mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-12 13:55:32 +00:00
Code Issues Releases Wiki Activity

x86/vdso: Enable x86 to use common headers

Browse source 
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
This commit is contained in:
Vincenzo Frascino 2020-03-20 14:53:48 +00:00 committed by Thomas Gleixner
parent c135fc875c
commit abc22418db
2 changed files with 24 additions and 11 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
arch/x86/include/asm/processor.h
View file

@ -26,6 +26,7 @@ struct vm86;
#include <asm/fpu/types.h>
#include <asm/unwind_hints.h>
#include <asm/vmxfeatures.h>
#include <asm/vdso/processor.h>
#include <linux/personality.h>
#include <linux/cache.h>
@ -677,17 +678,6 @@ static inline unsigned int cpuid_edx(unsigned int op)
return edx;
}
/* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
static __always_inline void rep_nop(void)
{
asm volatile("rep; nop" ::: "memory");
}
static __always_inline void cpu_relax(void)
{
rep_nop();
}
/*
* This function forces the icache and prefetched instruction stream to
* catch up with reality in two very specific cases:

23
arch/x86/include/asm/vdso/processor.h Normal file
View file

@ -0,0 +1,23 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2020 ARM Ltd.
*/
#ifndef __ASM_VDSO_PROCESSOR_H
#define __ASM_VDSO_PROCESSOR_H
#ifndef __ASSEMBLY__
/* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
static __always_inline void rep_nop(void)
{
asm volatile("rep; nop" ::: "memory");
}
static __always_inline void cpu_relax(void)
{
rep_nop();
}
#endif /* __ASSEMBLY__ */
#endif /* __ASM_VDSO_PROCESSOR_H */