Commit a8a93f3f authored Feb 12, 2009 by Jeremy Fitzhardinge

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>

parent 0d34fb8e

mm/memory.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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);