xen: disable interrupts before saving in percpu

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Impact: Fix race condition

xen_mc_batch has a small preempt race where it takes the address of a
percpu variable immediately before disabling interrupts, thereby
leaving a small window in which we may migrate to another cpu and save
the flags in the wrong percpu variable.  Disable interrupts before
saving the old flags in a percpu.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

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Jeremy Fitzhardinge 2009-02-03 16:01:46 -08:00 • committed by H. Peter Anvin

parent b1792e3670

commit 06fc732c33

1 changed files with 3 additions and 1 deletions

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arch/x86/xen/multicalls.h

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