diff --git a/[refs] b/[refs]
index 56d1cba16d4e..26120a1c055b 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: d45e44d4be60ef508579001792f33753b5cb6d36
+refs/heads/master: f0ec1aaf54caddd21c259aea8b2ecfbde4ee4fb9
diff --git a/trunk/kernel/tsacct.c b/trunk/kernel/tsacct.c
index 65a5036a3d95..96f77013d3f0 100644
--- a/trunk/kernel/tsacct.c
+++ b/trunk/kernel/tsacct.c
@@ -80,13 +80,17 @@ void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
  */
 void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
 {
+	struct mm_struct *mm;
+
 	/* convert pages-jiffies to Mbyte-usec */
 	stats->coremem = jiffies_to_usecs(p->acct_rss_mem1) * PAGE_SIZE / MB;
 	stats->virtmem = jiffies_to_usecs(p->acct_vm_mem1) * PAGE_SIZE / MB;
-	if (p->mm) {
+	mm = get_task_mm(p);
+	if (mm) {
 		/* adjust to KB unit */
-		stats->hiwater_rss   = p->mm->hiwater_rss * PAGE_SIZE / KB;
-		stats->hiwater_vm    = p->mm->hiwater_vm * PAGE_SIZE / KB;
+		stats->hiwater_rss   = mm->hiwater_rss * PAGE_SIZE / KB;
+		stats->hiwater_vm    = mm->hiwater_vm * PAGE_SIZE / KB;
+		mmput(mm);
 	}
 	stats->read_char	= p->rchar;
 	stats->write_char	= p->wchar;