Re: [PATCH] lockdep: Make lockstats counting per cpu

[Peter Zijlstra]

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().

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