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xen/mmu: weaken flush_tlb_other test

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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>
This commit is contained in:
Jeremy Fitzhardinge 2009-03-04 17:36:57 -08:00
parent b96229b50d
commit e3f8a74e3a
1 changed files with 2 additions and 2 deletions
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4
arch/x86/xen/mmu.c
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@ -1302,8 +1302,8 @@ static void xen_flush_tlb_others(const struct cpumask *cpus,
} *args;
struct multicall_space mcs;
BUG_ON(cpumask_empty(cpus));
BUG_ON(!mm);
if (cpumask_empty(cpus))
return; /* nothing to do */
mcs = xen_mc_entry(sizeof(*args));
args = mcs.args;