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Subject: Re: [RFC][PATCH 2/6] x86, nmi: create new NMI handler routines
From: Peter Zijlstra <peterz@infradead.org>
To: Don Zickus <dzickus@redhat.com>
Cc: x86@kernel.org, Andi Kleen <andi@firstfloor.org>,
        Robert Richter <robert.richter@amd.com>, ying.huang@intel.com,
        LKML <linux-kernel@vger.kernel.org>, jason.wessel@windriver.com
Date: Tue, 23 Aug 2011 16:17:23 +0200
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On Tue, 2011-08-23 at 10:14 -0400, Don Zickus wrote:

> Maybe I don't understand kfree_rcu, but what advantage do I have by
> placing rcu_head into nmiaction that never gets used except on unregister
> (which rarely happens to begin with)?

you don't have to wait for sync_rcu(), but you're right, this is an
absolute slow patch and we don't care.