x86/tsc: Provide a means to disable TSC ART
On systems where multiple chassis are reset asynchronously, and thus the TSC counters are started asynchronously, the offset needed to convert to TSC to ART would be different. Disable ART in that case and rely on the TSC counters to supply the accurate time. Signed-off-by: Mike Travis <mike.travis@hpe.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Cc: Prarit Bhargava <prarit@redhat.com> Cc: Dimitri Sivanich <dimitri.sivanich@hpe.com> Cc: Russ Anderson <russ.anderson@hpe.com> Cc: Andrew Banman <andrew.banman@hpe.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Bin Gao <bin.gao@linux.intel.com> Link: https://lkml.kernel.org/r/20171012163202.289397994@stormcage.americas.sgi.com
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