include/linux/mman.h

Source file repositories/reference/linux-study-clean/include/linux/mman.h

File Facts

System
Linux kernel
Corpus path
include/linux/mman.h
Extension
.h
Size
4265 bytes
Lines
174
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

#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_SMP
extern s32 vm_committed_as_batch;
extern void mm_compute_batch(int overcommit_policy);
#else
#define vm_committed_as_batch 0
static 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

Annotation

Implementation Notes