+ mm-gupc-stricter-check-on-thp-migration-entry-during-follow_pmd_mask.patch added to -mm tree

[akpm@linux-foundation.org]

The patch titled
     Subject: mm/gup.c: stricter check on THP migration entry during follow_pmd_mask
has been added to the -mm tree.  Its filename is
     mm-gupc-stricter-check-on-thp-migration-entry-during-follow_pmd_mask.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-gupc-stricter-check-on-thp-migration-entry-during-follow_pmd_mask.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-gupc-stricter-check-on-thp-migration-entry-during-follow_pmd_mask.patch

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------------------------------------------------------
From: Li Xinhai <lixinhai.lxh@gmail.com>
Subject: mm/gup.c: stricter check on THP migration entry during follow_pmd_mask

When BUG_ON check for THP migration entry, the existing code only check
thp_migration_supported case, but not for !thp_migration_supported case. 
If !thp_migration_supported() and !pmd_present(), the original code may
dead loop in theory.  To make the BUG_ON check consistent, we need catch
both cases.

Move the BUG_ON check one step earlier, because if the bug happen we
should know it instead of depend on FOLL_MIGRATION been used by caller.

Because pmdval instead of *pmd is read by the is_pmd_migration_entry()
check, the existing code don't help to avoid useless locking within
pmd_migration_entry_wait(), so remove that check.

Link: https://lkml.kernel.org/r/20211217062559.737063-1-lixinhai.lxh@gmail.com
Signed-off-by: Li Xinhai <lixinhai.lxh@gmail.com>
Reviewed-by: "Huang, Ying" <ying.huang@intel.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/gup.c |   13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

--- a/mm/gup.c~mm-gupc-stricter-check-on-thp-migration-entry-during-follow_pmd_mask
+++ a/mm/gup.c
@@ -642,12 +642,17 @@ static struct page *follow_pmd_mask(stru
 	}
 retry:
 	if (!pmd_present(pmdval)) {
+		/*
+		 * Should never reach here, if thp migration is not supported;
+		 * Otherwise, it must be a thp migration entry.
+		 */
+		VM_BUG_ON(!thp_migration_supported() ||
+				  !is_pmd_migration_entry(pmdval));
+
 		if (likely(!(flags & FOLL_MIGRATION)))
 			return no_page_table(vma, flags);
-		VM_BUG_ON(thp_migration_supported() &&
-				  !is_pmd_migration_entry(pmdval));
-		if (is_pmd_migration_entry(pmdval))
-			pmd_migration_entry_wait(mm, pmd);
+
+		pmd_migration_entry_wait(mm, pmd);
 		pmdval = READ_ONCE(*pmd);
 		/*
 		 * MADV_DONTNEED may convert the pmd to null because
_

Patches currently in -mm which might be from lixinhai.lxh@gmail.com are

mm-gupc-stricter-check-on-thp-migration-entry-during-follow_pmd_mask.patch