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>

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();
                                 }