From: Peter Zijlstra <peterz@infradead.org>
Date: Wed, 5 Sep 2012 22:03:50 +0000 (+0200)
Subject: sched: Fix load avg vs. cpu-hotplug
X-Git-Tag: omap-for-v3.7-rc1/fixes-cpufreq-signed~95^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=08bedae1d0acd8c9baf514fb69fa199d0c8345f6;p=pandora-kernel.git

sched: Fix load avg vs. cpu-hotplug

Commit f319da0c68 ("sched: Fix load avg vs cpu-hotplug") was an
incomplete fix:

In particular, the problem is that at the point it calls
calc_load_migrate() nr_running := 1 (the stopper thread), so move the
call to CPU_DEAD where we're sure that nr_running := 0.

Also note that we can call calc_load_migrate() without serialization, we
know the state of rq is stable since its cpu is dead, and we modify the
global state using appropriate atomic ops.

Suggested-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1346882630.2600.59.camel@twins
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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