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.
Paul, I'm disappointed, this was so trivial I didn't get a chance to
learn anything ;-)
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
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);
#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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