linux-kernel - Re: [PATCH v2] ARM: vexpress: Use wfi macro in platform_do

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Message-ID: <20110822135952.GE2796@pulham.picochip.com>
Date:	Mon, 22 Aug 2011 14:59:52 +0100
From:	Jamie Iles <jamie@...ieiles.com>
To:	Nick Bowler <nbowler@...iptictech.com>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Jamie Iles <jamie@...ieiles.com>,
	Russell King <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] ARM: vexpress: Use wfi macro in platform_do_lowpower.

On Mon, Aug 22, 2011 at 09:54:19AM -0400, Nick Bowler wrote:
> Current Versatile Express CPU hotplug code includes a hardcoded WFI
> instruction, in ARM encoding.  When the kernel is compiled in Thumb-2
> mode, this is invalid and causes the machine to hang hard when a CPU
> is offlined.
> 
> Using the wfi macro (which uses the appropriate assembler mnemonic)
> causes the correct instruction to be emitted in either case.  As a
> consequence of this change, an apparently vestigial "cc" clobber is
> dropped from the asm (the macro uses "memory" only).
> 
> Signed-off-by: Nick Bowler <nbowler@...iptictech.com>
> ---

Reviewed-by: Jamie Iles <jamie@...ieiles.com>

if it helps!

Jamie
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