linux-kernel - [tip:sched/core] sched/isolation, watchdog: Use housekeeping

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Date:   Fri, 27 Oct 2017 05:02:12 -0700
From:   tip-bot for Frederic Weisbecker <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, paulmck@...ux.vnet.ibm.com, kernellwp@...il.com,
        cl@...ux.com, linux-kernel@...r.kernel.org, efault@....de,
        torvalds@...ux-foundation.org, riel@...hat.com,
        lcapitulino@...hat.com, mingo@...nel.org, cmetcalf@...lanox.com,
        peterz@...radead.org, tglx@...utronix.de, frederic@...nel.org
Subject: [tip:sched/core] sched/isolation, watchdog: Use
 housekeeping_cpumask() instead of ad-hoc version

Commit-ID:  13316b31fdaaa45f06793eb7992588359ba6ab9f
Gitweb:     https://git.kernel.org/tip/13316b31fdaaa45f06793eb7992588359ba6ab9f
Author:     Frederic Weisbecker <frederic@...nel.org>
AuthorDate: Fri, 27 Oct 2017 04:42:29 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 27 Oct 2017 09:55:25 +0200

sched/isolation, watchdog: Use housekeeping_cpumask() instead of ad-hoc version

While trying to disable the watchog on nohz_full CPUs, the watchdog
implements an ad-hoc version of housekeeping_cpumask(). Lets replace
those re-invented lines.

Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
Acked-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Chris Metcalf <cmetcalf@...lanox.com>
Cc: Christoph Lameter <cl@...ux.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Luiz Capitulino <lcapitulino@...hat.com>
Cc: Mike Galbraith <efault@....de>
Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Rik van Riel <riel@...hat.com>
Cc: Wanpeng Li <kernellwp@...il.com>
Link: http://lkml.kernel.org/r/1509072159-31808-3-git-send-email-frederic@kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/watchdog.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 3c44dba..562652c 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -774,15 +774,10 @@ int proc_watchdog_cpumask(struct ctl_table *table, int write,
 
 void __init lockup_detector_init(void)
 {
-#ifdef CONFIG_NO_HZ_FULL
-	if (tick_nohz_full_enabled()) {
+	if (tick_nohz_full_enabled())
 		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
-	cpumask_copy(&watchdog_cpumask, cpu_possible_mask);
-#endif
+
+	cpumask_copy(&watchdog_cpumask, housekeeping_cpumask());
 
 	if (!watchdog_nmi_probe())
 		nmi_watchdog_available = true;