6 #define MREMAP_MAYMOVE 1
9 #define OVERCOMMIT_GUESS 0
10 #define OVERCOMMIT_ALWAYS 1
11 #define OVERCOMMIT_NEVER 2
14 #include <linux/config.h>
17 #include <asm/atomic.h>
19 extern int sysctl_overcommit_memory;
20 extern int sysctl_overcommit_ratio;
21 extern atomic_t vm_committed_space;
24 extern void vm_acct_memory(long pages);
26 static inline void vm_acct_memory(long pages)
28 atomic_add(pages, &vm_committed_space);
32 static inline void vm_unacct_memory(long pages)
34 vm_acct_memory(-pages);
38 * Optimisation macro. It is equivalent to:
39 * (x & bit1) ? bit2 : 0
40 * but this version is faster.
41 * ("bit1" and "bit2" must be single bits)
43 #define _calc_vm_trans(x, bit1, bit2) \
44 ((bit1) <= (bit2) ? ((x) & (bit1)) * ((bit2) / (bit1)) \
45 : ((x) & (bit1)) / ((bit1) / (bit2)))
48 * Combine the mmap "prot" argument into "vm_flags" used internally.
50 static inline unsigned long
51 calc_vm_prot_bits(unsigned long prot)
53 return _calc_vm_trans(prot, PROT_READ, VM_READ ) |
54 _calc_vm_trans(prot, PROT_WRITE, VM_WRITE) |
55 _calc_vm_trans(prot, PROT_EXEC, VM_EXEC );
59 * Combine the mmap "flags" argument into "vm_flags" used internally.
61 static inline unsigned long
62 calc_vm_flag_bits(unsigned long flags)
64 return _calc_vm_trans(flags, MAP_GROWSDOWN, VM_GROWSDOWN ) |
65 _calc_vm_trans(flags, MAP_DENYWRITE, VM_DENYWRITE ) |
66 _calc_vm_trans(flags, MAP_EXECUTABLE, VM_EXECUTABLE) |
67 _calc_vm_trans(flags, MAP_LOCKED, VM_LOCKED );
69 #endif /* __KERNEL__ */
70 #endif /* _LINUX_MMAN_H */