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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 <aarcange@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Hugh Dickins <hughd@google.com>
Cc: Larry Woodman <lwoodman@redhat.com>
Cc: Ulrich Obergfell <uobergfe@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mark Salter <msalter@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrea Arcangeli 2012-03-28 14:42:40 -07:00 committed by Linus Torvalds
parent 623e3db9f9
commit 45f83cefe3
2 changed files with 6 additions and 3 deletions
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5
fs/proc/task_mmu.c
View File

@ -781,9 +781,6 @@ static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
int err = 0; int err = 0;
pagemap_entry_t pme = make_pme(PM_NOT_PRESENT); pagemap_entry_t pme = make_pme(PM_NOT_PRESENT);
if (pmd_trans_unstable(pmd))
return 0;
/* find the first VMA at or above 'addr' */ /* find the first VMA at or above 'addr' */
vma = find_vma(walk->mm, addr); vma = find_vma(walk->mm, addr);
spin_lock(&walk->mm->page_table_lock); 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; return err;
} }
if (pmd_trans_unstable(pmd))
return 0;
for (; addr != end; addr += PAGE_SIZE) { for (; addr != end; addr += PAGE_SIZE) {
/* check to see if we've left 'vma' behind /* check to see if we've left 'vma' behind

4
mm/memcontrol.c
View File

@ -5306,6 +5306,8 @@ static int mem_cgroup_count_precharge_pte_range(pmd_t *pmd,
return 0; return 0;
} }
if (pmd_trans_unstable(pmd))
return 0;
pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
for (; addr != end; pte++, addr += PAGE_SIZE) for (; addr != end; pte++, addr += PAGE_SIZE)
if (get_mctgt_type(vma, addr, *pte, NULL)) 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; return 0;
} }
if (pmd_trans_unstable(pmd))
return 0;
retry: retry:
pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
for (; addr != end; addr += PAGE_SIZE) { for (; addr != end; addr += PAGE_SIZE) {