nohz: Remove tick_nohz_idle_enter_norcu() / tick_nohz_idle_exit_norcu()

Those two APIs were provided to optimize the calls of
tick_nohz_idle_enter() and rcu_idle_enter() into a single
irq disabled section. This way no interrupt happening in-between would
needlessly process any RCU job.

Now we are talking about an optimization for which benefits
have yet to be measured. Let's start simple and completely decouple
idle rcu and dyntick idle logics to simplify.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

1 files changed, 8 insertions, 4 deletions

diff --git a/arch/powerpc/platforms/iseries/setup.c b/arch/powerpc/platforms/iseries/setup.c
index d69d3d185e89..8fc62586a973 100644
--- a/arch/powerpc/platforms/iseries/setup.c
+++ b/arch/powerpc/platforms/iseries/setup.c
@@ -563,7 +563,8 @@ static void yield_shared_processor(void)
 static void iseries_shared_idle(void)
 {
         while (1) {
-                tick_nohz_idle_enter_norcu();
+                tick_nohz_idle_enter();
+                rcu_idle_enter();
                 while (!need_resched() && !hvlpevent_is_pending()) {
                         local_irq_disable();
                         ppc64_runlatch_off();
@@ -577,7 +578,8 @@ static void iseries_shared_idle(void)
                 }
 
                 ppc64_runlatch_on();
-                tick_nohz_idle_exit_norcu();
+                rcu_idle_exit();
+                tick_nohz_idle_exit();
 
                 if (hvlpevent_is_pending())
                         process_iSeries_events();
@@ -593,7 +595,8 @@ static void iseries_dedicated_idle(void)
         set_thread_flag(TIF_POLLING_NRFLAG);
 
         while (1) {
-                tick_nohz_idle_enter_norcu();
+                tick_nohz_idle_enter();
+                rcu_idle_enter();
                 if (!need_resched()) {
                         while (!need_resched()) {
                                 ppc64_runlatch_off();
@@ -610,7 +613,8 @@ static void iseries_dedicated_idle(void)
                 }
 
                 ppc64_runlatch_on();
-                tick_nohz_idle_exit_norcu();
+                rcu_idle_exit();
+                tick_nohz_idle_exit();
                 preempt_enable_no_resched();
                 schedule();
                 preempt_disable();