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1da177e4 LT |
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 */ |