cpu_stop: add dummy implementation for UP

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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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Tejun Heo 2010-05-08 16:20:53 +02:00

parent fc390cde36

commit bbf1bb3eee

3 changed files with 68 additions and 7 deletions

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kernel/Makefile

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