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Commit 99745b6a authored Nov 10, 2011 by Paul E. McKenney Committed by Paul E. McKenney Dec 11, 2011

rcu: Make RCU use the new is_idle_task() API



Change from direct comparison of ->pid with zero to is_idle_task().

Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

parent c4f30608

kernel/rcutiny.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -64,7 +64,7 @@ static void rcu_idle_enter_common(long long oldval)
		return;
		}
		RCU_TRACE(trace_rcu_dyntick("Start", oldval, rcu_dynticks_nesting));
		if (current->pid != 0) {
		if (!is_idle_task(current)) {
		struct task_struct *idle = idle_task(smp_processor_id());

		RCU_TRACE(trace_rcu_dyntick("Error on entry: not idle task",
		@@ -118,7 +118,7 @@ static void rcu_idle_exit_common(long long oldval)
		return;
		}
		RCU_TRACE(trace_rcu_dyntick("End", oldval, rcu_dynticks_nesting));
		if (current->pid != 0) {
		if (!is_idle_task(current)) {
		struct task_struct *idle = idle_task(smp_processor_id());

		RCU_TRACE(trace_rcu_dyntick("Error on exit: not idle task",

kernel/rcutree.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -355,7 +355,7 @@ static void rcu_idle_enter_common(struct rcu_dynticks *rdtp, long long oldval)
		return;
		}
		trace_rcu_dyntick("Start", oldval, rdtp->dynticks_nesting);
		if (current->pid != 0) {
		if (!is_idle_task(current)) {
		struct task_struct *idle = idle_task(smp_processor_id());

		trace_rcu_dyntick("Error on entry: not idle task",
		@@ -449,7 +449,7 @@ static void rcu_idle_exit_common(struct rcu_dynticks *rdtp, long long oldval)
		smp_mb__after_atomic_inc(); /* See above. */
		WARN_ON_ONCE(!(atomic_read(&rdtp->dynticks) & 0x1));
		trace_rcu_dyntick("End", oldval, rdtp->dynticks_nesting);
		if (current->pid != 0) {
		if (!is_idle_task(current)) {
		struct task_struct *idle = idle_task(smp_processor_id());

		trace_rcu_dyntick("Error on exit: not idle task",