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x86: fix percpu_write with 64-bit constants

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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>
This commit is contained in:
Brian Gerst 2009-01-21 17:26:05 +09:00 committed by Tejun Heo
parent 06deef892c
commit 299e26992a
1 changed files with 1 additions and 1 deletions
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2
arch/x86/include/asm/percpu.h
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@ -75,7 +75,7 @@ do { \
case 8: \ case 8: \
asm(op "q %1,"__percpu_arg(0) \ asm(op "q %1,"__percpu_arg(0) \
: "+m" (var) \ : "+m" (var) \
: "r" ((T__)val)); \ : "re" ((T__)val)); \
break; \ break; \
default: __bad_percpu_size(); \ default: __bad_percpu_size(); \
} \ } \