Commit af0db981 authored by Zi Yan's avatar Zi Yan Committed by Linus Torvalds

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: 616b8371 ("mm: thp: enable thp migration in generic path")
Signed-off-by: default avatarZi Yan <zi.yan@cs.rutgers.edu>
Reported-by: default avatarAbdul Haleem <abdhalee@linux.vnet.ibm.com>
Tested-by: default avatarAbdul Haleem <abdhalee@linux.vnet.ibm.com>
Acked-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent de55c8b2
......@@ -167,8 +167,7 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw)
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 */
......
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