mm: remove unnecessary WARN_ONCE in page_vma_mapped_walk().
authorZi Yan <zi.yan@cs.rutgers.edu>
Fri, 13 Oct 2017 22:57:47 +0000 (15:57 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 13 Oct 2017 23:18:32 +0000 (16:18 -0700)
commitaf0db981f35ea99b00a0b249bf0bedef8cf972e8
tree7ad609d0549cc64a4c6763da52793d4464fe0e9b
parentde55c8b251974247edda38e952da8e8dd71683ec
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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/page_vma_mapped.c