From 45f83cefe3a5f0476ac3f96382ebfdc3fe4caab2 Mon Sep 17 00:00:00 2001 From: Andrea Arcangeli Date: Wed, 28 Mar 2012 14:42:40 -0700 Subject: mm: thp: fix up pmd_trans_unstable() locations pmd_trans_unstable() should be called before pmd_offset_map() in the locations where the mmap_sem is held for reading. Signed-off-by: Andrea Arcangeli Cc: Mel Gorman Cc: Hugh Dickins Cc: Larry Woodman Cc: Ulrich Obergfell Cc: Rik van Riel Cc: Mark Salter Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/proc/task_mmu.c | 5 ++--- mm/memcontrol.c | 4 ++++ 2 files changed, 6 insertions(+), 3 deletions(-) diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 9694cc283511..c283832d411d 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -781,9 +781,6 @@ static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, int err = 0; pagemap_entry_t pme = make_pme(PM_NOT_PRESENT); - if (pmd_trans_unstable(pmd)) - return 0; - /* find the first VMA at or above 'addr' */ vma = find_vma(walk->mm, addr); spin_lock(&walk->mm->page_table_lock); @@ -802,6 +799,8 @@ static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, return err; } + if (pmd_trans_unstable(pmd)) + return 0; for (; addr != end; addr += PAGE_SIZE) { /* check to see if we've left 'vma' behind diff --git a/mm/memcontrol.c b/mm/memcontrol.c index b2ee6df0e9bb..7d698df4a067 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -5306,6 +5306,8 @@ static int mem_cgroup_count_precharge_pte_range(pmd_t *pmd, return 0; } + if (pmd_trans_unstable(pmd)) + return 0; pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); for (; addr != end; pte++, addr += PAGE_SIZE) if (get_mctgt_type(vma, addr, *pte, NULL)) @@ -5502,6 +5504,8 @@ static int mem_cgroup_move_charge_pte_range(pmd_t *pmd, return 0; } + if (pmd_trans_unstable(pmd)) + return 0; retry: pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); for (; addr != end; addr += PAGE_SIZE) { -- cgit v1.2.3-59-g8ed1b