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authorNishanth Aravamudan <nacc@us.ibm.com>2008-02-14 02:03:19 +0300
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-14 03:21:18 +0300
commit064d9efe947542097be669581f82d6b097e81d1a (patch)
treeddfc9f1c4d60135a7d7a1c5ebb7d0e85f683cfcb /mm/hugetlb.c
parent2695a14d315c014474ccadbaed40b0169b00cb5b (diff)
downloadlinux-064d9efe947542097be669581f82d6b097e81d1a.tar.xz
hugetlb: fix overcommit locking
proc_doulongvec_minmax() calls copy_to_user()/copy_from_user(), so we can't hold hugetlb_lock over the call. Use a dummy variable to store the sysctl result, like in hugetlb_sysctl_handler(), then grab the lock to update nr_overcommit_huge_pages. Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com> Reported-by: Miles Lane <miles.lane@gmail.com> Cc: Adam Litke <agl@us.ibm.com> Cc: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/hugetlb.c')
-rw-r--r--mm/hugetlb.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index d9a380312467..cb1b3a7ecdfc 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -24,14 +24,15 @@
const unsigned long hugetlb_zero = 0, hugetlb_infinity = ~0UL;
static unsigned long nr_huge_pages, free_huge_pages, resv_huge_pages;
static unsigned long surplus_huge_pages;
+static unsigned long nr_overcommit_huge_pages;
unsigned long max_huge_pages;
+unsigned long sysctl_overcommit_huge_pages;
static struct list_head hugepage_freelists[MAX_NUMNODES];
static unsigned int nr_huge_pages_node[MAX_NUMNODES];
static unsigned int free_huge_pages_node[MAX_NUMNODES];
static unsigned int surplus_huge_pages_node[MAX_NUMNODES];
static gfp_t htlb_alloc_mask = GFP_HIGHUSER;
unsigned long hugepages_treat_as_movable;
-unsigned long nr_overcommit_huge_pages;
static int hugetlb_next_nid;
/*
@@ -609,8 +610,9 @@ int hugetlb_overcommit_handler(struct ctl_table *table, int write,
struct file *file, void __user *buffer,
size_t *length, loff_t *ppos)
{
- spin_lock(&hugetlb_lock);
proc_doulongvec_minmax(table, write, file, buffer, length, ppos);
+ spin_lock(&hugetlb_lock);
+ nr_overcommit_huge_pages = sysctl_overcommit_huge_pages;
spin_unlock(&hugetlb_lock);
return 0;
}