[glsdk/meta-ti-glsdk.git] / recipes-kernel / linux / linux-ti33x-psp-3.2 / 3.2.25 / 0016-mm-hugetlb-fix-warning-in-alloc_huge_page-dequeue_hu.patch
1 From f9871f8705a930f3c3c4588a8c990cf76db2b95e Mon Sep 17 00:00:00 2001
2 From: Konstantin Khlebnikov <khlebnikov@openvz.org>
3 Date: Wed, 25 Apr 2012 16:01:46 -0700
4 Subject: [PATCH 16/73] mm/hugetlb: fix warning in
5 alloc_huge_page/dequeue_huge_page_vma
7 commit b1c12cbcd0a02527c180a862e8971e249d3b347d upstream.
9 Stable note: Not tracked in Bugzilla. [get|put]_mems_allowed() is extremely
10 expensive and severely impacted page allocator performance. This
11 is part of a series of patches that reduce page allocator overhead.
13 Fix a gcc warning (and bug?) introduced in cc9a6c877 ("cpuset: mm: reduce
14 large amounts of memory barrier related damage v3")
16 Local variable "page" can be uninitialized if the nodemask from vma policy
17 does not intersects with nodemask from cpuset. Even if it doesn't happens
18 it is better to initialize this variable explicitly than to introduce
19 a kernel oops in a weird corner case.
21 mm/hugetlb.c: In function `alloc_huge_page':
22 mm/hugetlb.c:1135:5: warning: `page' may be used uninitialized in this function
24 Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
25 Acked-by: Mel Gorman <mgorman@suse.de>
26 Acked-by: David Rientjes <rientjes@google.com>
27 Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
28 Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
29 Signed-off-by: Mel Gorman <mgorman@suse.de>
30 Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
31 ---
32 mm/hugetlb.c | 2 +-
33 1 files changed, 1 insertions(+), 1 deletions(-)
35 diff --git a/mm/hugetlb.c b/mm/hugetlb.c
36 index 1e747e4..b1e1bad 100644
37 --- a/mm/hugetlb.c
38 +++ b/mm/hugetlb.c
39 @@ -532,7 +532,7 @@ static struct page *dequeue_huge_page_vma(struct hstate *h,
40 struct vm_area_struct *vma,
41 unsigned long address, int avoid_reserve)
42 {
43 - struct page *page;
44 + struct page *page = NULL;
45 struct mempolicy *mpol;
46 nodemask_t *nodemask;
47 struct zonelist *zonelist;
48 --
49 1.7.7.6