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

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Message-ID: <20130628151533.GD6626@twins.programming.kicks-ass.net>
Date:	Fri, 28 Jun 2013 17:15:33 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>,
	Wedson Almeida Filho <wedsonaf@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] x86: Use asm-goto to implement mutex fast path on x86-64

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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