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authorAndi Kleen <ak@linux.intel.com>2010-10-06 21:45:00 +0200
committerAndi Kleen <ak@linux.intel.com>2010-10-08 09:32:46 +0200
commitaa50d3a7aa8147b9e14dc9d5972a5d2359db4ef8 (patch)
tree68fae5060333dcc24c17e9dd00a87bd760d883e9 /mm/memory.c
parent6f39ce056ab2ab2d29b2fae4aed61ed0b485972f (diff)
Encode huge page size for VM_FAULT_HWPOISON errors
This fixes a problem introduced with the hugetlb hwpoison handling The user space SIGBUS signalling wants to know the size of the hugepage that caused a HWPOISON fault. Unfortunately the architecture page fault handlers do not have easy access to the struct page. Pass the information out in the fault error code instead. I added a separate VM_FAULT_HWPOISON_LARGE bit for this case and encode the hpage index in some free upper bits of the fault code. The small page hwpoison keeps stays with the VM_FAULT_HWPOISON name to minimize changes. Also add code to hugetlb.h to convert that index into a page shift. Will be used in a further patch. Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: fengguang.wu@intel.com Signed-off-by: Andi Kleen <ak@linux.intel.com>
Diffstat (limited to 'mm/memory.c')
-rw-r--r--mm/memory.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 0e18b4d649e..c2d6dd31565 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1450,7 +1450,8 @@ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
if (ret & VM_FAULT_OOM)
return i ? i : -ENOMEM;
if (ret &
- (VM_FAULT_HWPOISON|VM_FAULT_SIGBUS))
+ (VM_FAULT_HWPOISON|VM_FAULT_HWPOISON_LARGE|
+ VM_FAULT_SIGBUS))
return i ? i : -EFAULT;
BUG();
}