On Thu, Jun 07, 2007 at 02:26:59PM -0400, Steven Rostedt wrote:
> Following Dipankar's lead, I converted the tasklet in rcupreempt.c into
> a softirq.
>
> I've compiled and booted with this patch, but ran no other tests.
I should be able to run rcutorture on it.
> Paul, I'm disappointed, this was so trivial I didn't get a chance to
> learn anything ;-)
;-)
Some nits below.
Thanx, Paul
> Signed-off-by: Steven Rostedt <[email protected]>
>
> Index: linux-2.6.21-rt9/include/linux/rcupreempt.h
> ===================================================================
> --- linux-2.6.21-rt9.orig/include/linux/rcupreempt.h
> +++ linux-2.6.21-rt9/include/linux/rcupreempt.h
> @@ -63,7 +63,9 @@ extern void rcu_check_callbacks(int cpu,
> extern void rcu_restart_cpu(int cpu);
> extern long rcu_batches_completed(void);
>
> -extern void rcu_process_callbacks(unsigned long unused);
> +struct softirq_action;
> +
> +extern void rcu_process_callbacks(struct softirq_action *unused);
I don't understand why the above is needed -- interrupt.h is included,
and the use of rcu_process_callbacks() follows the definition.
> #endif /* __KERNEL__ */
> #endif /* __LINUX_RCUPREEMPT_H */
> Index: linux-2.6.21-rt9/kernel/rcupreempt.c
> ===================================================================
> --- linux-2.6.21-rt9.orig/kernel/rcupreempt.c
> +++ linux-2.6.21-rt9/kernel/rcupreempt.c
> @@ -57,7 +57,6 @@
> struct rcu_data {
> raw_spinlock_t lock;
> long completed; /* Number of last completed batch. */
> - struct tasklet_struct rcu_tasklet;
> struct rcu_head *nextlist;
> struct rcu_head **nexttail;
> struct rcu_head *waitlist;
> @@ -255,7 +254,7 @@ void rcu_check_callbacks(int cpu, int us
> spin_unlock_irqrestore(&rcu_data.lock, oldirq);
> } else {
> spin_unlock_irqrestore(&rcu_data.lock, oldirq);
> - tasklet_schedule(&rcu_data.rcu_tasklet);
> + raise_softirq(RCU_SOFTIRQ);
> }
> }
>
> @@ -279,7 +278,7 @@ void rcu_advance_callbacks(int cpu, int
> spin_unlock_irqrestore(&rcu_data.lock, oldirq);
> }
>
> -void rcu_process_callbacks(unsigned long unused)
> +void rcu_process_callbacks(struct softirq_action *unused)
> {
> unsigned long flags;
> struct rcu_head *next, *list;
> @@ -367,7 +366,7 @@ void __init __rcu_init(void)
> rcu_data.waittail = &rcu_data.waitlist;
> rcu_data.donelist = NULL;
> rcu_data.donetail = &rcu_data.donelist;
> - tasklet_init(&rcu_data.rcu_tasklet, rcu_process_callbacks, 0UL);
> + open_softirq(RCU_SOFTIRQ, rcu_process_callbacks, NULL);
> }
>
> /*
>
>
> -
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