[PATCH] hrtimer: fix up unlocked access to wall_to_monotonic

commit f4304ab21513b834c8fe3403927c60c2b81a72d7 (HZ free NTP) moved the
access to wall_to_monotonic in hrtimer_get_softirq_time() out of the
xtime_lock protection.

Move it back into the seq_lock section.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: John Stultz <johnstul@us.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/hrtimer.c

@@ -135,7 +135,7 @@ EXPORT_SYMBOL_GPL(ktime_get_ts);
 static void hrtimer_get_softirq_time(struct hrtimer_cpu_base *base)
 {
 	ktime_t xtim, tomono;
-	struct timespec xts;
+	struct timespec xts, tom;
 	unsigned long seq;
 
 	do {
@@ -145,10 +145,11 @@ static void hrtimer_get_softirq_time(struct hrtimer_cpu_base *base)
 #else
 		xts = xtime;
 #endif
+		tom = wall_to_monotonic;
 	} while (read_seqretry(&xtime_lock, seq));
 
 	xtim = timespec_to_ktime(xts);
-	tomono = timespec_to_ktime(wall_to_monotonic);
+	tomono = timespec_to_ktime(tom);
 	base->clock_base[CLOCK_REALTIME].softirq_time = xtim;
 	base->clock_base[CLOCK_MONOTONIC].softirq_time =
 		ktime_add(xtim, tomono);