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mm: disable preemption in apply_to_pte_range

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Impact: bugfix

Lazy mmu mode needs preemption disabled, so if we're apply to
init_mm (which doesn't require any pte locks), then explicitly
disable preemption.  (Do it unconditionally after checking we've
successfully done the allocation to simplify the error handling.)

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
This commit is contained in:
Jeremy Fitzhardinge 2009-02-12 13:45:34 -08:00
parent 0d34fb8e93
commit a8a93f3f03
1 changed files with 2 additions and 0 deletions
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2
mm/memory.c
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@ -1718,6 +1718,7 @@ static int apply_to_pte_range(struct mm_struct *mm, pmd_t *pmd,
BUG_ON(pmd_huge(*pmd));
preempt_disable();
arch_enter_lazy_mmu_mode();
token = pmd_pgtable(*pmd);
@ -1729,6 +1730,7 @@ static int apply_to_pte_range(struct mm_struct *mm, pmd_t *pmd,
} while (pte++, addr += PAGE_SIZE, addr != end);
arch_leave_lazy_mmu_mode();
preempt_enable();
if (mm != &init_mm)
pte_unmap_unlock(pte-1, ptl);