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17 May 2024, 11:00:25 UTC
Revision b653db77350c7307a513b81856fe53e94cf42446 authored by Matthew Wilcox (Oracle) on 19 June 2022, 14:37:32 UTC, committed by Matthew Wilcox (Oracle) on 23 June 2022, 16:21:44 UTC 
mm: Clear page->private when splitting or migrating a page
 
In our efforts to remove uses of PG_private, we have found folios with
the private flag clear and folio->private not-NULL.  That is the root
cause behind 642d51fb0775 ("ceph: check folio PG_private bit instead
of folio->private").  It can also affect a few other filesystems that
haven't yet reported a problem.

compaction_alloc() can return a page with uninitialised page->private,
and rather than checking all the callers of migrate_pages(), just zero
page->private after calling get_new_page().  Similarly, the tail pages
from split_huge_page() may also have an uninitialised page->private.

Reported-by: Xiubo Li <xiubli@redhat.com>
Tested-by: Xiubo Li <xiubli@redhat.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
1 parent cb995f4
History
Tip revision: b653db77350c7307a513b81856fe53e94cf42446 authored by Matthew Wilcox (Oracle) on 19 June 2022, 14:37:32 UTC
mm: Clear page->private when splitting or migrating a page
Tip revision: b653db7
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