lkml.org 
[lkml]   [2009]   [Jan]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 03/10] x86: fix percpu_write with 64-bit constants
Date
From: Brian Gerst <brgerst@gmail.com>

Impact: slightly better code generation for percpu_to_op()

The processor will sign-extend 32-bit immediate values in 64-bit
operations. Use the 'e' constraint ("32-bit signed integer constant,
or a symbolic reference known to fit that range") for 64-bit constants.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
---
arch/x86/include/asm/percpu.h | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index ce980db..0b64af4 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -75,7 +75,7 @@ do { \
case 8: \
asm(op "q %1,"__percpu_arg(0) \
: "+m" (var) \
- : "r" ((T__)val)); \
+ : "re" ((T__)val)); \
break; \
default: __bad_percpu_size(); \
} \
--
1.6.0.2


\
 
 \ /
  Last update: 2009-01-21 09:51    [from the cache]
©2003-2011 Jasper Spaans