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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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