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parisc: Mark sched_clock unstable only if clocks are not syncronized

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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 <deller@gmx.de>
This commit is contained in:
Helge Deller 2021-09-08 23:27:00 +02:00
parent 907872baa9
commit d97180ad68
2 changed files with 3 additions and 6 deletions
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2
arch/parisc/kernel/setup.c
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@ -150,8 +150,6 @@ void __init setup_arch(char **cmdline_p)
#ifdef CONFIG_PA11
dma_ops_init();
#endif
clear_sched_clock_stable();
}
/*

7
arch/parisc/kernel/time.c
View file

@ -265,6 +265,9 @@ 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;
@ -272,10 +275,6 @@ static int __init init_cr16_clocksource(void)
}
}
/* 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);