linux-kernel - Re: [tip:perf/urgent] perf tools: Allow building for ARM

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Message-ID: <20091211132640.GA12140@elte.hu>
Date:	Fri, 11 Dec 2009 14:26:40 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jamie Iles <jamie.iles@...ochip.com>
Cc:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	peterz@...radead.org, mikpe@...uu.se, linux@....linux.org.uk,
	tglx@...utronix.de, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perf/urgent] perf tools: Allow building for ARM


* Jamie Iles <jamie.iles@...ochip.com> wrote:

> On Fri, Dec 11, 2009 at 12:54:33PM +0000, tip-bot for Jamie Iles wrote:
> > Commit-ID:  58e9f94138c1d9c47f6a63632ca7a78fc6dcc15f
> > Gitweb:     http://git.kernel.org/tip/58e9f94138c1d9c47f6a63632ca7a78fc6dcc15f
> > Author:     Jamie Iles <jamie.iles@...ochip.com>
> > AuthorDate: Fri, 11 Dec 2009 12:20:09 +0000
> > Committer:  Ingo Molnar <mingo@...e.hu>
> > CommitDate: Fri, 11 Dec 2009 13:50:21 +0100
> > 
> > perf tools: Allow building for ARM
> > 
> > Add definitions of rmb() and cpu_relax() and include the ARM
> > unistd.h header. The __kuser_memory_barrier helper in the helper
> > page is used to provide the correct memory barrier depending on
> > the CPU type.
> > 
> > [ The rmb() will work on v6 and v7, segfault on v5. Dynamic
> >   detection to add v5 support will be added later. ]
>
> Sorry Ingo, my comment probably wasn't clear enough. The helper that 
> Mikael suggested should work for _all_ ARM processors including v5 and 
> earlier. It will just be a branch to a nop.

oh - good! Too late to fix the comment, i already pushed it out - but as 
long as the _code_ is fine it's a good tradeoff ;-)

	Ingo
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