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SubjectRE: [PATCH 2/2] x86/MCE: Add command line option to extend MCE Records pool
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> The usual reason is to exclude other CPUs also doing list_add_rcu()
> on the same list. Or is there other synchronization that is preventing
> concurrent updates?

In this case the patch is trying to do a one-time bump of the pool size.
So no races here.

-Tony


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