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Subject[PATCH 7/8] mm: allow preemption in apply_to_pte_range
Date
From: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

Impact: allow preemption in apply_to_pte_range updates to init_mm

Preemption is now allowed for lazy mmu mode, so don't disable
it for the inner loop of apply_to_pte_range. This only applies
when doing updates to init_mm; user pagetables are still modified
under the pte lock, so preemption is disabled anyway.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
---
mm/memory.c | 2 --
1 files changed, 0 insertions(+), 2 deletions(-)
diff --git a/mm/memory.c b/mm/memory.c
index 27f8677..ef11ac6 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1722,7 +1722,6 @@ 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);
@@ -1734,7 +1733,6 @@ 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);
--
1.6.0.6


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