Re: [PATCH 1/3] perf_event: fix race inperf_swevent_get_recursion_context()

[Peter Zijlstra]

On Mon, 2010-01-18 at 21:42 +0800, Xiao Guangrong wrote:
> It only disable preemption in perf_swevent_get_recursion_context()
> it can't avoid race of hard-irq and NMI
> 
> In this patch, we use atomic operation to avoid it and reduce
> cpu_ctx->recursion size, it also make this patch no need diable
> preemption

Uhm why?

This patch looks terminally broken

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