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x86: Use correct byte-sized register constraint in __add()

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 2ca052a x86: Use correct byte-sized register constraint in __xchg_op()

... the __add() macro also needs to use a "q" constraint in the
byte-sized case, lest we try to generate an illegal register.

Link: http://lkml.kernel.org/r/4F7A3315.501@goop.org
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Leigh Scott <leigh123linux@googlemail.com>
Cc: Thomas Reitmayr <treitmayr@devbase.at>
Cc: <stable@vger.kernel.org> v3.3
This commit is contained in:
H. Peter Anvin 2012-04-06 09:30:57 -07:00
parent 2ca052a371
commit 8c91c5325e
1 changed files with 1 additions and 1 deletions
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arch/x86/include/asm/cmpxchg.h
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@ -173,7 +173,7 @@ extern void __add_wrong_size(void)
switch (sizeof(*(ptr))) { \
case __X86_CASE_B: \
asm volatile (lock "addb %b1, %0\n" \
: "+m" (*(ptr)) : "ri" (inc) \
: "+m" (*(ptr)) : "qi" (inc) \
: "memory", "cc"); \
break; \
case __X86_CASE_W: \