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authorAndi Kleen <andi@firstfloor.org>2009-09-16 05:50:08 -0400
committerAndi Kleen <ak@linux.intel.com>2009-09-16 05:50:08 -0400
commita3b947eacfe783df4ca0fe53ef8a764eebc2d0d6 (patch)
treeabd4d972730838708cc9e81ccd8a24b99c0db2f3 /mm
parentd1737fdbec7f90edc52dd0c5c3767457f28e78d8 (diff)
HWPOISON: Add poison check to page fault handling
Bail out early when hardware poisoned pages are found in page fault handling. Since they are poisoned they should not be mapped freshly into processes, because that would cause another (potentially deadly) machine check This is generally handled in the same way as OOM, just a different error code is returned to the architecture code. v2: Do a page unlock if needed (Fengguang Wu) Signed-off-by: Andi Kleen <ak@linux.intel.com>
Diffstat (limited to 'mm')
-rw-r--r--mm/memory.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 02bae2d540d4..44ea41196c13 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2711,6 +2711,12 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
2711 if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE))) 2711 if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE)))
2712 return ret; 2712 return ret;
2713 2713
2714 if (unlikely(PageHWPoison(vmf.page))) {
2715 if (ret & VM_FAULT_LOCKED)
2716 unlock_page(vmf.page);
2717 return VM_FAULT_HWPOISON;
2718 }
2719
2714 /* 2720 /*
2715 * For consistency in subsequent calls, make the faulted page always 2721 * For consistency in subsequent calls, make the faulted page always
2716 * locked. 2722 * locked.