tree 900829ac17fa941e9819208489081e4de1218ac4
parent a0a1a5fd4fb15ec61117c759fe9f5c16c53d9e9c
author Tejun Heo <tj@kernel.org> 1277798832 +0200
committer Tejun Heo <tj@kernel.org> 1277798832 +0200

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>