Messages in this thread | | | Date | Fri, 06 Apr 2012 00:46:06 -0700 | From | Jeremy Fitzhardinge <> | Subject | Re: [PATCH] Use correct byte-sized register constraint in __xchg_op() |
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PIng?
On 04/02/2012 04:15 PM, Jeremy Fitzhardinge wrote: > 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@goop.org> > Reported-by: Leigh Scott <leigh123linux@googlemail.com> > Tested-by: Thomas Reitmayr <treitmayr@devbase.at> > > 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-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ >
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