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Revert "mm, thp: Do not make pmd/pud dirty without a reason"

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This reverts commit 152e93af3c.

It was a nice cleanup in theory, but as Nicolai Stange points out, we do
need to make the page dirty for the copy-on-write case even when we
didn't end up making it writable, since the dirty bit is what we use to
check that we've gone through a COW cycle.

Reported-by: Michal Hocko <[email protected]>
Acked-by: Kirill A. Shutemov <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Linus Torvalds 2017-11-29 09:01:01 -08:00
commit f55e1014f9
5 changed files with 16 additions and 24 deletions
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2
mm/migrate.c
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@ -2068,7 +2068,7 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm,
}
entry = mk_huge_pmd(new_page, vma->vm_page_prot);
entry = maybe_pmd_mkwrite(entry, vma, false);
entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma);
/*
* Clear the old entry under pagetable lock and establish the new PTE.