1 /* SPDX-License-Identifier: GPL-2.0 */
6 #include <linux/percpu_counter.h>
8 #include <linux/atomic.h>
9 #include <uapi/linux/mman.h>
11 extern int sysctl_overcommit_memory
;
12 extern int sysctl_overcommit_ratio
;
13 extern unsigned long sysctl_overcommit_kbytes
;
14 extern struct percpu_counter vm_committed_as
;
17 extern s32 vm_committed_as_batch
;
19 #define vm_committed_as_batch 0
22 unsigned long vm_memory_committed(void);
24 static inline void vm_acct_memory(long pages
)
26 percpu_counter_add_batch(&vm_committed_as
, pages
, vm_committed_as_batch
);
29 static inline void vm_unacct_memory(long pages
)
31 vm_acct_memory(-pages
);
35 * Allow architectures to handle additional protection bits
38 #ifndef arch_calc_vm_prot_bits
39 #define arch_calc_vm_prot_bits(prot, pkey) 0
42 #ifndef arch_vm_get_page_prot
43 #define arch_vm_get_page_prot(vm_flags) __pgprot(0)
46 #ifndef arch_validate_prot
48 * This is called from mprotect(). PROT_GROWSDOWN and PROT_GROWSUP have
49 * already been masked out.
51 * Returns true if the prot flags are valid
53 static inline bool arch_validate_prot(unsigned long prot
)
55 return (prot
& ~(PROT_READ
| PROT_WRITE
| PROT_EXEC
| PROT_SEM
)) == 0;
57 #define arch_validate_prot arch_validate_prot
61 * Optimisation macro. It is equivalent to:
62 * (x & bit1) ? bit2 : 0
63 * but this version is faster.
64 * ("bit1" and "bit2" must be single bits)
66 #define _calc_vm_trans(x, bit1, bit2) \
67 ((bit1) <= (bit2) ? ((x) & (bit1)) * ((bit2) / (bit1)) \
68 : ((x) & (bit1)) / ((bit1) / (bit2)))
71 * Combine the mmap "prot" argument into "vm_flags" used internally.
73 static inline unsigned long
74 calc_vm_prot_bits(unsigned long prot
, unsigned long pkey
)
76 return _calc_vm_trans(prot
, PROT_READ
, VM_READ
) |
77 _calc_vm_trans(prot
, PROT_WRITE
, VM_WRITE
) |
78 _calc_vm_trans(prot
, PROT_EXEC
, VM_EXEC
) |
79 arch_calc_vm_prot_bits(prot
, pkey
);
83 * Combine the mmap "flags" argument into "vm_flags" used internally.
85 static inline unsigned long
86 calc_vm_flag_bits(unsigned long flags
)
88 return _calc_vm_trans(flags
, MAP_GROWSDOWN
, VM_GROWSDOWN
) |
89 _calc_vm_trans(flags
, MAP_DENYWRITE
, VM_DENYWRITE
) |
90 _calc_vm_trans(flags
, MAP_LOCKED
, VM_LOCKED
);
93 unsigned long vm_commit_limit(void);
94 #endif /* _LINUX_MMAN_H */