mm/compaction: handle free_pages_prepare() properly in compaction_free()
authorZi Yan <ziy@nvidia.com>
Mon, 22 Jun 2026 15:30:42 +0000 (11:30 -0400)
committerAndrew Morton <akpm@linux-foundation.org>
Thu, 2 Jul 2026 02:02:53 +0000 (19:02 -0700)
commit7da7d599b8a83271c464adfd5ef160202b470570
tree0d18c3ada27c547d2e6451bb3dccc18ba4984dba
parent05ea83ee88ca70f8932906d9f2617ff996f45b50
mm/compaction: handle free_pages_prepare() properly in compaction_free()

free_pages_prepare() can fail but compaction_free() does not handle the
failure case.  Failed pages should not be added back to cc->freepages for
future use, since they can be either PageHWPoison or free_page_is_bad()
and might cause data corruption.

Link: https://lore.kernel.org/20260622-handle_free_pages_prepare_in_compaction_free-v1-1-fcf3b14abcf7@nvidia.com
Fixes: 733aea0b3a7b ("mm/compaction: add support for >0 order folio memory compaction.")
Signed-off-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Cc: Brendan Jackman <jackmanb@google.com>
Cc: Jiaqi Yan <jiaqiyan@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
mm/compaction.c