include/asm-generic/barrier.h

Source file repositories/reference/linux-study-clean/include/asm-generic/barrier.h

File Facts

System
Linux kernel
Corpus path
include/asm-generic/barrier.h
Extension
.h
Size
7553 bytes
Lines
307
Domain
Repository Root And Misc
Bucket
include
Inferred role
Repository Root And Misc: implementation source
Status
source implementation candidate

Why This File Exists

Top-level or miscellaneous repository surface. Use this as map coverage unless a later manual pass promotes the file into a deeper subsystem dossier.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef __ASM_GENERIC_BARRIER_H
#define __ASM_GENERIC_BARRIER_H

#ifndef __ASSEMBLY__

#include <linux/compiler.h>
#include <linux/kcsan-checks.h>
#include <asm/rwonce.h>

#ifndef nop
#define nop()	asm volatile ("nop")
#endif

/*
 * Architectures that want generic instrumentation can define __ prefixed
 * variants of all barriers.
 */

#ifdef __mb
#define mb()	do { kcsan_mb(); __mb(); } while (0)
#endif

#ifdef __rmb
#define rmb()	do { kcsan_rmb(); __rmb(); } while (0)
#endif

#ifdef __wmb
#define wmb()	do { kcsan_wmb(); __wmb(); } while (0)
#endif

#ifdef __dma_mb
#define dma_mb()	do { kcsan_mb(); __dma_mb(); } while (0)
#endif

#ifdef __dma_rmb
#define dma_rmb()	do { kcsan_rmb(); __dma_rmb(); } while (0)
#endif

#ifdef __dma_wmb
#define dma_wmb()	do { kcsan_wmb(); __dma_wmb(); } while (0)
#endif

/*
 * Force strict CPU ordering. And yes, this is required on UP too when we're
 * talking to devices.
 *
 * Fall back to compiler barriers if nothing better is provided.
 */

#ifndef mb
#define mb()	barrier()
#endif

#ifndef rmb
#define rmb()	mb()
#endif

#ifndef wmb
#define wmb()	mb()
#endif

#ifndef dma_mb
#define dma_mb()	mb()
#endif

#ifndef dma_rmb
#define dma_rmb()	rmb()
#endif

#ifndef dma_wmb
#define dma_wmb()	wmb()
#endif

#ifndef __smp_mb
#define __smp_mb()	mb()
#endif

#ifndef __smp_rmb
#define __smp_rmb()	rmb()
#endif

#ifndef __smp_wmb
#define __smp_wmb()	wmb()
#endif

#ifdef CONFIG_SMP

#ifndef smp_mb
#define smp_mb()	do { kcsan_mb(); __smp_mb(); } while (0)
#endif

Annotation

Implementation Notes