Xishi recently reported the issue about race on reusing the target pages
of soft offlining.
Discussion and analysis showed that we need make sure that setting PG_hwpoison
should be done in the right place under zone->lock for soft offline.
1/2 handles free hugepage's case, and 2/2 hanldes free buddy page's case.
Thanks,
Naoya Horiguchi
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Summary:
Naoya Horiguchi (2):
mm: fix race on soft-offlining free huge pages
mm: soft-offline: close the race against page allocation
include/linux/page-flags.h | 5 +++++
include/linux/swapops.h | 10 ----------
mm/hugetlb.c | 11 +++++------
mm/memory-failure.c | 44 +++++++++++++++++++++++++++++++++++---------
mm/migrate.c | 4 +---
mm/page_alloc.c | 29 +++++++++++++++++++++++++++++
6 files changed, 75 insertions(+), 28 deletions(-)
