diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/rcutree.c | 6 | ||||
| -rw-r--r-- | kernel/rcutree.h | 1 | ||||
| -rw-r--r-- | kernel/rcutree_plugin.h | 13 | ||||
| -rw-r--r-- | kernel/time/tick-sched.c | 22 |
4 files changed, 23 insertions, 19 deletions
diff --git a/kernel/rcutree.c b/kernel/rcutree.c index f5ab50235cba..1d4ceff793a4 100644 --- a/kernel/rcutree.c +++ b/kernel/rcutree.c @@ -1695,7 +1695,7 @@ rcu_send_cbs_to_orphanage(int cpu, struct rcu_state *rsp, struct rcu_node *rnp, struct rcu_data *rdp) { /* No-CBs CPUs do not have orphanable callbacks. */ - if (is_nocb_cpu(rdp->cpu)) + if (rcu_is_nocb_cpu(rdp->cpu)) return; /* @@ -2757,10 +2757,10 @@ static void _rcu_barrier(struct rcu_state *rsp) * corresponding CPU's preceding callbacks have been invoked. */ for_each_possible_cpu(cpu) { - if (!cpu_online(cpu) && !is_nocb_cpu(cpu)) + if (!cpu_online(cpu) && !rcu_is_nocb_cpu(cpu)) continue; rdp = per_cpu_ptr(rsp->rda, cpu); - if (is_nocb_cpu(cpu)) { + if (rcu_is_nocb_cpu(cpu)) { _rcu_barrier_trace(rsp, "OnlineNoCB", cpu, rsp->n_barrier_done); atomic_inc(&rsp->barrier_cpu_count); diff --git a/kernel/rcutree.h b/kernel/rcutree.h index f993c0ac47db..38acc49da2c6 100644 --- a/kernel/rcutree.h +++ b/kernel/rcutree.h @@ -529,7 +529,6 @@ static void print_cpu_stall_info(struct rcu_state *rsp, int cpu); static void print_cpu_stall_info_end(void); static void zero_cpu_stall_ticks(struct rcu_data *rdp); static void increment_cpu_stall_ticks(void); -static bool is_nocb_cpu(int cpu); static bool __call_rcu_nocb(struct rcu_data *rdp, struct rcu_head *rhp, bool lazy); static bool rcu_nocb_adopt_orphan_cbs(struct rcu_state *rsp, diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h index a5745e9b5d5a..0cd91cc18db4 100644 --- a/kernel/rcutree_plugin.h +++ b/kernel/rcutree_plugin.h @@ -2167,7 +2167,7 @@ static int __init parse_rcu_nocb_poll(char *arg) early_param("rcu_nocb_poll", parse_rcu_nocb_poll); /* Is the specified CPU a no-CPUs CPU? */ -static bool is_nocb_cpu(int cpu) +bool rcu_is_nocb_cpu(int cpu) { if (have_rcu_nocb_mask) return cpumask_test_cpu(cpu, rcu_nocb_mask); @@ -2225,7 +2225,7 @@ static bool __call_rcu_nocb(struct rcu_data *rdp, struct rcu_head *rhp, bool lazy) { - if (!is_nocb_cpu(rdp->cpu)) + if (!rcu_is_nocb_cpu(rdp->cpu)) return 0; __call_rcu_nocb_enqueue(rdp, rhp, &rhp->next, 1, lazy); return 1; @@ -2242,7 +2242,7 @@ static bool __maybe_unused rcu_nocb_adopt_orphan_cbs(struct rcu_state *rsp, long qll = rsp->qlen_lazy; /* If this is not a no-CBs CPU, tell the caller to do it the old way. */ - if (!is_nocb_cpu(smp_processor_id())) + if (!rcu_is_nocb_cpu(smp_processor_id())) return 0; rsp->qlen = 0; rsp->qlen_lazy = 0; @@ -2282,7 +2282,7 @@ static bool nocb_cpu_expendable(int cpu) * If there are no no-CB CPUs or if this CPU is not a no-CB CPU, * then offlining this CPU is harmless. Let it happen. */ - if (!have_rcu_nocb_mask || is_nocb_cpu(cpu)) + if (!have_rcu_nocb_mask || rcu_is_nocb_cpu(cpu)) return 1; /* If no memory, play it safe and keep the CPU around. */ @@ -2464,11 +2464,6 @@ static void __init rcu_init_nocb(void) #else /* #ifdef CONFIG_RCU_NOCB_CPU */ -static bool is_nocb_cpu(int cpu) -{ - return false; -} - static bool __call_rcu_nocb(struct rcu_data *rdp, struct rcu_head *rhp, bool lazy) { diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index 2bac5ea2c9af..d71a5f2bd7b2 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -203,17 +203,27 @@ static int __cpuinit tick_nohz_cpu_down_callback(struct notifier_block *nfb, */ static char __initdata nohz_full_buf[NR_CPUS + 1]; -static int __init init_tick_nohz_full(void) +void __init tick_nohz_init(void) { - if (have_nohz_full_mask) - cpu_notifier(tick_nohz_cpu_down_callback, 0); + int cpu; + + if (!have_nohz_full_mask) + return; + + 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); - - return 0; } -core_initcall(init_tick_nohz_full); #else #define have_nohz_full_mask (0) #endif |