>From 7c29389be2890c6b6934a80b4841d07a7014fe26 Mon Sep 17 00:00:00 2001
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Date: Mon, 21 Nov 2011 19:45:27 +0900
Subject: [PATCH] Fix virtual address handling in hugetlb fault
handle_mm_fault() passes 'faulted' address to hugetlb_fault().
Then, the address is not aligned to hugepage boundary.
Most of functions for hugetlb pages are aware of that and
calculate an alignment by itself. Some functions as copy_user_huge_page(),
and clear_huge_page() doesn't handle alignment by themselves.
This patch make hugeltb_fault() to calculate the alignment and pass
aligned addresss (top address of a faulted hugepage) to functions.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
---
mm/hugetlb.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index bb28a5f..af37337 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2629,6 +2629,8 @@ 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 = address & huge_page_mask(h);
+
ptep = huge_pte_offset(mm, address);
if (ptep) {
entry = huge_ptep_get(ptep);
--
1.7.4.1
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