Commit af0db981 authored Oct 13, 2017 by Zi Yan Committed by Linus Torvalds Oct 13, 2017

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: 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>

parent de55c8b2

mm/page_vma_mapped.c

+1 −2

Original line number	Original line	Diff line number	Diff line
	@@ -167,8 +167,7 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw)
	return not_found(pvmw);		return not_found(pvmw);
	return true;		return true;
	}		}
	} else		}
	WARN_ONCE(1, "Non present huge pmd without pmd migration enabled!");
	return not_found(pvmw);		return not_found(pvmw);
	} else {		} else {
	/* THP pmd was split under us: handle on pte level */		/* THP pmd was split under us: handle on pte level */