diff options
| author | Hugh Dickins <[email protected]> | 2013-10-16 13:47:08 -0700 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2013-10-16 21:35:53 -0700 |
| commit | 750e8165f5e87b6a142be953640eabb13a9d350a (patch) | |
| tree | b7df57b235d3cf1c3a8eb7956042d3018bc9ed46 /tools/perf/util/scripting-engines/trace-event-python.c | |
| parent | 5b808a2300a5ac45f4798ebfac8b367e98a4b692 (diff) | |
mm: fix BUG in __split_huge_page_pmd
Occasionally we hit the BUG_ON(pmd_trans_huge(*pmd)) at the end of
__split_huge_page_pmd(): seen when doing madvise(,,MADV_DONTNEED).
It's invalid: we don't always have down_write of mmap_sem there: a racing
do_huge_pmd_wp_page() might have copied-on-write to another huge page
before our split_huge_page() got the anon_vma lock.
Forget the BUG_ON, just go back and try again if this happens.
Signed-off-by: Hugh Dickins <[email protected]>
Acked-by: Kirill A. Shutemov <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: Naoya Horiguchi <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Diffstat (limited to 'tools/perf/util/scripting-engines/trace-event-python.c')
0 files changed, 0 insertions, 0 deletions