linux-kernel - [PATCH 4/4] watchdog: Simplify housekeeping affinity with the appropriate mask

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Message-Id: <1436454992-21462-5-git-send-email-fweisbec@gmail.com>
Date:	Thu,  9 Jul 2015 17:16:32 +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>,
	Chris Metcalf <cmetcalf@...hip.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Don Zickus <dzickus@...hat.com>,
	Ulrich Obergfell <uobergfe@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 4/4] watchdog: Simplify housekeeping affinity with the appropriate mask

housekeeping_mask gathers all the CPUs that aren't part of the nohz_full
set. This is exactly what we want the watchdog to be affine to without
the need to use complicated cpumask operations.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Chris Metcalf <cmetcalf@...hip.com>
Cc: Don Zickus <dzickus@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ulrich Obergfell <uobergfe@...hat.com>
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
---
 kernel/watchdog.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index e5bb86f..d18330f 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -929,10 +929,8 @@ void __init lockup_detector_init(void)
 
 #ifdef CONFIG_NO_HZ_FULL
 	if (tick_nohz_full_enabled()) {
-		if (!cpumask_empty(tick_nohz_full_mask))
-			pr_info("Disabling watchdog on nohz_full cores by default\n");
-		cpumask_andnot(&watchdog_cpumask, cpu_possible_mask,
-			       tick_nohz_full_mask);
+		pr_info("Disabling watchdog on nohz_full cores by default\n");
+		cpumask_copy(&watchdog_cpumask, housekeeping_mask);
 	} else
 		cpumask_copy(&watchdog_cpumask, cpu_possible_mask);
 #else
-- 
2.1.4

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