Messages in this thread |  | | Date | Fri, 1 Nov 2013 14:47:28 +0000 | From | Mel Gorman <> | Subject | Re: [PATCH -v2 -tip] fix race between stop_two_cpus and stop_cpus |
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On Fri, Nov 01, 2013 at 10:41:46AM -0400, Rik van Riel wrote: > Subject: fix race between stop_two_cpus and stop_cpus > > There is a race between stop_two_cpus, and the global stop_cpus. > > It is possible for two CPUs to get their stopper functions queued > "backwards" from one another, resulting in the stopper threads > getting stuck, and the system hanging. This can happen because > queuing up stoppers is not synchronized. > > This patch adds synchronization between stop_cpus (a rare operation), > and stop_two_cpus. > > Signed-off-by: Rik van Riel <riel@redhat.com> > --- > v2: use lglock, as suggested by Peter & Mel, thanks to both of you > for insisting on nicer code :) >
This is a tad more comprehensible :). Thanks!
Acked-by: Mel Gorman <mgorman@suse.de>
-- Mel Gorman SUSE Labs
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