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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-01-09 08:36:54 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-01-09 08:36:54 -0800 |
| commit | e53289c0c5e5a24e29e571eba7af05c845c10890 (patch) | |
| tree | fd8852edc6b91152f30b8a7eb0e75fc5ca6750af | |
| parent | 08c097fc3bb283299a6915a6a3795edab85979b1 (diff) | |
| download | lwn-e53289c0c5e5a24e29e571eba7af05c845c10890.tar.gz lwn-e53289c0c5e5a24e29e571eba7af05c845c10890.zip | |
mm: reinstante dropped pmd_trans_splitting() check
The check for a pmd being in the process of being split was dropped by
mistake by commit d10e63f29488 ("mm: numa: Create basic numa page
hinting infrastructure"). Put it back.
Reported-by: Dave Jones <davej@redhat.com>
Debugged-by: Hillf Danton <dhillf@gmail.com>
Acked-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Cc: Kirill Shutemov <kirill@shutemov.name>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/memory.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/mm/memory.c b/mm/memory.c index 49fb1cf08611..bb1369f7b9b4 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3711,6 +3711,14 @@ retry: if (pmd_trans_huge(orig_pmd)) { unsigned int dirty = flags & FAULT_FLAG_WRITE; + /* + * If the pmd is splitting, return and retry the + * the fault. Alternative: wait until the split + * is done, and goto retry. + */ + if (pmd_trans_splitting(orig_pmd)) + return 0; + if (pmd_numa(orig_pmd)) return do_huge_pmd_numa_page(mm, vma, address, orig_pmd, pmd); |