diff options
| -rw-r--r-- | kernel/rcutree_plugin.h | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h index 45790bfb6e8..c4daf1e19e0 100644 --- a/kernel/rcutree_plugin.h +++ b/kernel/rcutree_plugin.h @@ -2027,6 +2027,9 @@ int rcu_needs_cpu(int cpu) static void rcu_prepare_for_idle(int cpu) { int c = 0; + unsigned long flags; + + local_irq_save(flags); /* * If there are no callbacks on this CPU or if RCU has no further @@ -2036,14 +2039,17 @@ static void rcu_prepare_for_idle(int cpu) if (!rcu_cpu_has_callbacks(cpu)) { per_cpu(rcu_dyntick_holdoff, cpu) = jiffies - 1; per_cpu(rcu_dyntick_drain, cpu) = 0; + per_cpu(rcu_awake_at_gp_end, cpu) = 0; + local_irq_restore(flags); trace_rcu_prep_idle("No callbacks"); return; } if (!rcu_pending(cpu)) { - trace_rcu_prep_idle("Dyntick with callbacks"); per_cpu(rcu_dyntick_holdoff, cpu) = jiffies - 1; per_cpu(rcu_dyntick_drain, cpu) = 0; per_cpu(rcu_awake_at_gp_end, cpu) = 1; + local_irq_restore(flags); + trace_rcu_prep_idle("Dyntick with callbacks"); return; /* Nothing to do immediately. */ } @@ -2052,6 +2058,7 @@ static void rcu_prepare_for_idle(int cpu) * refrained from disabling the scheduling-clock tick. */ if (per_cpu(rcu_dyntick_holdoff, cpu) == jiffies) { + local_irq_restore(flags); trace_rcu_prep_idle("In holdoff"); return; } @@ -2060,9 +2067,11 @@ static void rcu_prepare_for_idle(int cpu) if (per_cpu(rcu_dyntick_drain, cpu) <= 0) { /* First time through, initialize the counter. */ per_cpu(rcu_dyntick_drain, cpu) = RCU_NEEDS_CPU_FLUSHES; + per_cpu(rcu_awake_at_gp_end, cpu) = 0; } else if (--per_cpu(rcu_dyntick_drain, cpu) <= 0) { /* We have hit the limit, so time to give up. */ per_cpu(rcu_dyntick_holdoff, cpu) = jiffies; + local_irq_restore(flags); trace_rcu_prep_idle("Begin holdoff"); invoke_rcu_core(); /* Force the CPU out of dyntick-idle. */ return; @@ -2095,10 +2104,13 @@ static void rcu_prepare_for_idle(int cpu) * So try forcing the callbacks through the grace period. */ if (c) { + local_irq_restore(flags); trace_rcu_prep_idle("More callbacks"); invoke_rcu_core(); - } else + } else { + local_irq_restore(flags); trace_rcu_prep_idle("Callbacks drained"); + } } /* |