Re: [PATCH] x86: Use asm-goto to implement mutex fast path on x86-64

[Peter Zijlstra]

On Fri, Jun 28, 2013 at 07:12:18AM -0700, H. Peter Anvin wrote:
> On 06/28/2013 07:09 AM, Borislav Petkov wrote:
> > 
> > Our testing for asm goto otherwise is a bit more, hmm, hands-on in
> > arch/x86/include/asm/cpufeature.h:
> > 
> > #if __GNUC__ > 4 || __GNUC_MINOR__ >= 5
> > 
> > Maybe I should change that to the more explicit CC_HAVE_ASM_GOTO then.
> > 
> 
> We should... we didn't have the asm goto test at the time that code was
> written, but I think the tracing guys added it either because some
> distros backported asm goto or to deal with it on non-x86 architectures.

gcc backport in distro iirc
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