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>

diff --git a/kernel/rcutiny.c b/kernel/rcutiny.c
index 4e16ce3..e5bd949 100644 (file)
--- a/kernel/rcutiny.c
+++ b/kernel/rcutiny.c
@@ -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",

diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 49e0783..7fb8b0e 100644 (file)
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -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",