tree 29949f727af8b6c19fd689fa10f123ea84c03cb0
parent 7fd7d83d49914f03aefffba6aee09032fcd54cce
author Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> 1234943181 -0800
committer Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> 1238394960 -0700

x86/paravirt: flush pending mmu updates on context switch

Impact: allow preemption during lazy mmu updates

If we're in lazy mmu mode when context switching, leave
lazy mmu mode, but remember the task's state in
TIF_LAZY_MMU_UPDATES.  When we resume the task, check this
flag and re-enter lazy mmu mode if its set.

This sets things up for allowing lazy mmu mode while preemptible,
though that won't actually be active until the next change.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>