linux-kernel - [PATCH 12/13] nohz: Allow all CPUs outside nohz

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Message-Id: <1387320692-28460-13-git-send-email-fweisbec@gmail.com>
Date:	Tue, 17 Dec 2013 23:51:31 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	John Stultz <john.stultz@...aro.org>,
	Alex Shi <alex.shi@...aro.org>,
	Kevin Hilman <khilman@...aro.org>
Subject: [PATCH 12/13] nohz: Allow all CPUs outside nohz_full range to do timekeeping

Now that we have all the infrastructure in place and ready to support
timekeeping duty balanced across every non full dynticks CPUs, we can
hereby extend the timekeeping duty affinity.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: John Stultz <john.stultz@...aro.org>
Cc: Alex Shi <alex.shi@...aro.org>
Cc: Kevin Hilman <khilman@...aro.org>
---
 include/linux/tick.h | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/include/linux/tick.h b/include/linux/tick.h
index bd3c32e..07c02e8 100644
--- a/include/linux/tick.h
+++ b/include/linux/tick.h
@@ -203,15 +203,7 @@ static inline int tick_timekeeping_default_cpu(void)
  */
 static inline bool tick_timekeeping_cpu(int cpu)
 {
-	/*
-	 * If there are full dynticks CPUs around,
-	 * CPU 0 must stay periodic to update timekeeping.
-	 */
-	if (tick_nohz_full_enabled())
-		return cpu == 0;
-
-	/* Otherwise any CPU is elligible for timekeeping duty */
-	return true;
+	return !tick_nohz_full_cpu(cpu);
 }
 
 extern void tick_nohz_init(void);
-- 
1.8.3.1

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