diff options
| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2017-02-24 14:57:54 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-02-24 17:46:55 -0800 |
| commit | a8fa41ad2f6f7ca08edd1afcf8149ae5a4dcf654 (patch) | |
| tree | 5ec90b25a6e633bc61df880a9c179c2c094e35cf /mm/internal.h | |
| parent | 699fa216808fff47efc9743f92f1b8a9f9bf5321 (diff) | |
mm, rmap: check all VMAs that PTE-mapped THP can be part of
Current rmap code can miss a VMA that maps PTE-mapped THP if the first
suppage of the THP was unmapped from the VMA.
We need to walk rmap for the whole range of offsets that THP covers, not
only the first one.
vma_address() also need to be corrected to check the range instead of
the first subpage.
Link: http://lkml.kernel.org/r/20170129173858.45174-6-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/internal.h')
| -rw-r--r-- | mm/internal.h | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/mm/internal.h b/mm/internal.h index 8ab72f4374e0..ccfc2a2969f4 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -335,12 +335,15 @@ __vma_address(struct page *page, struct vm_area_struct *vma) static inline unsigned long vma_address(struct page *page, struct vm_area_struct *vma) { - unsigned long address = __vma_address(page, vma); + unsigned long start, end; + + start = __vma_address(page, vma); + end = start + PAGE_SIZE * (hpage_nr_pages(page) - 1); /* page should be within @vma mapping range */ - VM_BUG_ON_VMA(address < vma->vm_start || address >= vma->vm_end, vma); + VM_BUG_ON_VMA(end < vma->vm_start || start >= vma->vm_end, vma); - return address; + return max(start, vma->vm_start); } #else /* !CONFIG_MMU */ |