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authorThomas Gleixner <tglx@linutronix.de>2022-11-23 21:18:42 +0100
committerThomas Gleixner <tglx@linutronix.de>2022-11-24 15:09:11 +0100
commit168f6b6ffbeec0b9333f3582e4cf637300858db5 (patch)
tree1f79a7bbc955782256c32d25d1f071646b414d8f /kernel/time
parent14f043f1340bf30bc60af127bff39f55889fef26 (diff)
timers: Use del_timer_sync() even on UP
del_timer_sync() is assumed to be pointless on uniprocessor systems and can be mapped to del_timer() because in theory del_timer() can never be invoked while the timer callback function is executed. This is not entirely true because del_timer() can be invoked from interrupt context and therefore hit in the middle of a running timer callback. Contrary to that del_timer_sync() is not allowed to be invoked from interrupt context unless the affected timer is marked with TIMER_IRQSAFE. del_timer_sync() has proper checks in place to detect such a situation. Give up on the UP optimization and make del_timer_sync() unconditionally available. Co-developed-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Jacob Keller <jacob.e.keller@intel.com> Reviewed-by: Anna-Maria Behnsen <anna-maria@linutronix.de> Link: https://lore.kernel.org/all/20220407161745.7d6754b3@gandalf.local.home Link: https://lore.kernel.org/all/20221110064101.429013735@goodmis.org Link: https://lore.kernel.org/r/20221123201624.888306160@linutronix.de
Diffstat (limited to 'kernel/time')
-rw-r--r--kernel/time/timer.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index ea0150c366fe..550f0df3a2aa 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -1396,7 +1396,6 @@ static inline void timer_sync_wait_running(struct timer_base *base) { }
static inline void del_timer_wait_running(struct timer_list *timer) { }
#endif
-#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT)
/**
* del_timer_sync - Deactivate a timer and wait for the handler to finish.
* @timer: The timer to be deactivated
@@ -1477,7 +1476,6 @@ int del_timer_sync(struct timer_list *timer)
return ret;
}
EXPORT_SYMBOL(del_timer_sync);
-#endif
static void call_timer_fn(struct timer_list *timer,
void (*fn)(struct timer_list *),