arm64: Introduce asm/vdso/processor.h (f511e079) · Commits · 戴 / test

The vDSO library should only include the necessary headers required for a userspace library (UAPI and a minimal set of kernel headers). To make this possible it is necessary to isolate from the kernel headers the common parts that are strictly necessary to build the library. Introduce asm/vdso/processor.h to contain all the arm64 specific functions that are suitable for vDSO inclusion. Signed-off-by:

Vincenzo Frascino <vincenzo.frascino@arm.com> Signed-off-by:

Thomas Gleixner <tglx@linutronix.de> Acked-by:

Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org> Link: https://lkml.kernel.org/r/20200320145351.32292-20-vincenzo.frascino@arm.com

arch/arm64/include/asm/processor.h

+2 −5

Original line number	Diff line number	Diff line
		@@ -28,6 +28,8 @@
		#include <linux/string.h>
		#include <linux/thread_info.h>

		#include <vdso/processor.h>

		#include <asm/alternative.h>
		#include <asm/cpufeature.h>
		#include <asm/hw_breakpoint.h>
		@@ -256,11 +258,6 @@ extern void release_thread(struct task_struct *);

		unsigned long get_wchan(struct task_struct *p);

		static inline void cpu_relax(void)
		{
		asm volatile("yield" ::: "memory");
		}

		/* Thread switching */
		extern struct task_struct cpu_switch_to(struct task_struct prev,
		struct task_struct *next);

arch/arm64/include/asm/vdso/processor.h

0 → 100644

+17 −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__

		static inline void cpu_relax(void)
		{
		asm volatile("yield" ::: "memory");
		}

		#endif /* __ASSEMBLY__ */

		#endif /* __ASM_VDSO_PROCESSOR_H */

Admin message