Messages in this thread Patch in this message | | | Date | Tue, 29 Nov 2016 08:48:48 -0800 | From | tip-bot for Thomas Gleixner <> | Subject | [tip:x86/timers] x86/tsc: Move sync cleanup to a safe place |
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Commit-ID: ce68ad5a095f151426cab18cc8fad9c968421da3 Gitweb: http://git.kernel.org/tip/ce68ad5a095f151426cab18cc8fad9c968421da3 Author: Thomas Gleixner <tglx@linutronix.de> AuthorDate: Sat, 19 Nov 2016 13:47:40 +0000 Committer: Thomas Gleixner <tglx@linutronix.de> CommitDate: Tue, 29 Nov 2016 17:29:48 +0100
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>
--- arch/x86/kernel/tsc_sync.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/arch/x86/kernel/tsc_sync.c b/arch/x86/kernel/tsc_sync.c index 1770f60..8642223 100644 --- a/arch/x86/kernel/tsc_sync.c +++ b/arch/x86/kernel/tsc_sync.c @@ -267,11 +267,6 @@ void check_tsc_sync_source(int cpu) } /* - * 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: */ while (atomic_read(&start_count) != cpus - 1) { @@ -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 */
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