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softirq: Consolidate common code in __tasklet_[hi]_schedule()

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__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
This commit is contained in:
Ingo Molnar 2018-02-27 17:48:07 +01:00 committed by Thomas Gleixner
parent f09777fa89
commit 6498ddad30
1 changed files with 16 additions and 12 deletions
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28
kernel/softirq.c
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@ -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);