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

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Message-ID: <51CD99C2.9040109@zytor.com>
Date:	Fri, 28 Jun 2013 07:12:18 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <bp@...en8.de>
CC:	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>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH] x86: Use asm-goto to implement mutex fast path on x86-64

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.

	-hpa

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