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    SubjectRe: [PATCH] lockdep: Make lockstats counting per cpu
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    On Fri, 2010-03-26 at 07:52 +0100, Peter Zijlstra wrote:
    > On Fri, 2010-03-26 at 03:22 +0100, Frederic Weisbecker wrote:
    > > We can't use irqsafe per cpu counters for that as
    > > these stats might be also written from NMI path, and irqsafe per
    > > cpu counters are not NMI safe, but local_t operations are.
    > >
    > lockdep shouldn't do NMI, nmi_enter() has an explicit lockdep_off().

    Also, more importantly, you simply should never use locks in NMI context
    to begin with ;-)



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