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watchdog: simplify housekeeping affinity with the appropriate mask

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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.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Reviewed-by: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ulrich Obergfell <uobergfe@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Frederic Weisbecker 2015-09-04 15:45:09 -07:00 committed by Linus Torvalds
parent 230ec93909
commit 314b08ff52
1 changed files with 2 additions and 4 deletions
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6
kernel/watchdog.c
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@ -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