Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
x86/vdso: Enable x86 to use common headers
Enable x86 to use only the common headers in the implementation
of the vDSO library.
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200320145351.32292-24-vincenzo.frascino@arm.com
authored by
Vincenzo Frascino
and committed by
Thomas Gleixner
abc22418
c135fc87
+24
-11
+1
-11
arch/x86/include/asm/processor.h
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arch/x86/include/asm/processor.h
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#include <asm/fpu/types.h>
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#include <asm/unwind_hints.h>
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#include <asm/vmxfeatures.h>
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#include <asm/vdso/processor.h>
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#include <linux/personality.h>
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#include <linux/cache.h>
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cpuid(op, &eax, &ebx, &ecx, &edx);
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return edx;
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}
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/* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
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static __always_inline void rep_nop(void)
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{
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asm volatile("rep; nop" ::: "memory");
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}
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static __always_inline void cpu_relax(void)
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{
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rep_nop();
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}
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/*
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arch/x86/include/asm/vdso/processor.h
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arch/x86/include/asm/vdso/processor.h
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2020 ARM Ltd.
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*/
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#ifndef __ASM_VDSO_PROCESSOR_H
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#define __ASM_VDSO_PROCESSOR_H
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#ifndef __ASSEMBLY__
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/* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
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static __always_inline void rep_nop(void)
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{
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asm volatile("rep; nop" ::: "memory");
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}
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static __always_inline void cpu_relax(void)
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{
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rep_nop();
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}
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#endif /* __ASSEMBLY__ */
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#endif /* __ASM_VDSO_PROCESSOR_H */