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x86/tsc: Move sync cleanup to a safe place

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Cleaning up the stop marker on the control CPU is wrong when we want to add
retry support. Move the cleanup to the starting CPU.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Link: http://lkml.kernel.org/r/20161119134017.892095627@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2016-11-19 13:47:40 +00:00
parent a36f513681
commit 4c5e3c6375
1 changed files with 5 additions and 5 deletions
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10
arch/x86/kernel/tsc_sync.c
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@ -266,11 +266,6 @@ void check_tsc_sync_source(int cpu)
return;
}
/*
* Reset it - in case this is a second bootup:
*/
atomic_set(&stop_count, 0);
/*
* Wait for the target to start or to skip the test:
*/
@ -360,6 +355,11 @@ void check_tsc_sync_target(void)
*/
while (atomic_read(&stop_count) != cpus)
cpu_relax();
/*
* Reset it for the next sync test:
*/
atomic_set(&stop_count, 0);
}
#endif /* CONFIG_SMP */