The patch titled
Subject: mm: remove unnecessary WARN_ONCE in page_vma_mapped_walk().
has been added to the -mm tree. Its filename is
mm-remove-unnecessary-warn_once-in-page_vma_mapped_walk.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-remove-unnecessary-warn_once-in-page_vma_mapped_walk.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-remove-unnecessary-warn_once-in-page_vma_mapped_walk.patch
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------------------------------------------------------
From: Zi Yan <zi.yan@xxxxxxxxxxxxxx>
Subject: mm: remove unnecessary WARN_ONCE in page_vma_mapped_walk().
A non present pmd entry can appear after pmd_lock is taken in
page_vma_mapped_walk(), even if THP migration is not enabled. The
WARN_ONCE is unnecessary.
Link: http://lkml.kernel.org/r/20171003142606.12324-1-zi.yan@xxxxxxxx
Fixes: 616b8371539a ("mm: thp: enable thp migration in generic path")
Signed-off-by: Zi Yan <zi.yan@xxxxxxxxxxxxxx>
Reported-by: Abdul Haleem <abdhalee@xxxxxxxxxxxxxxxxxx>
Tested-by: Abdul Haleem <abdhalee@xxxxxxxxxxxxxxxxxx>
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_vma_mapped.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff -puN mm/page_vma_mapped.c~mm-remove-unnecessary-warn_once-in-page_vma_mapped_walk mm/page_vma_mapped.c
--- a/mm/page_vma_mapped.c~mm-remove-unnecessary-warn_once-in-page_vma_mapped_walk
+++ a/mm/page_vma_mapped.c
@@ -167,8 +167,7 @@ restart:
return not_found(pvmw);
return true;
}
- } else
- WARN_ONCE(1, "Non present huge pmd without pmd migration enabled!");
+ }
return not_found(pvmw);
} else {
/* THP pmd was split under us: handle on pte level */
_
Patches currently in -mm which might be from zi.yan@xxxxxxxxxxxxxx are
mm-remove-unnecessary-warn_once-in-page_vma_mapped_walk.patch
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