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Date:	Thu, 22 May 2014 15:50:21 +0000
From:	"Luck, Tony" <>
To:	Borislav Petkov <>,
	Peter Zijlstra <>
CC:	"Srivatsa S. Bhat" <>,
	Srinivas Pandruvada <>,
	Jacob Pan <>,
	LKML <>,
	Borislav Petkov <>, Ingo Molnar <>,
	"Wysocki, Rafael J" <>,
	Thomas Gleixner <>,
	"" <>,
	Oleg Nesterov <>
Subject: RE: [PATCH] x86, MCE: Kill CPU_POST_DEAD

>> So I think we can reduce it to just the one rwsem (with recursion) if we
>> shoot CPU_POST_DEAD in the head.
> Here's the first bullet. Stressing my box here with Steve's hotplug
> script seems to work fine.
> Tony, any objections?

what was this comment referring to:

    /* intentionally ignoring frozen here */

After you move the cmci_rediscover() call, it is now in a place where we are
no longer ignoring frozen (i.e. the old placement did the rediscover even if the
CPU_TASKS_FROZEN bit was set - with the new placement we will skip rediscovery.

So we were working around some interaction between cpu hotplug and frozen.
Do we no longer need to do that?


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