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x86/tsc: Print tsc_khz, when it differs from cpu_khz

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If CPU and TSC frequency are the same the printout of the CPU frequency is
valid for the TSC as well:

      tsc: Detected 2900.000 MHz processor

If the TSC frequency is different there is no information in dmesg. Add a
conditional printout:

  tsc: Detected 2904.000 MHz TSC

Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: peterz@infradead.org
Link: https://lkml.kernel.org/r/537b342debcd8e8aebc8d631015dcdf9f9ba8a26.1513920414.git.len.brown@intel.com
This commit is contained in:
Len Brown 2017-12-22 00:27:56 -05:00 committed by Thomas Gleixner
parent b511203093
commit 4b5b212723
1 changed files with 6 additions and 0 deletions
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6
arch/x86/kernel/tsc.c
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@ -1316,6 +1316,12 @@ void __init tsc_init(void)
(unsigned long)cpu_khz / 1000,
(unsigned long)cpu_khz % 1000);
if (cpu_khz != tsc_khz) {
pr_info("Detected %lu.%03lu MHz TSC",
(unsigned long)tsc_khz / 1000,
(unsigned long)tsc_khz % 1000);
}
/* Sanitize TSC ADJUST before cyc2ns gets initialized */
tsc_store_and_check_tsc_adjust(true);