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softirq: introduce tasklet_hrtimer infrastructure

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commit ca109491f (hrtimer: removing all ur callback modes) moved all
hrtimer callbacks into hard interrupt context when high resolution
timers are active. That breaks code which relied on the assumption
that the callback happens in softirq context.

Provide a generic infrastructure which combines tasklets and hrtimers
together to provide an in-softirq hrtimer experience.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: torvalds@linux-foundation.org
Cc: kaber@trash.net
Cc: David Miller <davem@davemloft.net>
LKML-Reference: <1248265724.27058.1366.camel@twins>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Peter Zijlstra
2009-07-22 14:18:35 +02:00
committed by Thomas Gleixner
parent aea1f7964a
commit 9ba5f005c9
2 changed files with 89 additions and 1 deletions
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26
include/linux/interrupt.h
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@@ -14,6 +14,7 @@
#include <linux/irqflags.h>
#include <linux/smp.h>
#include <linux/percpu.h>
#include <linux/hrtimer.h>
#include <asm/atomic.h>
#include <asm/ptrace.h>
@@ -517,6 +518,31 @@ extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
extern void tasklet_init(struct tasklet_struct *t,
void (*func)(unsigned long), unsigned long data);
struct tasklet_hrtimer {
struct hrtimer timer;
struct tasklet_struct tasklet;
enum hrtimer_restart (*function)(struct hrtimer *);
};
extern void
tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer,
enum hrtimer_restart (*function)(struct hrtimer *),
clockid_t which_clock, enum hrtimer_mode mode);
static inline
int tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time,
const enum hrtimer_mode mode)
{
return hrtimer_start(&ttimer->timer, time, mode);
}
static inline
void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer)
{
hrtimer_cancel(&ttimer->timer);
tasklet_kill(&ttimer->tasklet);
}
/*
* Autoprobing for irqs:
*