[tip:sched/core] watchdog: Use housekeeping_cpumask() instead of ad-hoc version

[tip-bot for Frederic Weisbecker <tipbot@zytor.com>]

Commit-ID:  50e8101e1924460ad9349ba13782d64ce034a64f
Gitweb:     https://git.kernel.org/tip/50e8101e1924460ad9349ba13782d64ce034a64f
Author:     Frederic Weisbecker <frederic@kernel.org>
AuthorDate: Tue, 24 Oct 2017 15:06:51 +0200
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 24 Oct 2017 15:20:13 +0200

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@kernel.org>
Cc: Chris Metcalf <cmetcalf@mellanox.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Luiz Capitulino <lcapitulino@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wanpeng Li <kernellwp@gmail.com>
Link: http://lkml.kernel.org/r/1508850421-10058-3-git-send-email-frederic@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 kernel/watchdog.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index d71eee0..3ddce04 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;