diff options
| author | Andrew Morton <akpm@linux-foundation.org> | 2014-04-23 08:27:23 +1000 |
|---|---|---|
| committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2014-04-23 08:27:23 +1000 |
| commit | 57ccff592966aa5813aca76ddd9f18c3d6f9009d (patch) | |
| tree | c5259ec089451b2e7bf1eaff587457696e2399b2 /mm | |
| parent | 4a406d057d1bd9b536b73929b90219fdaa1be3c1 (diff) | |
do_shared_fault(): check that mmap_sem is held
mmap_sem() is required to protect the vma, which holds ->vm_file, which
pins fault_page->mapping.
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Bob Liu <lliubbo@gmail.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Matthew Wilcox <matthew.r.wilcox@intel.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/memory.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/memory.c b/mm/memory.c index eac7c41456fd..7e6a74f57639 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -2944,6 +2944,8 @@ static int do_shared_fault(struct mm_struct *mm, struct vm_area_struct *vma, int dirtied = 0; int ret, tmp; + WARN_ON_ONCE(!rwsem_is_locked(&mm->mmap_sem)); + ret = __do_fault(vma, address, pgoff, flags, &fault_page); if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY))) return ret; |