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rcu: Remove "cpu" argument to rcu_check_callbacks()

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The "cpu" argument was kept around on the off-chance that RCU might
offload scheduler-clock interrupts.  However, this offload approach
has been replaced by NO_HZ_FULL, which offloads -all- RCU processing
from qualifying CPUs.  It is therefore time to remove the "cpu" argument
to rcu_check_callbacks(), which this commit does.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Pranith Kumar <bobby.prani@gmail.com>
This commit is contained in:
Paul E. McKenney 2014-10-21 07:53:02 -07:00
parent 11bbb235c2
commit c3377c2da6
4 changed files with 6 additions and 7 deletions
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2
include/linux/rcupdate.h
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@ -260,7 +260,7 @@ static inline int rcu_preempt_depth(void)
void rcu_init(void); void rcu_init(void);
void rcu_sched_qs(void); void rcu_sched_qs(void);
void rcu_bh_qs(void); void rcu_bh_qs(void);
void rcu_check_callbacks(int cpu, int user); void rcu_check_callbacks(int user);
struct notifier_block; struct notifier_block;
void rcu_idle_enter(void); void rcu_idle_enter(void);
void rcu_idle_exit(void); void rcu_idle_exit(void);

2
kernel/rcu/tiny.c
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@ -247,7 +247,7 @@ void rcu_bh_qs(void)
* be called from hardirq context. It is normally called from the * be called from hardirq context. It is normally called from the
* scheduling-clock interrupt. * scheduling-clock interrupt.
*/ */
void rcu_check_callbacks(int cpu, int user) void rcu_check_callbacks(int user)
{ {
RCU_TRACE(check_cpu_stalls()); RCU_TRACE(check_cpu_stalls());
if (user || rcu_is_cpu_rrupt_from_idle()) if (user || rcu_is_cpu_rrupt_from_idle())

6
kernel/rcu/tree.c
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@ -2388,7 +2388,7 @@ static void rcu_do_batch(struct rcu_state *rsp, struct rcu_data *rdp)
* invoked from the scheduling-clock interrupt. If rcu_pending returns * invoked from the scheduling-clock interrupt. If rcu_pending returns
* false, there is no point in invoking rcu_check_callbacks(). * false, there is no point in invoking rcu_check_callbacks().
*/ */
void rcu_check_callbacks(int cpu, int user) void rcu_check_callbacks(int user)
{ {
trace_rcu_utilization(TPS("Start scheduler-tick")); trace_rcu_utilization(TPS("Start scheduler-tick"));
increment_cpu_stall_ticks(); increment_cpu_stall_ticks();
@ -2420,8 +2420,8 @@ void rcu_check_callbacks(int cpu, int user)
rcu_bh_qs(); rcu_bh_qs();
} }
rcu_preempt_check_callbacks(cpu); rcu_preempt_check_callbacks(smp_processor_id());
if (rcu_pending(cpu)) if (rcu_pending(smp_processor_id()))
invoke_rcu_core(); invoke_rcu_core();
if (user) if (user)
rcu_note_voluntary_context_switch(current); rcu_note_voluntary_context_switch(current);

3
kernel/time/timer.c
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@ -1377,12 +1377,11 @@ unsigned long get_next_timer_interrupt(unsigned long now)
void update_process_times(int user_tick) void update_process_times(int user_tick)
{ {
struct task_struct *p = current; struct task_struct *p = current;
int cpu = smp_processor_id();
/* Note: this timer irq context must be accounted for as well. */ /* Note: this timer irq context must be accounted for as well. */
account_process_tick(p, user_tick); account_process_tick(p, user_tick);
run_local_timers(); run_local_timers();
rcu_check_callbacks(cpu, user_tick); rcu_check_callbacks(user_tick);
#ifdef CONFIG_IRQ_WORK #ifdef CONFIG_IRQ_WORK
if (in_irq()) if (in_irq())
irq_work_tick(); irq_work_tick();