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Timers and timekeeping updates:

Browse source 
Core code:
 
     - Make the NOHZ handling of the timekeeping/tick core more robust to
       prevent a rare jiffies update stall.
 
     - Handle softirqs in the NOHZ/idle case correctly
 
  Drivers:
 
     - Add support for event stream scaling of the 1GHz counter on ARM(64)
 
     - Correct an error code check in the timer-of layer
 
     - The usual cleanups and improvements all over the place
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Merge tag 'timers-core-2022-03-21' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull timer and timekeeping updates from Thomas Gleixner:
 "Core code:

   - Make the NOHZ handling of the timekeeping/tick core more robust to
     prevent a rare jiffies update stall.

   - Handle softirqs in the NOHZ/idle case correctly

  Drivers:

   - Add support for event stream scaling of the 1GHz counter on ARM(64)

   - Correct an error code check in the timer-of layer

   - The usual cleanups and improvements all over the place"

* tag 'timers-core-2022-03-21' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (23 commits)
  lib/irq_poll: Declare IRQ_POLL softirq vector as ksoftirqd-parking safe
  tick/rcu: Stop allowing RCU_SOFTIRQ in idle
  tick/rcu: Remove obsolete rcu_needs_cpu() parameters
  tick: Detect and fix jiffies update stall
  clocksource/drivers/timer-of: Check return value of of_iomap in timer_of_base_init()
  clocksource/drivers/timer-microchip-pit64b: Use 5MHz for clockevent
  clocksource/drivers/timer-microchip-pit64b: Use notrace
  clocksource/drivers/timer-microchip-pit64b: Remove mmio selection
  dt-bindings: timer: Tegra: Convert text bindings to yaml
  clocksource/drivers/imx-tpm: Move tpm_read_sched_clock() under CONFIG_ARM
  clocksource/drivers/arm_arch_timer: Use event stream scaling when available
  clocksource/drivers/exynos_mct: Increase the size of name array
  clocksource/drivers/exynos_mct: Bump up mct max irq number
  clocksource/drivers/exynos_mct: Remove mct interrupt index enum
  clocksource/drivers/exynos_mct: Handle DTS with higher number of interrupts
  clocksource/drivers/timer-ti-dm: Fix regression from errata i940 fix
  clocksource/drivers/imx-tpm: Exclude sched clock for ARM64
  clocksource: Add a Kconfig option for WATCHDOG_MAX_SKEW
  clocksource/drivers/imx-tpm: Update name of clkevt
  clocksource/drivers/imx-tpm: Add CLOCK_EVT_FEAT_DYNIRQ
  ...
This commit is contained in:
Linus Torvalds 2022-03-21 12:53:14 -07:00
commit 84c2e17951
23 changed files with 299 additions and 157 deletions
Download patch file Download diff file Expand all files Collapse all files

11
include/linux/interrupt.h
View file

@ -579,7 +579,16 @@ enum
NR_SOFTIRQS
};
#define SOFTIRQ_STOP_IDLE_MASK (~(1 << RCU_SOFTIRQ))
/*
* The following vectors can be safely ignored after ksoftirqd is parked:
*
* _ RCU:
* 1) rcutree_migrate_callbacks() migrates the queue.
* 2) rcu_report_dead() reports the final quiescent states.
*
* _ IRQ_POLL: irq_poll_cpu_dead() migrates the queue
*/
#define SOFTIRQ_HOTPLUG_SAFE_MASK (BIT(RCU_SOFTIRQ) | BIT(IRQ_POLL_SOFTIRQ))
/* map softirq index to softirq name. update 'softirq_to_name' in
* kernel/softirq.c when adding a new softirq.

3
include/linux/rcutiny.h
View file

@ -64,9 +64,8 @@ static inline void rcu_softirq_qs(void)
rcu_tasks_qs(current, (preempt)); \
} while (0)
static inline int rcu_needs_cpu(u64 basemono, u64 *nextevt)
static inline int rcu_needs_cpu(void)
{
*nextevt = KTIME_MAX;
return 0;
}

2
include/linux/rcutree.h
View file

@ -19,7 +19,7 @@
void rcu_softirq_qs(void);
void rcu_note_context_switch(bool preempt);
int rcu_needs_cpu(u64 basem, u64 *nextevt);
int rcu_needs_cpu(void);
void rcu_cpu_stall_reset(void);
/*