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parisc: Add alternative patching to synchronize_caches define

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This change allows the sync barrier instruction to be patched to a nop.

Signed-off-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
John David Anglin 2020-10-02 19:55:04 +02:00 committed by Helge Deller
parent f15309d7ad
commit 6caf55e570
1 changed files with 5 additions and 1 deletions
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6
arch/parisc/include/asm/barrier.h
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@ -2,11 +2,15 @@
#ifndef __ASM_BARRIER_H
#define __ASM_BARRIER_H
#include <asm/alternative.h>
#ifndef __ASSEMBLY__
/* The synchronize caches instruction executes as a nop on systems in
which all memory references are performed in order. */
#define synchronize_caches() __asm__ __volatile__ ("sync" : : : "memory")
#define synchronize_caches() asm volatile("sync" \
ALTERNATIVE(ALT_COND_NO_SMP, INSN_NOP) \
: : : "memory")
#if defined(CONFIG_SMP)
#define mb() do { synchronize_caches(); } while (0)