From: Tejun Heo <tj@kernel.org>
Date: Sat, 8 May 2010 14:20:53 +0000 (+0200)
Subject: cpu_stop: add dummy implementation for UP
X-Git-Tag: v2.6.35-rc1~521^2~11^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bbf1bb3eee86f2eef2baa14e600be454d09109ee;p=pandora-kernel.git

cpu_stop: add dummy implementation for UP

When !CONFIG_SMP, cpu_stop functions weren't defined at all which
could lead to build failures if UP code uses cpu_stop facility.  Add
dummy cpu_stop implementation for UP.  The waiting variants execute
the work function directly with preempt disabled and
stop_one_cpu_nowait() schedules a workqueue work.

Makefile and ifdefs around stop_machine implementation are updated to
accomodate CONFIG_SMP && !CONFIG_STOP_MACHINE case.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Ingo Molnar <mingo@elte.hu>
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