Convert kernel/rcupdate's rcu_barrier_sema to mutex.
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| @@ -47,6 +47,7 @@ · 46 unmodified lines | ||
| 47 | 47 | #include <linux/notifier.h> |
| 48 | 48 | #include <linux/rcupdate.h> |
| 49 | 49 | #include <linux/cpu.h> |
| 50 | +#include <linux/mutex.h> | |
| 50 | 51 | |
| 51 | 52 | /* Definition for rcupdate control block. */ |
| 52 | 53 | struct rcu_ctrlblk rcu_ctrlblk = { |
| @@ -75,7 +76,7 @@ static int rsinterval = 1000; · 22 unmodified lines | ||
| 75 | 76 | #endif |
| 76 | 77 | |
| 77 | 78 | static atomic_t rcu_barrier_cpu_count; |
| 78 | −static struct semaphore rcu_barrier_sema; | |
| 79 | +static DEFINE_MUTEX(rcu_barrier_mutex); | |
| 79 | 80 | static struct completion rcu_barrier_completion; |
| 80 | 81 | |
| 81 | 82 | #ifdef CONFIG_SMP |
| @@ -207,13 +208,13 @@ static void rcu_barrier_func(void *notused) · 125 unmodified lines | ||
| 207 | 208 | void rcu_barrier(void) |
| 208 | 209 | { |
| 209 | 210 | BUG_ON(in_interrupt()); |
| 210 | − /* Take cpucontrol semaphore to protect against CPU hotplug */ | |
| 211 | − down(&rcu_barrier_sema); | |
| 211 | + /* Take cpucontrol mutex to protect against CPU hotplug */ | |
| 212 | + mutex_lock(&rcu_barrier_mutex); | |
| 212 | 213 | init_completion(&rcu_barrier_completion); |
| 213 | 214 | atomic_set(&rcu_barrier_cpu_count, 0); |
| 214 | 215 | on_each_cpu(rcu_barrier_func, NULL, 0, 1); |
| 215 | 216 | wait_for_completion(&rcu_barrier_completion); |
| 216 | − up(&rcu_barrier_sema); | |
| 217 | + mutex_unlock(&rcu_barrier_mutex); | |
| 217 | 218 | } |
| 218 | 219 | EXPORT_SYMBOL_GPL(rcu_barrier); |
| 219 | 220 | |
| @@ -549,7 +550,6 @@ static struct notifier_block __devinitdata rcu_nb = { · 329 unmodified lines | ||
| 549 | 550 | */ |
| 550 | 551 | void __init rcu_init(void) |
| 551 | 552 | { |
| 552 | − sema_init(&rcu_barrier_sema, 1); | |
| 553 | 553 | rcu_cpu_notify(&rcu_nb, CPU_UP_PREPARE, |
| 554 | 554 | (void *)(long)smp_processor_id()); |
| 555 | 555 | /* Register notifier for non-boot CPUs */ |