linux-kernel - Re: Question about barriers for ARM on tools/perf/

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Message-ID: <20150508145255.GK7862@kernel.org>
Date:	Fri, 8 May 2015 11:52:55 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Will Deacon <will.deacon@....com>, Ingo Molnar <mingo@...nel.org>,
	David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Question about barriers for ARM on tools/perf/

Em Fri, May 08, 2015 at 11:37:29AM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Fri, May 08, 2015 at 04:25:13PM +0200, Peter Zijlstra escreveu:
> > He wants to do smp refcounting, which needs atomic_inc() /
> > atomic_inc_non_zero() / atomic_dec_return() etc..
 
> Right, Will concentrated on what we use those barriers for right now in
> tools/perf.

So, for reference, and this just moves what was already in
tools/perf/perf-sys.h to a place that is named as the kernel is and when
what was used in perf-sys.h is the same as in the kernel, uses the same
kernel source excerpts:

https://git.kernel.org/cgit/linux/kernel/git/acme/linux.git/log/?h=tmp.perf/barrier

- Arnaldo
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