1#ifndef _LINUX_MMAN_H
2#define _LINUX_MMAN_H
3
4#include <linux/mm.h>
5#include <linux/percpu_counter.h>
6
7#include <linux/atomic.h>
8#include <uapi/linux/mman.h>
9
10extern int sysctl_overcommit_memory;
11extern int sysctl_overcommit_ratio;
12extern unsigned long sysctl_overcommit_kbytes;
13extern struct percpu_counter vm_committed_as;
14
15#ifdef CONFIG_SMP
16extern s32 vm_committed_as_batch;
17#else
18#define vm_committed_as_batch 0
19#endif
20
21unsigned long vm_memory_committed(void);
22
23static inline void vm_acct_memory(long pages)
24{
25 __percpu_counter_add(&vm_committed_as, pages, vm_committed_as_batch);
26}
27
28static inline void vm_unacct_memory(long pages)
29{
30 vm_acct_memory(-pages);
31}
32
33
34
35
36
37#ifndef arch_calc_vm_prot_bits
38#define arch_calc_vm_prot_bits(prot, pkey) 0
39#endif
40
41#ifndef arch_vm_get_page_prot
42#define arch_vm_get_page_prot(vm_flags) __pgprot(0)
43#endif
44
45#ifndef arch_validate_prot
46
47
48
49
50
51
52static inline bool arch_validate_prot(unsigned long prot)
53{
54 return (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM)) == 0;
55}
56#define arch_validate_prot arch_validate_prot
57#endif
58
59
60
61
62
63
64
65#define _calc_vm_trans(x, bit1, bit2) \
66 ((bit1) <= (bit2) ? ((x) & (bit1)) * ((bit2) / (bit1)) \
67 : ((x) & (bit1)) / ((bit1) / (bit2)))
68
69
70
71
72static inline unsigned long
73calc_vm_prot_bits(unsigned long prot, unsigned long pkey)
74{
75 return _calc_vm_trans(prot, PROT_READ, VM_READ ) |
76 _calc_vm_trans(prot, PROT_WRITE, VM_WRITE) |
77 _calc_vm_trans(prot, PROT_EXEC, VM_EXEC) |
78 arch_calc_vm_prot_bits(prot, pkey);
79}
80
81
82
83
84static inline unsigned long
85calc_vm_flag_bits(unsigned long flags)
86{
87 return _calc_vm_trans(flags, MAP_GROWSDOWN, VM_GROWSDOWN ) |
88 _calc_vm_trans(flags, MAP_DENYWRITE, VM_DENYWRITE ) |
89 _calc_vm_trans(flags, MAP_LOCKED, VM_LOCKED );
90}
91
92unsigned long vm_commit_limit(void);
93#endif
94