Merge tag 'sched-core-2023-02-20' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull scheduler updates from Ingo Molnar:

 - Improve the scalability of the CFS bandwidth unthrottling logic with
   large number of CPUs.

 - Fix & rework various cpuidle routines, simplify interaction with the
   generic scheduler code. Add __cpuidle methods as noinstr to objtool's
   noinstr detection and fix boatloads of cpuidle bugs & quirks.

 - Add new ABI: introduce MEMBARRIER_CMD_GET_REGISTRATIONS, to query
   previously issued registrations.

 - Limit scheduler slice duration to the sysctl_sched_latency period, to
   improve scheduling granularity with a large number of SCHED_IDLE
   tasks.

 - Debuggability enhancement on sys_exit(): warn about disabled IRQs,
   but also enable them to prevent a cascade of followup problems and
   repeat warnings.

 - Fix the rescheduling logic in prio_changed_dl().

 - Micro-optimize cpufreq and sched-util methods.

 - Micro-optimize ttwu_runnable()

 - Micro-optimize the idle-scanning in update_numa_stats(),
   select_idle_capacity() and steal_cookie_task().

 - Update the RSEQ code & self-tests

 - Constify various scheduler methods

 - Remove unused methods

 - Refine __init tags

 - Documentation updates

 - Misc other cleanups, fixes

* tag 'sched-core-2023-02-20' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (110 commits)
  sched/rt: pick_next_rt_entity(): check list_entry
  sched/deadline: Add more reschedule cases to prio_changed_dl()
  sched/fair: sanitize vruntime of entity being placed
  sched/fair: Remove capacity inversion detection
  sched/fair: unlink misfit task from cpu overutilized
  objtool: mem*() are not uaccess safe
  cpuidle: Fix poll_idle() noinstr annotation
  sched/clock: Make local_clock() noinstr
  sched/clock/x86: Mark sched_clock() noinstr
  x86/pvclock: Improve atomic update of last_value in pvclock_clocksource_read()
  x86/atomics: Always inline arch_atomic64*()
  cpuidle: tracing, preempt: Squash _rcuidle tracing
  cpuidle: tracing: Warn about !rcu_is_watching()
  cpuidle: lib/bug: Disable rcu_is_watching() during WARN/BUG
  cpuidle: drivers: firmware: psci: Dont instrument suspend code
  KVM: selftests: Fix build of rseq test
  exit: Detect and fix irq disabled state in oops
  cpuidle, arm64: Fix the ARM64 cpuidle logic
  cpuidle: mvebu: Fix duplicate flags assignment
  sched/fair: Limit sched slice duration
  ...

2 files changed, 2 insertions, 17 deletions

diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
index 40f70f83daba..15bd1e34a88e 100644
--- a/drivers/perf/arm_pmu.c
+++ b/drivers/perf/arm_pmu.c
@@ -752,17 +752,8 @@ static void cpu_pm_pmu_setup(struct arm_pmu *armpmu, unsigned long cmd)
 		case CPU_PM_ENTER_FAILED:
 			 /*
 			  * Restore and enable the counter.
-			  * armpmu_start() indirectly calls
-			  *
-			  * perf_event_update_userpage()
-			  *
-			  * that requires RCU read locking to be functional,
-			  * wrap the call within RCU_NONIDLE to make the
-			  * RCU subsystem aware this cpu is not idle from
-			  * an RCU perspective for the armpmu_start() call
-			  * duration.
 			  */
-			RCU_NONIDLE(armpmu_start(event, PERF_EF_RELOAD));
+			armpmu_start(event, PERF_EF_RELOAD);
 			break;
 		default:
 			break;
diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c
index f6507efe2a58..7b2288d4b1ec 100644
--- a/drivers/perf/riscv_pmu_sbi.c
+++ b/drivers/perf/riscv_pmu_sbi.c
@@ -771,14 +771,8 @@ static int riscv_pm_pmu_notify(struct notifier_block *b, unsigned long cmd,
 		case CPU_PM_ENTER_FAILED:
 			/*
 			 * Restore and enable the counter.
-			 *
-			 * Requires RCU read locking to be functional,
-			 * wrap the call within RCU_NONIDLE to make the
-			 * RCU subsystem aware this cpu is not idle from
-			 * an RCU perspective for the riscv_pmu_start() call
-			 * duration.
 			 */
-			RCU_NONIDLE(riscv_pmu_start(event, PERF_EF_RELOAD));
+			riscv_pmu_start(event, PERF_EF_RELOAD);
 			break;
 		default:
 			break;