From fa28abed7a84f5c9902fe28b3bb58f7900583e83 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Mon, 21 Jun 2021 08:41:43 +0200 Subject: [PATCH] sched/headers: sched/clock: Mark all functions 'notrace', remove CC_FLAGS_FTRACE build asymmetry Mark all non-init functions in kernel/sched.c as 'notrace', instead of turning them all off via CC_FLAGS_FTRACE. This is going to allow the treatment of this file as any other scheduler file, and it can be #include-ed in compound compilation units as well. Signed-off-by: Ingo Molnar Reviewed-by: Peter Zijlstra --- kernel/sched/Makefile | 3 --- kernel/sched/clock.c | 42 +++++++++++++++++++++--------------------- 2 files changed, 21 insertions(+), 24 deletions(-) diff --git a/kernel/sched/Makefile b/kernel/sched/Makefile index c83b37af..c0c5202 100644 --- a/kernel/sched/Makefile +++ b/kernel/sched/Makefile @@ -1,7 +1,4 @@ # SPDX-License-Identifier: GPL-2.0 -ifdef CONFIG_FUNCTION_TRACER -CFLAGS_REMOVE_clock.o = $(CC_FLAGS_FTRACE) -endif # The compilers are complaining about unused variables inside an if(0) scope # block. This is daft, shut them up. diff --git a/kernel/sched/clock.c b/kernel/sched/clock.c index c2b2859..540d0e5 100644 --- a/kernel/sched/clock.c +++ b/kernel/sched/clock.c @@ -61,7 +61,7 @@ * This is default implementation. * Architectures and sub-architectures can override this. */ -unsigned long long __weak sched_clock(void) +notrace unsigned long long __weak sched_clock(void) { return (unsigned long long)(jiffies - INITIAL_JIFFIES) * (NSEC_PER_SEC / HZ); @@ -95,28 +95,28 @@ struct sched_clock_data { static DEFINE_PER_CPU_SHARED_ALIGNED(struct sched_clock_data, sched_clock_data); -static inline struct sched_clock_data *this_scd(void) +notrace static inline struct sched_clock_data *this_scd(void) { return this_cpu_ptr(&sched_clock_data); } -static inline struct sched_clock_data *cpu_sdc(int cpu) +notrace static inline struct sched_clock_data *cpu_sdc(int cpu) { return &per_cpu(sched_clock_data, cpu); } -int sched_clock_stable(void) +notrace int sched_clock_stable(void) { return static_branch_likely(&__sched_clock_stable); } -static void __scd_stamp(struct sched_clock_data *scd) +notrace static void __scd_stamp(struct sched_clock_data *scd) { scd->tick_gtod = ktime_get_ns(); scd->tick_raw = sched_clock(); } -static void __set_sched_clock_stable(void) +notrace static void __set_sched_clock_stable(void) { struct sched_clock_data *scd; @@ -151,7 +151,7 @@ static void __set_sched_clock_stable(void) * The only way to fully avoid random clock jumps is to boot with: * "tsc=unstable". */ -static void __sched_clock_work(struct work_struct *work) +notrace static void __sched_clock_work(struct work_struct *work) { struct sched_clock_data *scd; int cpu; @@ -177,7 +177,7 @@ static void __sched_clock_work(struct work_struct *work) static DECLARE_WORK(sched_clock_work, __sched_clock_work); -static void __clear_sched_clock_stable(void) +notrace static void __clear_sched_clock_stable(void) { if (!sched_clock_stable()) return; @@ -186,7 +186,7 @@ static void __clear_sched_clock_stable(void) schedule_work(&sched_clock_work); } -void clear_sched_clock_stable(void) +notrace void clear_sched_clock_stable(void) { __sched_clock_stable_early = 0; @@ -196,7 +196,7 @@ void clear_sched_clock_stable(void) __clear_sched_clock_stable(); } -static void __sched_clock_gtod_offset(void) +notrace static void __sched_clock_gtod_offset(void) { struct sched_clock_data *scd = this_scd(); @@ -246,12 +246,12 @@ late_initcall(sched_clock_init_late); * min, max except they take wrapping into account */ -static inline u64 wrap_min(u64 x, u64 y) +notrace static inline u64 wrap_min(u64 x, u64 y) { return (s64)(x - y) < 0 ? x : y; } -static inline u64 wrap_max(u64 x, u64 y) +notrace static inline u64 wrap_max(u64 x, u64 y) { return (s64)(x - y) > 0 ? x : y; } @@ -262,7 +262,7 @@ static inline u64 wrap_max(u64 x, u64 y) * - filter out backward motion * - use the GTOD tick value to create a window to filter crazy TSC values */ -static u64 sched_clock_local(struct sched_clock_data *scd) +notrace static u64 sched_clock_local(struct sched_clock_data *scd) { u64 now, clock, old_clock, min_clock, max_clock, gtod; s64 delta; @@ -295,7 +295,7 @@ again: return clock; } -static u64 sched_clock_remote(struct sched_clock_data *scd) +notrace static u64 sched_clock_remote(struct sched_clock_data *scd) { struct sched_clock_data *my_scd = this_scd(); u64 this_clock, remote_clock; @@ -362,7 +362,7 @@ again: * * See cpu_clock(). */ -u64 sched_clock_cpu(int cpu) +notrace u64 sched_clock_cpu(int cpu) { struct sched_clock_data *scd; u64 clock; @@ -386,7 +386,7 @@ u64 sched_clock_cpu(int cpu) } EXPORT_SYMBOL_GPL(sched_clock_cpu); -void sched_clock_tick(void) +notrace void sched_clock_tick(void) { struct sched_clock_data *scd; @@ -403,7 +403,7 @@ void sched_clock_tick(void) sched_clock_local(scd); } -void sched_clock_tick_stable(void) +notrace void sched_clock_tick_stable(void) { if (!sched_clock_stable()) return; @@ -423,7 +423,7 @@ void sched_clock_tick_stable(void) /* * We are going deep-idle (irqs are disabled): */ -void sched_clock_idle_sleep_event(void) +notrace void sched_clock_idle_sleep_event(void) { sched_clock_cpu(smp_processor_id()); } @@ -432,7 +432,7 @@ EXPORT_SYMBOL_GPL(sched_clock_idle_sleep_event); /* * We just idled; resync with ktime. */ -void sched_clock_idle_wakeup_event(void) +notrace void sched_clock_idle_wakeup_event(void) { unsigned long flags; @@ -458,7 +458,7 @@ void __init sched_clock_init(void) local_irq_enable(); } -u64 sched_clock_cpu(int cpu) +notrace u64 sched_clock_cpu(int cpu) { if (!static_branch_likely(&sched_clock_running)) return 0; @@ -476,7 +476,7 @@ u64 sched_clock_cpu(int cpu) * On bare metal this function should return the same as local_clock. * Architectures and sub-architectures can override this. */ -u64 __weak running_clock(void) +notrace u64 __weak running_clock(void) { return local_clock(); } -- 2.7.4