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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: 616b837153 ("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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Zi Yan 2017-10-13 15:57:47 -07:00 committed by Linus Torvalds
parent de55c8b251
commit af0db981f3
1 changed files with 1 additions and 2 deletions
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3
mm/page_vma_mapped.c
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@ -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 */