parisc: Mark sched_clock unstable only if clocks are not syncronized

We check at runtime if the cr16 clocks are stable across CPUs. Only mark
the sched_clock unstable by calling clear_sched_clock_stable() if we
know that we run on a system which isn't syncronized across CPUs.

Signed-off-by: Helge Deller <[email protected]>

Author: hdeller

arch/parisc/kernel/setup.c

@@ -150,8 +150,6 @@ void __init setup_arch(char **cmdline_p)
 #ifdef CONFIG_PA11
 	dma_ops_init();
 #endif
-
-	clear_sched_clock_stable();
 }
 
 /*

arch/parisc/kernel/time.c

@@ -265,17 +265,16 @@ static int __init init_cr16_clocksource(void)
 			    (cpu0_loc == per_cpu(cpu_data, cpu).cpu_loc))
 				continue;
 
+			/* mark sched_clock unstable */
+			clear_sched_clock_stable();
+
 			clocksource_cr16.name = "cr16_unstable";
 			clocksource_cr16.flags = CLOCK_SOURCE_UNSTABLE;
 			clocksource_cr16.rating = 0;
 			break;
 		}
 	}
 
-	/* XXX: We may want to mark sched_clock stable here if cr16 clocks are
-	 *	in sync:
-	 *	(clocksource_cr16.flags == CLOCK_SOURCE_IS_CONTINUOUS) */
-
 	/* register at clocksource framework */
 	clocksource_register_hz(&clocksource_cr16,
 		100 * PAGE0->mem_10msec);