From 5c3c2ea6887176c5ae812c9f0350ff65b10e9485 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Wed, 17 May 2017 22:39:24 +0200 Subject: [PATCH] x86/tsc: Fold set_cyc2ns_scale() into caller The newly introduced wrapper function only has one caller, and this one is conditional, causing a harmless warning when CONFIG_CPU_FREQ is disabled: arch/x86/kernel/tsc.c:189:13: error: 'set_cyc2ns_scale' defined but not used [-Werror=unused-function] My first idea was to move the wrapper inside of that #ifdef, but on second thought it seemed nicer to remove it completely again and rename __set_cyc2ns_scale back to set_cyc2ns_scale, but leaving the extra argument. Signed-off-by: Arnd Bergmann Acked-by: Peter Zijlstra Cc: Linus Torvalds Cc: Prarit Bhargava Cc: Thomas Gleixner Fixes: 615cd03373a0 ("x86/tsc: Fix sched_clock() sync") Link: http://lkml.kernel.org/r/20170517203949.2052220-1-arnd@arndb.de Signed-off-by: Ingo Molnar --- arch/x86/kernel/tsc.c | 14 ++++---------- 1 file changed, 4 insertions(+), 10 deletions(-) diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c index a3b5442..5270fc0 100644 --- a/arch/x86/kernel/tsc.c +++ b/arch/x86/kernel/tsc.c @@ -137,7 +137,7 @@ static inline unsigned long long cycles_2_ns(unsigned long long cyc) return ns; } -static void __set_cyc2ns_scale(unsigned long khz, int cpu, unsigned long long tsc_now) +static void set_cyc2ns_scale(unsigned long khz, int cpu, unsigned long long tsc_now) { unsigned long long ns_now; struct cyc2ns_data data; @@ -186,11 +186,6 @@ done: local_irq_restore(flags); } -static void set_cyc2ns_scale(unsigned long khz, int cpu) -{ - __set_cyc2ns_scale(khz, cpu, rdtsc()); -} - /* * Scheduler clock - returns current time in nanosec units. */ @@ -892,7 +887,6 @@ void tsc_restore_sched_clock_state(void) } #ifdef CONFIG_CPU_FREQ - /* Frequency scaling support. Adjust the TSC based timer when the cpu frequency * changes. * @@ -933,7 +927,7 @@ static int time_cpufreq_notifier(struct notifier_block *nb, unsigned long val, if (!(freq->flags & CPUFREQ_CONST_LOOPS)) mark_tsc_unstable("cpufreq changes"); - set_cyc2ns_scale(tsc_khz, freq->cpu); + set_cyc2ns_scale(tsc_khz, freq->cpu, rdtsc()); } return 0; @@ -1224,7 +1218,7 @@ static void tsc_refine_calibration_work(struct work_struct *work) /* Update the sched_clock() rate to match the clocksource one */ for_each_possible_cpu(cpu) - __set_cyc2ns_scale(tsc_khz, cpu, tsc_stop); + set_cyc2ns_scale(tsc_khz, cpu, tsc_stop); out: if (boot_cpu_has(X86_FEATURE_ART)) @@ -1314,7 +1308,7 @@ void __init tsc_init(void) cyc = rdtsc(); for_each_possible_cpu(cpu) { cyc2ns_init(cpu); - __set_cyc2ns_scale(tsc_khz, cpu, cyc); + set_cyc2ns_scale(tsc_khz, cpu, cyc); } if (tsc_disabled > 0) -- 2.7.4