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| author | Andi Kleen <ak@linux.intel.com> | 2010-10-06 21:45:00 +0200 |
|---|---|---|
| committer | Andi Kleen <ak@linux.intel.com> | 2010-10-08 09:32:46 +0200 |
| commit | aa50d3a7aa8147b9e14dc9d5972a5d2359db4ef8 (patch) | |
| tree | 68fae5060333dcc24c17e9dd00a87bd760d883e9 /mm/memory.c | |
| parent | 6f39ce056ab2ab2d29b2fae4aed61ed0b485972f (diff) | |
| download | linux-aa50d3a7aa8147b9e14dc9d5972a5d2359db4ef8.tar.bz2 | |
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.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/memory.c b/mm/memory.c index 0e18b4d649ec..c2d6dd315659 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(); } |