timers: Lower base clock forwarding threshold

There is nothing that prevents from forwarding the base clock if it's one
jiffy off. The reason for this arbitrary limit of two jiffies is historical
and does not longer exist.

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Juri Lelli <juri.lelli@redhat.com>
Link: https://lkml.kernel.org/r/20200717140551.29076-13-frederic@kernel.org

kernel/time/timer.c

@@ -894,7 +894,7 @@ static inline void forward_timer_base(struct timer_base *base)
 	 * Also while executing timers, base->clk is 1 offset ahead
 	 * of jiffies to avoid endless requeuing to current jffies.
 	 */
-	if ((long)(jnow - base->clk) < 2)
+	if ((long)(jnow - base->clk) < 1)
 		return;
 
 	/*