ */
69 #endif /* _LINUX_MMAN_H */
70
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