diff options
Diffstat (limited to 'kernel/rcutree.c')
| -rw-r--r-- | kernel/rcutree.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/kernel/rcutree.c b/kernel/rcutree.c index ba06207b1dd3..3585b42eb7cb 100644 --- a/kernel/rcutree.c +++ b/kernel/rcutree.c @@ -50,6 +50,7 @@ #include <linux/wait.h> #include <linux/kthread.h> #include <linux/prefetch.h> +#include <linux/tick.h> #include "rcutree.h" @@ -1480,6 +1481,7 @@ static void rcu_process_callbacks(struct softirq_action *unused) /* If we are last CPU on way to dyntick-idle mode, accelerate it. */ rcu_needs_cpu_flush(); } +static atomic_t rcu_barrier_cpu_count; /* * Wake up the current CPU's kthread. This replaces raise_softirq() @@ -1536,6 +1538,14 @@ __call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu), return; } + /* Work around for reboot issue, check rcu_barrier_cpu_count + to see whether it is in the _rcu_barrier process, do + tick_nohz_restart_sched_tick if yes. If we enqueue an rcu + callback, we need the CPU tick to stay alive until we take care + of those by completing the appropriate grace period. */ + if (atomic_read(&rcu_barrier_cpu_count) != 0) + tick_nohz_restart_sched_tick(); + /* * Force the grace period if too many callbacks or too long waiting. * Enforce hysteresis, and don't invoke force_quiescent_state() @@ -1750,7 +1760,6 @@ static int rcu_needs_cpu_quick_check(int cpu) } static DEFINE_PER_CPU(struct rcu_head, rcu_barrier_head) = {NULL}; -static atomic_t rcu_barrier_cpu_count; static DEFINE_MUTEX(rcu_barrier_mutex); static struct completion rcu_barrier_completion; |