tools/arch/s390/include/asm/barrier.h

Source file repositories/reference/linux-study-clean/tools/arch/s390/include/asm/barrier.h

File Facts

System
Linux kernel
Corpus path
tools/arch/s390/include/asm/barrier.h
Extension
.h
Size
913 bytes
Lines
45
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef __TOOLS_LINUX_ASM_BARRIER_H
#define __TOOLS_LINUX_ASM_BARRIER_H

/*
 * Force strict CPU ordering.
 * And yes, this is required on UP too when we're talking
 * to devices.
 */

#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
/* Fast-BCR without checkpoint synchronization */
#define __ASM_BARRIER "bcr 14,0\n"
#else
#define __ASM_BARRIER "bcr 15,0\n"
#endif

#define mb() do {  asm volatile(__ASM_BARRIER : : : "memory"); } while (0)

#define rmb()				mb()
#define wmb()				mb()

#define smp_store_release(p, v)			\
do {						\
	barrier();				\
	WRITE_ONCE(*p, v);			\
} while (0)

#define smp_load_acquire(p)			\
({						\
	typeof(*p) ___p1 = READ_ONCE(*p);	\
	barrier();				\
	___p1;					\
})

#endif /* __TOOLS_LIB_ASM_BARRIER_H */

Annotation

Implementation Notes