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| author | Anna-Maria Behnsen <anna-maria@linutronix.de> | 2024-02-21 10:05:45 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2024-02-22 17:52:32 +0100 |
| commit | 57e95a5c4117dc6a67dc416d82079c02dab7e983 (patch) | |
| tree | 0f9b7387173ff258410bf5b2df18bb9cacb2dcac /kernel/time | |
| parent | 4c532939aa2e9345ee346bc69d3d12d56d5aa9aa (diff) | |
| download | linux-57e95a5c4117dc6a67dc416d82079c02dab7e983.tar.gz linux-57e95a5c4117dc6a67dc416d82079c02dab7e983.tar.bz2 linux-57e95a5c4117dc6a67dc416d82079c02dab7e983.zip | |
timers: Introduce function to check timer base is_idle flag
To prepare for the conversion of the NOHZ timer placement to a pull at
expiry time model it's required to have a function that returns the value
of the is_idle flag of the timer base to keep the hierarchy states during
online in sync with timer base state.
No functional change.
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lore.kernel.org/r/20240221090548.36600-18-anna-maria@linutronix.de
Diffstat (limited to 'kernel/time')
| -rw-r--r-- | kernel/time/tick-internal.h | 1 | ||||
| -rw-r--r-- | kernel/time/timer.c | 10 |
2 files changed, 11 insertions, 0 deletions
diff --git a/kernel/time/tick-internal.h b/kernel/time/tick-internal.h index ccf39befde85..7e3090109e33 100644 --- a/kernel/time/tick-internal.h +++ b/kernel/time/tick-internal.h @@ -165,6 +165,7 @@ extern void fetch_next_timer_interrupt_remote(unsigned long basej, u64 basem, unsigned int cpu); extern void timer_lock_remote_bases(unsigned int cpu); extern void timer_unlock_remote_bases(unsigned int cpu); +extern bool timer_base_is_idle(void); # endif #else /* CONFIG_NO_HZ_COMMON */ static inline void timers_update_nohz(void) { } diff --git a/kernel/time/timer.c b/kernel/time/timer.c index 4420cdf59e8c..e02ac4607985 100644 --- a/kernel/time/timer.c +++ b/kernel/time/timer.c @@ -2159,6 +2159,16 @@ void timer_lock_remote_bases(unsigned int cpu) raw_spin_lock(&base_local->lock); raw_spin_lock_nested(&base_global->lock, SINGLE_DEPTH_NESTING); } + +/** + * timer_base_is_idle() - Return whether timer base is set idle + * + * Returns value of local timer base is_idle value. + */ +bool timer_base_is_idle(void) +{ + return __this_cpu_read(timer_bases[BASE_LOCAL].is_idle); +} # endif /* CONFIG_SMP */ static inline u64 __get_next_timer_interrupt(unsigned long basej, u64 basem, |