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

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Date:	Thu, 23 Dec 2010 09:35:44 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	ying.huang@...el.com
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	andi@...stfloor.org, peterz@...radead.org,
	torvalds@...ux-foundation.org, mingo@...e.hu, rth@...ddle.net,
	linux@....linux.org.uk, starvik@...s.com, dhowells@...hat.com,
	ysato@...rs.sourceforge.jp, tony.luck@...el.com,
	takata@...ux-m32r.org, geert@...ux-m68k.org, monstr@...str.eu,
	ralf@...ux-mips.org, kyle@...artin.ca, schwidefsky@...ibm.com,
	liqin.chen@...plusct.com, mingo@...hat.com, chris@...kel.net
Subject: Re: [RFC -v9 1/4] Add Kconfig option ARCH_HAVE_NMI_SAFE_CMPXCHG

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.

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