diff options
| author | Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | 2009-02-12 13:45:34 -0800 |
|---|---|---|
| committer | Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | 2009-03-29 23:29:15 -0700 |
| commit | a8a93f3f03b7a8008d720e8d91798efe599d416c (patch) | |
| tree | 7238d910d74a8df91280a47bab57707beb4fa101 | |
| parent | 0d34fb8e93ceba7b6dad0062dbb4a0813bacd75b (diff) | |
mm: disable preemption in apply_to_pte_range
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>
| -rw-r--r-- | mm/memory.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/memory.c b/mm/memory.c index baa999e87cd..b80cc31292b 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -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); |