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