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Commit 8fa7845d authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

rcu: Remove "cpu" argument to rcu_cleanup_after_idle() 



The "cpu" argument to rcu_cleanup_after_idle() is always the current
CPU, so drop it.  This moves the smp_processor_id() from the caller to
rcu_cleanup_after_idle(), saving argument-passing overhead.  Again,
the anticipated cross-CPU uses of these functions has been replaced
by NO_HZ_FULL.

Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: default avatarPranith Kumar <bobby.prani@gmail.com>
parent 198bbf81

kernel/rcu/tree.c

+1 −1
Original line number Diff line number Diff line
@@ -661,7 +661,7 @@ static void rcu_eqs_exit_common(long long oldval, int user) 
	/* CPUs seeing atomic_inc() must see later RCU read-side crit sects */

	smp_mb__after_atomic();  /* See above. */

	WARN_ON_ONCE(!(atomic_read(&rdtp->dynticks) & 0x1));

	rcu_cleanup_after_idle(smp_processor_id());

	rcu_cleanup_after_idle();

	trace_rcu_dyntick(TPS("End"), oldval, rdtp->dynticks_nesting);

	if (!user && !is_idle_task(current)) {

		struct task_struct *idle __maybe_unused =

kernel/rcu/tree.h

+1 −1
Original line number Diff line number Diff line
@@ -579,7 +579,7 @@ static int rcu_spawn_one_boost_kthread(struct rcu_state *rsp, 
#endif /* #ifdef CONFIG_RCU_BOOST */

static void __init rcu_spawn_boost_kthreads(void);

static void rcu_prepare_kthreads(int cpu);

static void rcu_cleanup_after_idle(int cpu);

static void rcu_cleanup_after_idle(void);

static void rcu_prepare_for_idle(void);

static void rcu_idle_count_callbacks_posted(void);

static void print_cpu_stall_info_begin(void);

kernel/rcu/tree_plugin.h

+3 −3
Original line number Diff line number Diff line
@@ -1523,7 +1523,7 @@ int rcu_needs_cpu(unsigned long *delta_jiffies) 
 * Because we do not have RCU_FAST_NO_HZ, don't bother cleaning up

 * after it.

 */

static void rcu_cleanup_after_idle(int cpu)

static void rcu_cleanup_after_idle(void)

{

}
@@ -1731,10 +1731,10 @@ static void rcu_prepare_for_idle(void) 
 * any grace periods that elapsed while the CPU was idle, and if any

 * callbacks are now ready to invoke, initiate invocation.

 */

static void rcu_cleanup_after_idle(int cpu)

static void rcu_cleanup_after_idle(void)

{

#ifndef CONFIG_RCU_NOCB_CPU_ALL

	if (rcu_is_nocb_cpu(cpu))

	if (rcu_is_nocb_cpu(smp_processor_id()))

		return;

	if (rcu_try_advance_all_cbs())

		invoke_rcu_core();