x86/paravirt: make arch_flush_lazy_mmu/cpu disable preemption

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Impact: avoid access to percpu vars in preempible context

They are intended to be used whenever there's the possibility
that there's some stale state which is going to be overwritten
with a queued update, or to force a state change when we may be
in lazy mode.  Either way, we could end up calling it with
preemption enabled, so wrap the functions in their own little
preempt-disable section so they can be safely called in any
context (though preemption should never be enabled if we're actually
in a lazy state).

(Move out of line to avoid #include dependencies.)
    
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

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Jeremy Fitzhardinge 2009-02-12 10:02:56 -08:00 • committed by Thomas Gleixner

parent be03d9e802

commit d85cf93da6

2 changed files with 26 additions and 15 deletions

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17

arch/x86/include/asm/paravirt.h

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24

arch/x86/kernel/paravirt.c

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