Commit 7b0cb87b authored Mar 20, 2020 by Vincenzo Frascino Committed by Alistair Delva Apr 27, 2020

UPSTREAM: arm64: Introduce asm/vdso/processor.h



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


(cherry picked from commit f511e079177a9b97175a9a3b0ee2374d55682403)
Signed-off-by: Mark Salyzyn <salyzyn@google.com>
Bug: 154668398
Change-Id: I9a291dc86b9c7c910331811c2f3c93db7406e956

parent 486c8821

arch/arm64/include/asm/processor.h

+2 −5

Original line number	Diff line number	Diff line
		@@ -40,6 +40,8 @@
		#include <linux/stddef.h>
		#include <linux/string.h>

		#include <vdso/processor.h>

		#include <asm/alternative.h>
		#include <asm/cpufeature.h>
		#include <asm/hw_breakpoint.h>
		@@ -227,11 +229,6 @@ 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 */