Commit-ID: 2ca052a3710fac208eee690faefdeb8bbd4586a1 Gitweb: http://git.kernel.org/tip/2ca052a3710fac208eee690faefdeb8bbd4586a1 Author: Jeremy Fitzhardinge <jeremy@xxxxxxxx> AuthorDate: Mon, 2 Apr 2012 16:15:33 -0700 Committer: H. Peter Anvin <hpa@xxxxxxxxx> CommitDate: Fri, 6 Apr 2012 09:39:39 -0700 x86: Use correct byte-sized register constraint in __xchg_op() x86-64 can access the low half of any register, but i386 can only do it with a subset of registers. 'r' causes compilation failures on i386, but 'q' expresses the constraint properly. Signed-off-by: Jeremy Fitzhardinge <jeremy@xxxxxxxx> Link: http://lkml.kernel.org/r/4F7A3315.501@xxxxxxxx Reported-by: Leigh Scott <leigh123linux@xxxxxxxxxxxxxx> Tested-by: Thomas Reitmayr <treitmayr@xxxxxxxxxx> Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> v3.3 --- arch/x86/include/asm/cmpxchg.h | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/arch/x86/include/asm/cmpxchg.h b/arch/x86/include/asm/cmpxchg.h index b3b7332..bc18d0e 100644 --- a/arch/x86/include/asm/cmpxchg.h +++ b/arch/x86/include/asm/cmpxchg.h @@ -43,7 +43,7 @@ extern void __add_wrong_size(void) switch (sizeof(*(ptr))) { \ case __X86_CASE_B: \ asm volatile (lock #op "b %b0, %1\n" \ - : "+r" (__ret), "+m" (*(ptr)) \ + : "+q" (__ret), "+m" (*(ptr)) \ : : "memory", "cc"); \ break; \ case __X86_CASE_W: \ -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html