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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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C
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174/* SPDX-License-Identifier: GPL-2.0 */#ifndef _LINUX_MMAN_H#define _LINUX_MMAN_H
#include <linux/fs.h>#include <linux/mm.h>#include <linux/percpu_counter.h>
#include <linux/atomic.h>#include <uapi/linux/mman.h>
/* * Arrange for legacy / undefined architecture specific flags to be * ignored by mmap handling code. */#ifndef MAP_32BIT#define MAP_32BIT 0#endif#ifndef MAP_ABOVE4G#define MAP_ABOVE4G 0#endif#ifndef MAP_HUGE_2MB#define MAP_HUGE_2MB 0#endif#ifndef MAP_HUGE_1GB#define MAP_HUGE_1GB 0#endif#ifndef MAP_UNINITIALIZED#define MAP_UNINITIALIZED 0#endif#ifndef MAP_SYNC#define MAP_SYNC 0#endif
/* * The historical set of flags that all mmap implementations implicitly * support when a ->mmap_validate() op is not provided in file_operations. * * MAP_EXECUTABLE and MAP_DENYWRITE are completely ignored throughout the * kernel. */#define LEGACY_MAP_MASK (MAP_SHARED \ | MAP_PRIVATE \ | MAP_FIXED \ | MAP_ANONYMOUS \ | MAP_DENYWRITE \ | MAP_EXECUTABLE \ | MAP_UNINITIALIZED \ | MAP_GROWSDOWN \ | MAP_LOCKED \ | MAP_NORESERVE \ | MAP_POPULATE \ | MAP_NONBLOCK \ | MAP_STACK \ | MAP_HUGETLB \ | MAP_32BIT \ | MAP_ABOVE4G \ | MAP_HUGE_2MB \ | MAP_HUGE_1GB)
extern int sysctl_overcommit_memory;extern struct percpu_counter vm_committed_as;
#ifdef CONFIG_SMPextern s32 vm_committed_as_batch;extern void mm_compute_batch(int overcommit_policy);#else#define vm_committed_as_batch 0static inline void mm_compute_batch(int overcommit_policy){}#endif
unsigned long vm_memory_committed(void);
static inline void vm_acct_memory(long pages){ percpu_counter_add_batch(&vm_committed_as, pages, vm_committed_as_batch);}
static inline void vm_unacct_memory(long pages){ vm_acct_memory(-pages);}
/* * Allow architectures to handle additional protection and flag bits. The * overriding macros must be defined in the arch-specific asm/mman.h file. */
#ifndef arch_calc_vm_prot_bits#define arch_calc_vm_prot_bits(prot, pkey) 0#endif
#ifndef arch_calc_vm_flag_bits#define arch_calc_vm_flag_bits(file, flags) 0#endif
#ifndef arch_validate_prot/* * This is called from mprotect(). PROT_GROWSDOWN and PROT_GROWSUP have * already been masked out. * * Returns true if the prot flags are valid */static inline bool arch_validate_prot(unsigned long prot, unsigned long addr){ return (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM)) == 0;}#define arch_validate_prot arch_validate_prot#endif
#ifndef arch_validate_flags/* * This is called from mmap() and mprotect() with the updated vma->vm_flags. * * Returns true if the VM_* flags are valid. */static inline bool arch_validate_flags(unsigned long flags){ return true;}#define arch_validate_flags arch_validate_flags#endif
/* * Optimisation macro. It is equivalent to: * (x & bit1) ? bit2 : 0 * but this version is faster. * ("bit1" and "bit2" must be single bits) */#define _calc_vm_trans(x, bit1, bit2) \ ((!(bit1) || !(bit2)) ? 0 : \ ((bit1) <= (bit2) ? ((x) & (bit1)) * ((bit2) / (bit1)) \ : ((x) & (bit1)) / ((bit1) / (bit2))))
/* * Combine the mmap "prot" argument into "vm_flags" used internally. */static inline vm_flags_tcalc_vm_prot_bits(unsigned long prot, unsigned long pkey){ return _calc_vm_trans(prot, PROT_READ, VM_READ ) | _calc_vm_trans(prot, PROT_WRITE, VM_WRITE) | _calc_vm_trans(prot, PROT_EXEC, VM_EXEC) | arch_calc_vm_prot_bits(prot, pkey);}
/* * Combine the mmap "flags" argument into "vm_flags" used internally. */static inline vm_flags_tcalc_vm_flag_bits(struct file *file, unsigned long flags){ return _calc_vm_trans(flags, MAP_GROWSDOWN, VM_GROWSDOWN ) | _calc_vm_trans(flags, MAP_LOCKED, VM_LOCKED ) | _calc_vm_trans(flags, MAP_SYNC, VM_SYNC ) |#ifdef CONFIG_TRANSPARENT_HUGEPAGE _calc_vm_trans(flags, MAP_STACK, VM_NOHUGEPAGE) |#endif arch_calc_vm_flag_bits(file, flags);}
unsigned long vm_commit_limit(void);
#ifndef arch_memory_deny_write_exec_supportedstatic inline bool arch_memory_deny_write_exec_supported(void){ return true;}#define arch_memory_deny_write_exec_supported arch_memory_deny_write_exec_supported#endif#endif /* _LINUX_MMAN_H */