linux-kernel - Re: [PATCH 1/2] perf tools: allow building for ARM

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Date:	Fri, 11 Dec 2009 21:22:22 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Mikael Pettersson <mikpe@...uu.se>
Cc:	Jamie Iles <jamie.iles@...ochip.com>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 1/2] perf tools: allow building for ARM

On Fri, Dec 11, 2009 at 12:26:57PM +0100, Mikael Pettersson wrote:
> The correct solution is to invoke a kernel-exported CPU-specific helper
> function in the ARM kernel helper page.
> 
> I see a __kuser_memory_barrier entry there which maps to smp_dmb.

That is indeed the correct way to do this - otherwise user programs will
be tied to particular architecture versions, and either an undefined
instruction fault will happen, or worse, the desired effect will not
happen.
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