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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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12345678910111213141516171819202122232425262728/* 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 */