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    SubjectRe: [PATCH -v2 1/4] Add Kconfig option ARCH_HAVE_NMI_SAFE_CMPXCHG
    On Thu, Apr 07, 2011 at 09:29:03AM +0800, Huang Ying wrote:
    > cmpxchg() is widely used by lockless code, including NMI-safe lockless
    > code. But on some architectures, the cmpxchg() implementation is not
    > NMI-safe, on these architectures the lockless code may need to a
    > spin_trylock_irqsave() based implementation.
    >
    > This patch adds a Kconfig option: ARCH_HAVE_NMI_SAFE_CMPXCHG, so that
    > NMI-safe lockless code can depend on it or provide different
    > implementation according to it.
    >
    > On many architectures, cmpxchg is only NMI-safe for several specific
    > operand sizes. So, ARCH_HAVE_NMI_SAFE_CMPXCHG define in this patch
    > only guarantees cmpxchg is NMI-safe for sizeof(unsigned long).

    As this no longer touches any ARM code, I thinky you can drop me from the
    CC list. Thanks.


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