diff --git a/[refs] b/[refs]
index 74563865b6e6..c36c13da43c8 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 1017769bd0073f0a73e066377cd79a10cf0a33ab
+refs/heads/master: 1b2852b152be5150fbef7b585388ec43cf6f4415
diff --git a/trunk/arch/ia64/kernel/time.c b/trunk/arch/ia64/kernel/time.c
index c9a7d2ebe089..b1995efbfd21 100644
--- a/trunk/arch/ia64/kernel/time.c
+++ b/trunk/arch/ia64/kernel/time.c
@@ -119,6 +119,8 @@ static cputime_t vtime_delta(struct task_struct *tsk)
 	cputime_t delta_stime;
 	__u64 now;
 
+	WARN_ON_ONCE(!irqs_disabled());
+
 	now = ia64_get_itc();
 
 	delta_stime = cycle_to_cputime(ti->ac_stime + (now - ti->ac_stamp));
diff --git a/trunk/arch/powerpc/kernel/time.c b/trunk/arch/powerpc/kernel/time.c
index 3486cfad4a63..b3b14352b05e 100644
--- a/trunk/arch/powerpc/kernel/time.c
+++ b/trunk/arch/powerpc/kernel/time.c
@@ -297,6 +297,8 @@ static u64 vtime_delta(struct task_struct *tsk,
 	u64 now, nowscaled, deltascaled;
 	u64 udelta, delta, user_scaled;
 
+	WARN_ON_ONCE(!irqs_disabled());
+
 	now = mftb();
 	nowscaled = read_spurr(now);
 	get_paca()->system_time += now - get_paca()->starttime;
diff --git a/trunk/arch/s390/kernel/vtime.c b/trunk/arch/s390/kernel/vtime.c
index 7c6d861a1a40..e84b8b68444a 100644
--- a/trunk/arch/s390/kernel/vtime.c
+++ b/trunk/arch/s390/kernel/vtime.c
@@ -132,6 +132,8 @@ void vtime_account(struct task_struct *tsk)
 	struct thread_info *ti = task_thread_info(tsk);
 	u64 timer, system;
 
+	WARN_ON_ONCE(!irqs_disabled());
+
 	timer = S390_lowcore.last_update_timer;
 	S390_lowcore.last_update_timer = get_vtimer();
 	S390_lowcore.system_timer += timer - S390_lowcore.last_update_timer;