/* 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 */