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authorIngo Molnar <mingo@kernel.org>2013-07-10 10:43:25 +0200
committerIngo Molnar <mingo@kernel.org>2013-07-10 10:43:25 +0200
commite399eb56a6110e13f97e644658648602e2b08de7 (patch)
treeedcd90e3134a5409339794f43d5dd4453cd72586 /kernel/time
parent7c6809ff2bd63d4c97ce9e0b94d39d5180842c48 (diff)
parent5b8621a68fdcd2baf1d3b413726f913a5254d46a (diff)
Merge branch 'timers/core' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks into timers/urgent
Pull nohz updates/fixes from Frederic Weisbecker: ' Note that "watchdog: Boot-disable by default on full dynticks" is a temporary solution to solve the issue with the watchdog that prevents the tick from stopping. This is to make sure that 3.11 doesn't have that problem as several people complained about it. A proper and longer term solution has been proposed by Peterz: http://lkml.kernel.org/r/20130618103632.GO3204@twins.programming.kicks-ass.net ' Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/time')
-rw-r--r--kernel/time/tick-sched.c15
1 files changed, 5 insertions, 10 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 0cf1c1453181..69601726a745 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -178,6 +178,11 @@ static bool can_stop_full_tick(void)
*/
if (!sched_clock_stable) {
trace_tick_stop(0, "unstable sched clock\n");
+ /*
+ * Don't allow the user to think they can get
+ * full NO_HZ with this machine.
+ */
+ WARN_ONCE(1, "NO_HZ FULL will not work with unstable sched clock");
return false;
}
#endif
@@ -346,16 +351,6 @@ void __init tick_nohz_init(void)
}
cpu_notifier(tick_nohz_cpu_down_callback, 0);
-
- /* Make sure full dynticks CPU are also RCU nocbs */
- for_each_cpu(cpu, nohz_full_mask) {
- if (!rcu_is_nocb_cpu(cpu)) {
- pr_warning("NO_HZ: CPU %d is not RCU nocb: "
- "cleared from nohz_full range", cpu);
- cpumask_clear_cpu(cpu, nohz_full_mask);
- }
- }
-
cpulist_scnprintf(nohz_full_buf, sizeof(nohz_full_buf), nohz_full_mask);
pr_info("NO_HZ: Full dynticks CPUs: %s.\n", nohz_full_buf);
}