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xen-devel
[Xen-devel] [PATCH RFC V4 09/10] x86/jump_label: use GENERIC_NOP5_ATOMIC
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To: |
Steven Rostedt <rostedt@xxxxxxxxxxx> |
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Subject: |
[Xen-devel] [PATCH RFC V4 09/10] x86/jump_label: use GENERIC_NOP5_ATOMIC instead of jmp5 +0 |
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From: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
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Date: |
Wed, 12 Oct 2011 17:08:40 -0700 |
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Cc: |
Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Jan Glauber <jang@xxxxxxxxxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Jason Baron <jbaron@xxxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, David Daney <david.daney@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Michael Ellerman <michael@xxxxxxxxxxxxxx>, Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx> |
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Wed, 12 Oct 2011 17:18:54 -0700 |
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From: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
GENERIC_NOP5_ATOMIC should make a better nop.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
---
arch/x86/include/asm/jump_label.h | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/arch/x86/include/asm/jump_label.h
b/arch/x86/include/asm/jump_label.h
index a32b18c..189100e 100644
--- a/arch/x86/include/asm/jump_label.h
+++ b/arch/x86/include/asm/jump_label.h
@@ -4,12 +4,13 @@
#ifdef __KERNEL__
#include <linux/types.h>
+#include <linux/stringify.h>
#include <asm/nops.h>
#include <asm/asm.h>
#define JUMP_LABEL_NOP_SIZE 5
-#define JUMP_LABEL_INITIAL_NOP ".byte 0xe9 \n\t .long 0\n\t"
+#define JUMP_LABEL_INITIAL_NOP ".byte " __stringify(GENERIC_NOP5_ATOMIC) "\n\t"
static __always_inline bool arch_static_branch(struct jump_label_key *key)
{
--
1.7.6.4
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