lkml.org 
[lkml]   [2018]   [Jan]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[tip:x86/urgent] x86/tsc: Print tsc_khz, when it differs from cpu_khz
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);

\
 
 \ /
  Last update: 2018-01-14 23:27    [W:0.146 / U:0.012 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site