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Matthew Wilcox (Oracle) authored
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 642d51fb ("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>
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