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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2012-01-10 15:07:22 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-01-10 16:30:42 -0800
commit1e16a539ac16e7b3a8c2cee188897d4bdb88e6e8 (patch)
tree12ee5589d6a04d54fc89c7970b6b8e5012d5e74f /mm
parentef009b25f4f8a77d2b32067d424d5ac757dcdc5b (diff)
downloadop-kernel-dev-1e16a539ac16e7b3a8c2cee188897d4bdb88e6e8.zip
op-kernel-dev-1e16a539ac16e7b3a8c2cee188897d4bdb88e6e8.tar.gz
mm/hugetlb.c: fix virtual address handling in hugetlb fault
handle_mm_fault() passes 'faulted' address to hugetlb_fault(). This address is not aligned to a hugepage boundary. Most of the functions for hugetlb pages are aware of that and calculate an alignment themselves. However some functions such as copy_user_huge_page() and clear_huge_page() don't handle alignment by themselves. This patch make hugeltb_fault() fix the alignment and pass an aligned addresss (to address of a faulted hugepage) to functions. [akpm@linux-foundation.org: use &=] Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/hugetlb.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 49e693b..ab89d6f 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2640,6 +2640,8 @@ int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
static DEFINE_MUTEX(hugetlb_instantiation_mutex);
struct hstate *h = hstate_vma(vma);
+ address &= huge_page_mask(h);
+
ptep = huge_pte_offset(mm, address);
if (ptep) {
entry = huge_ptep_get(ptep);
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