Cregit: Linux 6.18: processor.h

Contributors: 7
Author	Tokens	Token Proportion	Commits	Commit Proportion
Vincenzo Frascino	13	37.14%	1	14.29%
Huacai Chen	12	34.29%	1	14.29%
Linus Torvalds	4	11.43%	1	14.29%
Thomas Huth	2	5.71%	1	14.29%
Alex Smith	2	5.71%	1	14.29%
Jiaxun Yang	1	2.86%	1	14.29%
Anton Blanchard	1	2.86%	1	14.29%
Total	35		7

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2020 ARM Ltd.
 */
#ifndef __ASM_VDSO_PROCESSOR_H
#define __ASM_VDSO_PROCESSOR_H

#ifndef __ASSEMBLER__

#ifdef CONFIG_CPU_LOONGSON64
/*
 * Loongson-3's SFB (Store-Fill-Buffer) may buffer writes indefinitely when a
 * tight read loop is executed, because reads take priority over writes & the
 * hardware (incorrectly) doesn't ensure that writes will eventually occur.
 *
 * Since spin loops of any kind should have a cpu_relax() in them, force an SFB
 * flush from cpu_relax() such that any pending writes will become visible as
 * expected.
 */
#define cpu_relax()	smp_mb()
#else
#define cpu_relax()	barrier()
#endif

#endif /* __ASSEMBLER__ */

#endif /* __ASM_VDSO_PROCESSOR_H */