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authorAnna-Maria Behnsen <anna-maria@linutronix.de>2024-02-21 10:05:45 +0100
committerThomas Gleixner <tglx@linutronix.de>2024-02-22 17:52:32 +0100
commit57e95a5c4117dc6a67dc416d82079c02dab7e983 (patch)
tree0f9b7387173ff258410bf5b2df18bb9cacb2dcac /kernel
parenttick/sched: Split out jiffies update helper function (diff)
downloadlinux-57e95a5c4117dc6a67dc416d82079c02dab7e983.tar.xz
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')
-rw-r--r--kernel/time/tick-internal.h1
-rw-r--r--kernel/time/timer.c10
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,