gentoo-overlay/sys-kernel/linux-hardened-sources/files/5.4/000121_0121-use-lfence-inst...

26 lines
848 B
Diff

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Arjan van de Ven <arjan@linux.intel.com>
Date: Sat, 8 Dec 2018 18:21:32 +0000
Subject: [PATCH] use lfence instead of rep and nop
---
arch/x86/include/asm/processor.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 54f5d54280f6..ee60a1f2dd11 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -647,7 +647,7 @@ static inline unsigned int cpuid_edx(unsigned int op)
/* 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");
+ asm volatile("lfence" ::: "memory");
}
static __always_inline void cpu_relax(void)
--
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