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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>
This commit is contained in:
Andi Kleen 2009-09-16 11:50:08 +02:00 committed by Andi Kleen
parent d1737fdbec
commit a3b947eacf
1 changed files with 6 additions and 0 deletions
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6
mm/memory.c
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@ -2711,6 +2711,12 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE)))
return ret;
if (unlikely(PageHWPoison(vmf.page))) {
if (ret & VM_FAULT_LOCKED)
unlock_page(vmf.page);
return VM_FAULT_HWPOISON;
}
/*
* For consistency in subsequent calls, make the faulted page always
* locked.