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This commit has been processed because it contains a "Fixes:" tag
fixing commit: 84c3fc4e9c56 ("mm: thp: check pmd migration entry in common
path").
The bot has tested the following trees: v5.8.6, v5.4.62, v4.19.143, v4.14.196.
v5.8.6: Build OK!
v5.4.62: Failed
A migrating transparent huge page has to already be unmapped. Otherwise,
the page could be modified while it is being copied to a new page and
data could be lost. The function __split_huge_pmd() checks for a PMD
migration entry before calling __split_huge_pmd_locked() leading one to
think that
