Re: [PATCH] Fix RCU race in access of nohz_cpu_mask

[Paul Mackerras]

Andrew Morton writes:

> So foo_mb() in preemptible code is potentially buggy.
> 
> I guess we assume that a context switch accidentally did enough of the
> right types of barriers for things to work OK.

The context switch code on powerpc includes an mb() for exactly this
reason.

Paul.
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