mips: vdso: Enable mips to use common headers (c135fc87) · Commits · 戴 / test

arch/mips/include/asm/processor.h

+1 −15

Original line number	Diff line number	Diff line
		@@ -22,6 +22,7 @@
		#include <asm/dsemul.h>
		#include <asm/mipsregs.h>
		#include <asm/prefetch.h>
		#include <asm/vdso/processor.h>

		/*
		* System setup and hardware flags..
		@@ -385,21 +386,6 @@ unsigned long get_wchan(struct task_struct *p);
		#define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[29])
		#define KSTK_STATUS(tsk) (task_pt_regs(tsk)->cp0_status)

		#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

		/*
		* Return_address is a replacement for __builtin_return_address(count)
		* which on certain architectures cannot reasonably be implemented in GCC

+0 −4

0 → 100644

+27 −0

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

		#ifndef __ASSEMBLY__

		#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 /* __ASSEMBLY__ */

		#endif /* __ASM_VDSO_PROCESSOR_H */