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mm: fix error case in mlock downgrade reversion

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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>
This commit is contained in:
Hugh Dickins 2009-02-08 20:56:58 +00:00 committed by Linus Torvalds
parent 8e4921515c
commit d5b562330e
1 changed files with 4 additions and 1 deletions
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5
mm/mlock.c
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@ -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;
}
/*