[tip:perf/core] x86, alternative: Add altinstruction_entry macro

[tip-bot for Fenghua Yu]

Commit-ID:  9072d11da15a71e086eab3b5085184f2c1d06913
Gitweb:     http://git.kernel.org/tip/9072d11da15a71e086eab3b5085184f2c1d06913
Author:     Fenghua Yu <fenghua.yu@xxxxxxxxx>
AuthorDate: Tue, 17 May 2011 15:29:13 -0700
Committer:  H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
CommitDate: Tue, 17 May 2011 15:40:25 -0700

x86, alternative: Add altinstruction_entry macro

Add altinstruction_entry macro to generate .altinstructions section
entries from assembly code.  This should be less failure-prone than
open-coding.

Signed-off-by: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Link: http://lkml.kernel.org/r/1305671358-14478-5-git-send-email-fenghua.yu@xxxxxxxxx
Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
---
 arch/x86/include/asm/alternative-asm.h |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/alternative-asm.h b/arch/x86/include/asm/alternative-asm.h
index a63a68b..94d420b 100644
--- a/arch/x86/include/asm/alternative-asm.h
+++ b/arch/x86/include/asm/alternative-asm.h
@@ -15,4 +15,13 @@
 	.endm
 #endif
 
+.macro altinstruction_entry orig alt feature orig_len alt_len
+	.align 8
+	.quad \orig
+	.quad \alt
+	.word \feature
+	.byte \orig_len
+	.byte \alt_len
+.endm
+
 #endif  /*  __ASSEMBLY__  */
--
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