linux-kernel - [PATCH 4/8] nohz: Remove idle task special case

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Date:	Thu, 11 Jun 2015 19:36:04 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux.com>,
	Ingo Molnar <mingo@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Rik van Riel <riel@...hat.com>
Subject: [PATCH 4/8] nohz: Remove idle task special case

This is a leftover from old days to avoid conflicts with dynticks idle
code. Now full dynticks and idle dynticks are better integrated and
interact without known issue.

So lets remove it.

Cc: Christoph Lameter <cl@...ux.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc; John Stultz <john.stultz@...aro.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Preeti U Murthy <preeti@...ux.vnet.ibm.com>
Cc: Rik van Riel <riel@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Viresh Kumar <viresh.kumar@...aro.org>
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
---
 kernel/time/tick-sched.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 812f7a3..324482f 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -208,10 +208,8 @@ void __tick_nohz_full_check(void)
 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);
 
 	if (tick_nohz_full_cpu(smp_processor_id())) {
-		if (ts->tick_stopped && !is_idle_task(current)) {
-			if (!can_stop_full_tick())
-				tick_nohz_restart_sched_tick(ts, ktime_get());
-		}
+		if (ts->tick_stopped && !can_stop_full_tick())
+			tick_nohz_restart_sched_tick(ts, ktime_get());
 	}
 }
 
@@ -710,7 +708,7 @@ static void tick_nohz_full_stop_tick(struct tick_sched *ts)
 #ifdef CONFIG_NO_HZ_FULL
 	int cpu = smp_processor_id();
 
-	if (!tick_nohz_full_cpu(cpu) || is_idle_task(current))
+	if (!tick_nohz_full_cpu(cpu))
 		return;
 
 	if (!ts->tick_stopped && ts->nohz_mode == NOHZ_MODE_INACTIVE)
-- 
2.1.4

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