Regression, bisected: hyperv shutdown panics guest

[Florian Westphal]

With 3.7, hyperv guest shutdown no longer works.
Instead, guest kernel throws a bunch of "BUG: scheduling-while-atomic"
errors and then dies.

reverting

commit 6c0c0d4d1080840eabb3d055d2fd81911111c5fd
Author: hongfeng <hongfeng@xxxxxxxxxxx>
Date:   Thu Oct 4 17:12:25 2012 -0700
poweroff: fix bug in orderly_poweroff()

fixes this problem.

Greping for users of orderly_poweroff() shows that hyperv isn't
the only caller that invokes the function from irq context.

In fact, kdoc for orderly_poweroff says:

* This may be called from any context to trigger a system shutdown.
* If the orderly shutdown fails, it will force an immediate shutdown.

Any suggestions on how to properly fix this?

Thanks,
Florian
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