shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-08 03:40:35 +09:00
Code Issues Packages Projects Releases Wiki Activity

BACKPORT: 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
(cherry picked from commit abc22418db)
Signed-off-by: Mark Salyzyn <salyzyn@google.com>
Bug: 154668398
Change-Id: I05311771de9a6cf52a5b98812ac9ae0d933ac84a
This commit is contained in:
Vincenzo Frascino
2020-03-20 14:53:48 +00:00
committed by Alistair Delva
parent ca84a2336f
commit 292257f381
2 changed files with 24 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

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

@@ -24,6 +24,7 @@ struct vm86;
#include <asm/special_insns.h>
#include <asm/fpu/types.h>
#include <asm/unwind_hints.h>
#include <asm/vdso/processor.h>
#include <linux/personality.h>
#include <linux/cache.h>
@@ -659,17 +660,6 @@ 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 */