diff options
Diffstat (limited to 'kernel/rcupdate.c')
| -rw-r--r-- | kernel/rcupdate.c | 25 |
1 files changed, 12 insertions, 13 deletions
diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c index 8cf15a569fcd..13458bbaa1be 100644 --- a/kernel/rcupdate.c +++ b/kernel/rcupdate.c @@ -47,15 +47,16 @@ #include <linux/notifier.h> #include <linux/rcupdate.h> #include <linux/cpu.h> +#include <linux/mutex.h> /* Definition for rcupdate control block. */ -struct rcu_ctrlblk rcu_ctrlblk = { +static struct rcu_ctrlblk rcu_ctrlblk = { .cur = -300, .completed = -300, .lock = SPIN_LOCK_UNLOCKED, .cpumask = CPU_MASK_NONE, }; -struct rcu_ctrlblk rcu_bh_ctrlblk = { +static struct rcu_ctrlblk rcu_bh_ctrlblk = { .cur = -300, .completed = -300, .lock = SPIN_LOCK_UNLOCKED, @@ -75,7 +76,7 @@ static int rsinterval = 1000; #endif static atomic_t rcu_barrier_cpu_count; -static struct semaphore rcu_barrier_sema; +static DEFINE_MUTEX(rcu_barrier_mutex); static struct completion rcu_barrier_completion; #ifdef CONFIG_SMP @@ -207,13 +208,13 @@ static void rcu_barrier_func(void *notused) void rcu_barrier(void) { BUG_ON(in_interrupt()); - /* Take cpucontrol semaphore to protect against CPU hotplug */ - down(&rcu_barrier_sema); + /* Take cpucontrol mutex to protect against CPU hotplug */ + mutex_lock(&rcu_barrier_mutex); init_completion(&rcu_barrier_completion); atomic_set(&rcu_barrier_cpu_count, 0); on_each_cpu(rcu_barrier_func, NULL, 0, 1); wait_for_completion(&rcu_barrier_completion); - up(&rcu_barrier_sema); + mutex_unlock(&rcu_barrier_mutex); } EXPORT_SYMBOL_GPL(rcu_barrier); @@ -415,8 +416,8 @@ static void __rcu_process_callbacks(struct rcu_ctrlblk *rcp, rdp->curtail = &rdp->curlist; } - local_irq_disable(); if (rdp->nxtlist && !rdp->curlist) { + local_irq_disable(); rdp->curlist = rdp->nxtlist; rdp->curtail = rdp->nxttail; rdp->nxtlist = NULL; @@ -441,9 +442,8 @@ static void __rcu_process_callbacks(struct rcu_ctrlblk *rcp, rcu_start_batch(rcp); spin_unlock(&rcp->lock); } - } else { - local_irq_enable(); } + rcu_check_quiescent_state(rcp, rdp); if (rdp->donelist) rcu_do_batch(rdp); @@ -549,7 +549,6 @@ static struct notifier_block __devinitdata rcu_nb = { */ void __init rcu_init(void) { - sema_init(&rcu_barrier_sema, 1); rcu_cpu_notify(&rcu_nb, CPU_UP_PREPARE, (void *)(long)smp_processor_id()); /* Register notifier for non-boot CPUs */ @@ -609,7 +608,7 @@ module_param(qlowmark, int, 0); module_param(rsinterval, int, 0); #endif EXPORT_SYMBOL_GPL(rcu_batches_completed); -EXPORT_SYMBOL(call_rcu); /* WARNING: GPL-only in April 2006. */ -EXPORT_SYMBOL(call_rcu_bh); /* WARNING: GPL-only in April 2006. */ +EXPORT_SYMBOL_GPL_FUTURE(call_rcu); /* WARNING: GPL-only in April 2006. */ +EXPORT_SYMBOL_GPL_FUTURE(call_rcu_bh); /* WARNING: GPL-only in April 2006. */ EXPORT_SYMBOL_GPL(synchronize_rcu); -EXPORT_SYMBOL(synchronize_kernel); /* WARNING: GPL-only in April 2006. */ +EXPORT_SYMBOL_GPL_FUTURE(synchronize_kernel); /* WARNING: GPL-only in April 2006. */ |