From: Tejun Heo <tj@kernel.org>
Date: Tue, 18 Sep 2012 19:48:43 +0000 (-0700)
Subject: workqueue: reimplement work_on_cpu() using system_wq
X-Git-Tag: v3.2.31~98
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b15bea04d4662a3b8fdf0d039a56f753be151907;p=pandora-kernel.git

workqueue: reimplement work_on_cpu() using system_wq

commit ed48ece27cd3d5ee0354c32bbaec0f3e1d4715c3 upstream.

The existing work_on_cpu() implementation is hugely inefficient.  It
creates a new kthread, execute that single function and then let the
kthread die on each invocation.

Now that system_wq can handle concurrent executions, there's no
advantage of doing this.  Reimplement work_on_cpu() using system_wq
which makes it simpler and way more efficient.

stable: While this isn't a fix in itself, it's needed to fix a
        workqueue related bug in cpufreq/powernow-k8.  AFAICS, this
        shouldn't break other existing users.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Len Brown <lenb@kernel.org>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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