From 93786a5f6aeb9c032c1c240246c5aabcf457b38f Mon Sep 17 00:00:00 2001 From: Frederic Weisbecker Date: Tue, 23 Jul 2013 02:31:06 +0200 Subject: [PATCH] watchdog: Make it work under full dynticks A perf event can be used without forcing the tick to stay alive if it doesn't use a frequency but a sample period and if it doesn't throttle (raise storm of events). Since the lockup detector neither use a perf event frequency nor should ever throttle due to its high period, it can now run concurrently with the full dynticks feature. So remove the hack that disabled the watchdog. Signed-off-by: Frederic Weisbecker Cc: Jiri Olsa Cc: Namhyung Kim Cc: Arnaldo Carvalho de Melo Cc: Stephane Eranian Cc: Don Zickus Cc: Srivatsa S. Bhat Cc: Anish Singh Signed-off-by: Peter Zijlstra Link: http://lkml.kernel.org/r/1374539466-4799-9-git-send-email-fweisbec@gmail.com Signed-off-by: Ingo Molnar --- kernel/watchdog.c | 8 -------- 1 file changed, 8 deletions(-) diff --git a/kernel/watchdog.c b/kernel/watchdog.c index 1241d8c91d5e..51c4f34d258e 100644 --- a/kernel/watchdog.c +++ b/kernel/watchdog.c @@ -553,14 +553,6 @@ void __init lockup_detector_init(void) { set_sample_period(); -#ifdef CONFIG_NO_HZ_FULL - if (watchdog_user_enabled) { - watchdog_user_enabled = 0; - pr_warning("Disabled lockup detectors by default for full dynticks\n"); - pr_warning("You can reactivate it with 'sysctl -w kernel.watchdog=1'\n"); - } -#endif - if (watchdog_user_enabled) watchdog_enable_all_cpus(); } -- 2.30.2