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parisc: Use cr16 interval timers unconditionally on qemu

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commit 5ffa851885 upstream.

When running on qemu we know that the (emulated) cr16 cpu-internal
clocks are syncronized. So let's use them unconditionally on qemu.

Signed-off-by: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org # 4.14+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Helge Deller
2018-01-12 22:44:00 +01:00
committed by Greg Kroah-Hartman
parent 32810f94a6
commit 79bedcb095
2 changed files with 3 additions and 1 deletions
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2
arch/parisc/include/asm/processor.h
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@@ -323,6 +323,8 @@ extern int _parisc_requires_coherency;
#define parisc_requires_coherency() (0)
#endif
extern int running_on_qemu;
#endif /* __ASSEMBLY__ */
#endif /* __ASM_PARISC_PROCESSOR_H */

2
arch/parisc/kernel/time.c
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@@ -299,7 +299,7 @@ static int __init init_cr16_clocksource(void)
* The cr16 interval timers are not syncronized across CPUs, so mark
* them unstable and lower rating on SMP systems.
*/
if (num_online_cpus() > 1) {
if (num_online_cpus() > 1 && !running_on_qemu) {
clocksource_cr16.flags = CLOCK_SOURCE_UNSTABLE;
clocksource_cr16.rating = 0;
}