linux-kernel - Re: [RFC -v9 1/4] Add Kconfig option ARCH_HAVE_NMI_SAFE

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Date:	Fri, 24 Dec 2010 08:56:45 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	David Miller <davem@...emloft.net>
Cc:	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
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	"mingo@...hat.com" <mingo@...hat.com>,
	"chris@...kel.net" <chris@...kel.net>
Subject: Re: [RFC -v9 1/4] Add Kconfig option ARCH_HAVE_NMI_SAFE_CMPXCHG

Hi, David,

Thanks for review.

On Fri, 2010-12-24 at 01:35 +0800, David Miller wrote:
> From: Huang Ying <ying.huang@...el.com>
> Date: Thu, 23 Dec 2010 13:43:20 +0800
> 
> > --- a/arch/sparc/Kconfig
> > +++ b/arch/sparc/Kconfig
> > @@ -22,6 +22,7 @@ config SPARC
> >  	select RTC_CLASS
> >  	select RTC_DRV_M48T59
> >  	select HAVE_IRQ_WORK
> > +	select ARCH_HAVE_NMI_SAFE_CMPXCHG
> >  	select HAVE_DMA_ATTRS
> >  	select HAVE_DMA_API_DEBUG
> >  	select HAVE_ARCH_JUMP_LABEL
> 
> This should only be set for "SPARC64".  SPARC32's cmpxchg uses spinlocks and
> IRQ disabling, which is not NMI safe.

I will fix this.

Best Regards,
Huang Ying


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