Messages in this thread Patch in this message | | | Date | Sun, 14 Jan 2018 03:44:19 -0800 | From | tip-bot for Len Brown <> | Subject | [tip:x86/urgent] x86/tsc: Print tsc_khz, when it differs from cpu_khz |
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Commit-ID: 4b5b2127238e689ee18aa6752959751dd61c4c73 Gitweb: https://git.kernel.org/tip/4b5b2127238e689ee18aa6752959751dd61c4c73 Author: Len Brown <len.brown@intel.com> AuthorDate: Fri, 22 Dec 2017 00:27:56 -0500 Committer: Thomas Gleixner <tglx@linutronix.de> CommitDate: Sun, 14 Jan 2018 12:14:50 +0100
x86/tsc: Print tsc_khz, when it differs from cpu_khz
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
--- arch/x86/kernel/tsc.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c index 3bf4df7..e169e85 100644 --- a/arch/x86/kernel/tsc.c +++ b/arch/x86/kernel/tsc.c @@ -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);
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