[PATCH] [7/16] HWPOISON: Add various poison checks in mm/memory.c

From: Andi Kleen
Date: Fri May 29 2009 - 17:36:51 EST

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.

Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>

mm/memory.c | 3 +++
1 file changed, 3 insertions(+)

Index: linux/mm/memory.c
--- linux.orig/mm/memory.c 2009-05-29 23:32:10.000000000 +0200
+++ linux/mm/memory.c 2009-05-29 23:32:10.000000000 +0200
@@ -2659,6 +2659,9 @@
if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE)))
return ret;

+ if (unlikely(PageHWPoison(vmf.page)))
* For consistency in subsequent calls, make the faulted page always
* locked.
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