diff options
| author | Hugh Dickins <[email protected]> | 2018-11-30 14:10:47 -0800 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2018-11-30 14:56:15 -0800 |
| commit | 06a5e1268a5fb9c2b346a3da6b97e85f2eba0f07 (patch) | |
| tree | a2ccdfe76f11e07f2538884cb9c607cc90079492 /tools/perf/scripts/python/bin/export-to-postgresql-report | |
| parent | 87c460a0bded56195b5eb497d44709777ef7b415 (diff) | |
mm/khugepaged: collapse_shmem() do not crash on Compound
collapse_shmem()'s VM_BUG_ON_PAGE(PageTransCompound) was unsafe: before
it holds page lock of the first page, racing truncation then extension
might conceivably have inserted a hugepage there already. Fail with the
SCAN_PAGE_COMPOUND result, instead of crashing (CONFIG_DEBUG_VM=y) or
otherwise mishandling the unexpected hugepage - though later we might
code up a more constructive way of handling it, with SCAN_SUCCESS.
Link: http://lkml.kernel.org/r/[email protected]
Fixes: f3f0e1d2150b2 ("khugepaged: add support of collapse for tmpfs/shmem pages")
Signed-off-by: Hugh Dickins <[email protected]>
Cc: Kirill A. Shutemov <[email protected]>
Cc: Jerome Glisse <[email protected]>
Cc: Konstantin Khlebnikov <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: <[email protected]> [4.8+]
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/bin/export-to-postgresql-report')
0 files changed, 0 insertions, 0 deletions