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

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Date:	Fri, 11 Dec 2009 13:04:08 +0000
From:	Jamie Iles <jamie.iles@...ochip.com>
To:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	peterz@...radead.org, jamie.iles@...ochip.com, mikpe@...uu.se,
	linux@....linux.org.uk, tglx@...utronix.de, mingo@...e.hu
Cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perf/urgent] perf tools: Allow building for ARM

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.

Jamie
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