Commit 4c5e3c63 authored Nov 19, 2016 by Thomas Gleixner

x86/tsc: Move sync cleanup to a safe place



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>

parent a36f5136

arch/x86/kernel/tsc_sync.c

+5 −5

Original line number	Diff line number	Diff line
		@@ -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 */

Admin message