From 4b5b2127238e689ee18aa6752959751dd61c4c73 Mon Sep 17 00:00:00 2001 From: Len Brown Date: Fri, 22 Dec 2017 00:27:56 -0500 Subject: [PATCH] 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 Signed-off-by: Thomas Gleixner 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 3bf4df7f52d7..e169e85db434 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); -- 2.11.0