hwpoison, hugetlbfs: fix "bad pmd" warning in unmapping hwpoisoned hugepage
authorNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Wed, 12 Dec 2012 21:52:28 +0000 (13:52 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 13 Dec 2012 01:38:35 +0000 (17:38 -0800)
commit8c4894c6bc790d0e31e072202939ac6747bbe7ac
tree9ebb05f3ccb1e5f810f25916cf61a8913eaca1fe
parent4128997b5f0e7ad583a5f3990051b8188b39055c
hwpoison, hugetlbfs: fix "bad pmd" warning in unmapping hwpoisoned hugepage

When a process which used a hwpoisoned hugepage tries to exit() or
munmap(), the kernel can print out "bad pmd" message because page table
walker in free_pgtables() encounters 'hwpoisoned entry' on pmd.

This is because currently we fail to clear the hwpoisoned entry in
__unmap_hugepage_range(), so this patch simply does it.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Andi Kleen <andi.kleen@intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/hugetlb.c