From: Zi Yan <zi.yan@cs.rutgers.edu> Date: Fri, 13 Oct 2017 22:57:47 +0000 (-0700) Subject: mm: remove unnecessary WARN_ONCE in page_vma_mapped_walk(). X-Git-Tag: baikal/aarch64/sdk6.1~15725^2~12 X-Git-Url: https://git.baikalelectronics.ru/sdk/?a=commitdiff_plain;h=215d305306a56bfd0d32918a1fcaf5fb1ebd82cf;p=kernel.git 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: 01235b97554c ("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> --- diff --git a/mm/page_vma_mapped.c b/mm/page_vma_mapped.c index 6a03946469a99..eb462e7db0a95 100644 --- a/mm/page_vma_mapped.c +++ b/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 */