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Wysocki" , Arjan van de Ven , "Paul E . McKenney" , Frederic Weisbecker , Rik van Riel , Steven Rostedt , Sebastian Siewior , Giovanni Gherdovich , Lukasz Luba , "Gautham R . Shenoy" , Srinivas Pandruvada , K Prateek Nayak , Anna-Maria Behnsen Subject: [PATCH v10 17/20] timers: Introduce function to check timer base is_idle flag Date: Mon, 15 Jan 2024 15:37:40 +0100 Message-Id: <20240115143743.27827-18-anna-maria@linutronix.de> In-Reply-To: <20240115143743.27827-1-anna-maria@linutronix.de> References: <20240115143743.27827-1-anna-maria@linutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1788167839482025401 X-GMAIL-MSGID: 1788167839482025401 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 Reviewed-by: Frederic Weisbecker --- v10: Fix fallout of 0day: Move function definition of timer_base_is_idle() into SMP && NO_HZ_COMMON ifdef section v9: new in v9 --- kernel/time/tick-internal.h | 1 + kernel/time/timer.c | 10 ++++++++++ 2 files changed, 11 insertions(+) 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 eb99297a96fe..3c49d8fdfd53 100644 --- a/kernel/time/timer.c +++ b/kernel/time/timer.c @@ -2099,6 +2099,16 @@ 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,