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)) ? 0 : \
68 ((bit1) <= (bit2) ? ((x) & (bit1)) * ((bit2) / (bit1)) \
69 : ((x) & (bit1)) / ((bit1) / (bit2))))
72 * Combine the mmap "prot" argument into "vm_flags" used internally.
74 static inline unsigned long
75 calc_vm_prot_bits(unsigned long prot, unsigned long pkey)
77 return _calc_vm_trans(prot, PROT_READ, VM_READ ) |
78 _calc_vm_trans(prot, PROT_WRITE, VM_WRITE) |
79 _calc_vm_trans(prot, PROT_EXEC, VM_EXEC) |
80 arch_calc_vm_prot_bits(prot, pkey);
84 * Combine the mmap "flags" argument into "vm_flags" used internally.
86 static inline unsigned long
87 calc_vm_flag_bits(unsigned long flags)
89 return _calc_vm_trans(flags, MAP_GROWSDOWN, VM_GROWSDOWN ) |
90 _calc_vm_trans(flags, MAP_DENYWRITE, VM_DENYWRITE ) |
91 _calc_vm_trans(flags, MAP_LOCKED, VM_LOCKED );
94 unsigned long vm_commit_limit(void);
95 #endif /* _LINUX_MMAN_H */