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);
 }