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| author | Hugh Dickins <hugh@veritas.com> | 2009-02-08 20:56:58 +0000 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-02-08 13:53:28 -0800 |
| commit | d5b562330ec766292a3ac54ae5e0673610bd5b3d (patch) | |
| tree | a0e10b64c1f7264efd073bbb0d93011c2064730f | |
| parent | 8e4921515c1a379539607eb443d51c30f4f7f338 (diff) | |
| download | lwn-d5b562330ec766292a3ac54ae5e0673610bd5b3d.tar.gz lwn-d5b562330ec766292a3ac54ae5e0673610bd5b3d.zip | |
mm: fix error case in mlock downgrade reversion
Commit 27421e211a39784694b597dbf35848b88363c248, Manually revert
"mlock: downgrade mmap sem while populating mlocked regions", has
introduced its own regression: __mlock_vma_pages_range() may report
an error (for example, -EFAULT from trying to lock down pages from
beyond EOF), but mlock_vma_pages_range() must hide that from its
callers as before.
Reported-by: Sami Farin <safari-kernel@safari.iki.fi>
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/mlock.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/mm/mlock.c b/mm/mlock.c index 028ec482fdd4..037161d61b4e 100644 --- a/mm/mlock.c +++ b/mm/mlock.c @@ -311,7 +311,10 @@ long mlock_vma_pages_range(struct vm_area_struct *vma, is_vm_hugetlb_page(vma) || vma == get_gate_vma(current))) { - return __mlock_vma_pages_range(vma, start, end, 1); + __mlock_vma_pages_range(vma, start, end, 1); + + /* Hide errors from mmap() and other callers */ + return 0; } /* |