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authorIngo Molnar <mingo@kernel.org>2018-02-27 17:48:07 +0100
committerThomas Gleixner <tglx@linutronix.de>2018-03-09 11:50:55 +0100
commit6498ddad301c7a94162915d06d1efe2e5d20f6dc (patch)
treeb823456fd4e12982b6ad59d12192b437d9c30a34
parentf09777fa891327ee0dd892e83619f156bf1c37e6 (diff)
downloadlinux-6498ddad301c7a94162915d06d1efe2e5d20f6dc.tar.bz2
softirq: Consolidate common code in __tasklet_[hi]_schedule()
__tasklet_schedule() and __tasklet_hi_schedule() are almost identical. Move the common code from both function into __tasklet_schedule_common() and let both functions invoke it with different arguments. [ bigeasy: Splitted out from RT's "tasklet: Prevent tasklets from going into infinite spin in RT" and added commit message. Use this_cpu_ptr(headp) in __tasklet_schedule_common() as suggested by Julia Cartwright ] Signed-off-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Julia Cartwright <juliac@eso.teric.us> Link: https://lkml.kernel.org/r/20180227164808.10093-2-bigeasy@linutronix.de
-rw-r--r--kernel/softirq.c28
1 files changed, 16 insertions, 12 deletions
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 24d243ef8e71..2394b009994f 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -460,29 +460,33 @@ struct tasklet_head {
static DEFINE_PER_CPU(struct tasklet_head, tasklet_vec);
static DEFINE_PER_CPU(struct tasklet_head, tasklet_hi_vec);
-void __tasklet_schedule(struct tasklet_struct *t)
+static void __tasklet_schedule_common(struct tasklet_struct *t,
+ struct tasklet_head __percpu *headp,
+ unsigned int softirq_nr)
{
+ struct tasklet_head *head;
unsigned long flags;
local_irq_save(flags);
+ head = this_cpu_ptr(headp);
t->next = NULL;
- *__this_cpu_read(tasklet_vec.tail) = t;
- __this_cpu_write(tasklet_vec.tail, &(t->next));
- raise_softirq_irqoff(TASKLET_SOFTIRQ);
+ *head->tail = t;
+ head->tail = &(t->next);
+ raise_softirq_irqoff(softirq_nr);
local_irq_restore(flags);
}
+
+void __tasklet_schedule(struct tasklet_struct *t)
+{
+ __tasklet_schedule_common(t, &tasklet_vec,
+ TASKLET_SOFTIRQ);
+}
EXPORT_SYMBOL(__tasklet_schedule);
void __tasklet_hi_schedule(struct tasklet_struct *t)
{
- unsigned long flags;
-
- local_irq_save(flags);
- t->next = NULL;
- *__this_cpu_read(tasklet_hi_vec.tail) = t;
- __this_cpu_write(tasklet_hi_vec.tail, &(t->next));
- raise_softirq_irqoff(HI_SOFTIRQ);
- local_irq_restore(flags);
+ __tasklet_schedule_common(t, &tasklet_hi_vec,
+ HI_SOFTIRQ);
}
EXPORT_SYMBOL(__tasklet_hi_schedule);