From: Tejun Heo <tj@kernel.org>
Date: Tue, 29 Jun 2010 08:07:12 +0000 (+0200)
Subject: workqueue: introduce global cwq and unify cwq locks
X-Git-Tag: v2.6.36-rc1~506^2~37
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8b03ae3cde59af9facab7c831b4141515d5dbcc8;p=pandora-kernel.git

workqueue: introduce global cwq and unify cwq locks

There is one gcwq (global cwq) per each cpu and all cwqs on an cpu
point to it.  A gcwq contains a lock to be used by all cwqs on the cpu
and an ida to give IDs to workers belonging to the cpu.

This patch introduces gcwq, moves worker_ida into gcwq and make all
cwqs on the same cpu use the cpu's gcwq->lock instead of separate
locks.  gcwq->ida is now protected by gcwq->lock too.

Signed-off-by: Tejun Heo <tj@kernel.org>
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