linux-kernel - Re: [PATCH v0 21/71] perf tools: Add feature test for __sync_val_compare_and

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Date:	Thu, 12 Dec 2013 15:45:57 +0200
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Andi Kleen <ak@...ux.intel.com>
CC:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v0 21/71] perf tools: Add feature test for __sync_val_compare_and_swap

On 11/12/13 22:07, Andi Kleen wrote:
>> Can you provide more info about these gcc builtins and what is the
>> minimum system where this test will succeed?
> 
> CMPXCHG for x86 is available since the 486 or so, so practically
> everywhere.
> 
> I think that's mainly for other architectures.
> 
> it would be reasonable to just use #if defined(__x86_64__) || defined(__i386__)
> instead.

__sync_val_compare_and_swap() is being used in the itrace abstraction which
is architecture neutral, so I can't use x86 defines.

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