+ mm-remove-unnecessary-warn_once-in-page_vma_mapped_walk.patch added to -mm tree

+ mm-remove-unnecessary-warn_once-in-page_vma_mapped_walk.patch added to -mm tree

[akpm]

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@cs.rutgers.edu>
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@sent.com
Fixes: 616b8371539a ("mm: thp: enable thp migration in generic path")
Signed-off-by: Zi Yan <zi.yan@cs.rutgers.edu>
Reported-by: Abdul Haleem <abdhalee@linux.vnet.ibm.com>
Tested-by: Abdul Haleem <abdhalee@linux.vnet.ibm.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 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@cs.rutgers.edu are

mm-remove-unnecessary-warn_once-in-page_vma_mapped_walk.patch