x86/tsc: Sync test only for the first cpu in a package

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If the TSC_ADJUST MSR is available all CPUs in a package are forced to the
same value. So TSCs cannot be out of sync when the first CPU in the package
was in sync.

That allows to skip the sync test for all CPUs except the first starting
CPU in a package.

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/20161119134017.809901363@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

...

This commit is contained in:

Thomas Gleixner 2016-11-19 13:47:39 +00:00

parent 1d0095feea

commit a36f513681

2 changed files with 30 additions and 11 deletions

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4

arch/x86/include/asm/tsc.h

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37

arch/x86/kernel/tsc_sync.c

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