| Message ID | 20230112195540.312601331@infradead.org (mailing list archive) |
|---|---|
| State | Handled Elsewhere, archived |
| Headers | show |
| Series | cpuidle,rcu: Clean up the mess | expand |
On Thu, Jan 12, 2023 at 08:43:30PM +0100, Peter Zijlstra wrote: > The __cpuidle functions will become a noinstr class, as such they need > explicit annotations. > > Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> > Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > Acked-by: Frederic Weisbecker <frederic@kernel.org> > Tested-by: Tony Lindgren <tony@atomide.com> > Tested-by: Ulf Hansson <ulf.hansson@linaro.org> > --- > drivers/cpuidle/poll_state.c | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) > > --- a/drivers/cpuidle/poll_state.c > +++ b/drivers/cpuidle/poll_state.c > @@ -13,7 +13,10 @@ > static int __cpuidle poll_idle(struct cpuidle_device *dev, > struct cpuidle_driver *drv, int index) > { > - u64 time_start = local_clock(); > + u64 time_start; > + > + instrumentation_begin(); > + time_start = local_clock(); > > dev->poll_time_limit = false; > > @@ -39,6 +42,7 @@ static int __cpuidle poll_idle(struct cp > raw_local_irq_disable(); > > current_clr_polling(); > + instrumentation_end(); > > return index; > } Pff, this patch is garbage. However wrote it didn't have his brain engaged :/ Something like the below fixes it, but I still need to build me funny configs like ia64 and paravirt to see if I didn't wreck me something... diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c index a78e73da4a74..70c07e11caa6 100644 --- a/arch/x86/kernel/tsc.c +++ b/arch/x86/kernel/tsc.c @@ -215,7 +215,7 @@ static void __init cyc2ns_init_secondary_cpus(void) /* * Scheduler clock - returns current time in nanosec units. */ -u64 native_sched_clock(void) +noinstr u64 native_sched_clock(void) { if (static_branch_likely(&__use_tsc)) { u64 tsc_now = rdtsc(); diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index 500d1720421e..0b00f21cefe3 100644 --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -426,7 +426,7 @@ void cpuidle_reflect(struct cpuidle_device *dev, int index) * @dev: the cpuidle device * */ -u64 cpuidle_poll_time(struct cpuidle_driver *drv, +__cpuidle u64 cpuidle_poll_time(struct cpuidle_driver *drv, struct cpuidle_device *dev) { int i; diff --git a/drivers/cpuidle/poll_state.c b/drivers/cpuidle/poll_state.c index d25ec52846e6..bdcfeaecd228 100644 --- a/drivers/cpuidle/poll_state.c +++ b/drivers/cpuidle/poll_state.c @@ -15,7 +15,6 @@ static int __cpuidle poll_idle(struct cpuidle_device *dev, { u64 time_start; - instrumentation_begin(); time_start = local_clock(); dev->poll_time_limit = false; @@ -42,7 +41,6 @@ static int __cpuidle poll_idle(struct cpuidle_device *dev, raw_local_irq_disable(); current_clr_polling(); - instrumentation_end(); return index; } diff --git a/include/linux/sched/clock.h b/include/linux/sched/clock.h index 867d588314e0..7960f0769884 100644 --- a/include/linux/sched/clock.h +++ b/include/linux/sched/clock.h @@ -45,7 +45,7 @@ static inline u64 cpu_clock(int cpu) return sched_clock(); } -static inline u64 local_clock(void) +static __always_inline u64 local_clock(void) { return sched_clock(); } @@ -79,7 +79,7 @@ static inline u64 cpu_clock(int cpu) return sched_clock_cpu(cpu); } -static inline u64 local_clock(void) +static __always_inline u64 local_clock(void) { return sched_clock_cpu(raw_smp_processor_id()); } diff --git a/kernel/sched/clock.c b/kernel/sched/clock.c index e374c0c923da..6b3b0559e53c 100644 --- a/kernel/sched/clock.c +++ b/kernel/sched/clock.c @@ -260,7 +260,7 @@ notrace 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 */ -notrace static u64 sched_clock_local(struct sched_clock_data *scd) +noinstr static u64 sched_clock_local(struct sched_clock_data *scd) { u64 now, clock, old_clock, min_clock, max_clock, gtod; s64 delta; @@ -287,7 +287,7 @@ notrace static u64 sched_clock_local(struct sched_clock_data *scd) clock = wrap_max(clock, min_clock); clock = wrap_min(clock, max_clock); - if (!try_cmpxchg64(&scd->clock, &old_clock, clock)) + if (!arch_try_cmpxchg64(&scd->clock, &old_clock, clock)) goto again; return clock; @@ -360,7 +360,7 @@ notrace static u64 sched_clock_remote(struct sched_clock_data *scd) * * See cpu_clock(). */ -notrace u64 sched_clock_cpu(int cpu) +noinstr u64 sched_clock_cpu(int cpu) { struct sched_clock_data *scd; u64 clock;
--- a/drivers/cpuidle/poll_state.c +++ b/drivers/cpuidle/poll_state.c @@ -13,7 +13,10 @@ static int __cpuidle poll_idle(struct cpuidle_device *dev, struct cpuidle_driver *drv, int index) { - u64 time_start = local_clock(); + u64 time_start; + + instrumentation_begin(); + time_start = local_clock(); dev->poll_time_limit = false; @@ -39,6 +42,7 @@ static int __cpuidle poll_idle(struct cp raw_local_irq_disable(); current_clr_polling(); + instrumentation_end(); return index; }