Re: [RFC -v9 1/4] Add Kconfig option ARCH_HAVE_NMI_SAFE_CMPXCHG

[David Miller]

From: Huang Ying <ying.huang@xxxxxxxxx>
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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