projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 */ |