linux-kernel - Re: [PATCH] ARM: mm: cpu_fa526_do

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Date:	Mon, 17 Jun 2013 17:07:21 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Jonas Jensen <jonas.jensen@...il.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	ulli.kroll@...glemail.com, arm@...nel.org,
	Florian Fainelli <florian@...nwrt.org>,
	Imre Kaloz <kaloz@...nwrt.org>
Subject: Re: [PATCH] ARM: mm: cpu_fa526_do_idle: remove WFI

On Monday 17 June 2013 15:30:21 Russell King - ARM Linux wrote:
> > > diff --git a/arch/arm/mm/proc-fa526.S b/arch/arm/mm/proc-fa526.S
> > > index d217e97..85280b1 100644
> > > --- a/arch/arm/mm/proc-fa526.S
> > > +++ b/arch/arm/mm/proc-fa526.S
> > > @@ -81,9 +81,7 @@ ENDPROC(cpu_fa526_reset)
> > >   */
> > >     .align  4
> > >  ENTRY(cpu_fa526_do_idle)
> > > -   mcr     p15, 0, r0, c7, c0, 4           @ Wait for interrupt
> > > -   mov     pc, lr
> > > -
> > > +   nop
> 
> It replaces the WFI and return with a pure nop, so we will fall through
> to cpu_fa526_dcache_clean_area().  Do we really want to clean a random
> D cache entry depending on what r0 happened to hold at this point?  I
> think not...

Right, I should have actually read the change...

	Arnd
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