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

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Message-ID: <20131211200721.GN22695@tassilo.jf.intel.com>
Date:	Wed, 11 Dec 2013 12:07:21 -0800
From:	Andi Kleen <ak@...ux.intel.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	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>,
	Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH v0 21/71] perf tools: Add feature test for
 __sync_val_compare_and_swap

> 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.

-Andi
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