xen/mmu: weaken flush_tlb_other test
authorJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Thu, 5 Mar 2009 01:36:57 +0000 (17:36 -0800)
committerJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Wed, 8 Apr 2009 21:25:46 +0000 (14:25 -0700)
Impact: fixes crashing bug

There's no particular problem with getting an empty cpu mask,
so just shortcut-return if we get one.

Avoids crash reported by Christophe Saout <christophe@saout.de>

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

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