[34-longterm 049/179] mm: fix ENOSPC returned by handle_mm_fault()

From: Paul Gortmaker
Date: Mon May 14 2012 - 22:23:09 EST

From: Hugh Dickins <hughd@xxxxxxxxxx>

This is a commit scheduled for the next v2.6.34 longterm release.
If you see a problem with using this for longterm, please comment.

commit e0dcd8a05be438b3d2e49ef61441ea3a463663f8 upstream.

Al Viro observes that in the hugetlb case, handle_mm_fault() may return
a value of the kind ENOSPC when its caller is expecting a value of the
kind VM_FAULT_SIGBUS: fix alloc_huge_page()'s failure returns.

Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
Acked-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx>
mm/hugetlb.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 4c9e6bb..2583bbe 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1026,10 +1026,10 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
chg = vma_needs_reservation(h, vma, addr);
if (chg < 0)
- return ERR_PTR(chg);
+ return ERR_PTR(-VM_FAULT_OOM);
if (chg)
if (hugetlb_get_quota(inode->i_mapping, chg))
- return ERR_PTR(-ENOSPC);

page = dequeue_huge_page_vma(h, vma, addr, avoid_reserve);

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