diff options
Diffstat (limited to 'kernel/rcu/tiny.c')
| -rw-r--r-- | kernel/rcu/tiny.c | 28 |
1 files changed, 27 insertions, 1 deletions
diff --git a/kernel/rcu/tiny.c b/kernel/rcu/tiny.c index 477b4eb44af5..dd572ce7c747 100644 --- a/kernel/rcu/tiny.c +++ b/kernel/rcu/tiny.c @@ -22,6 +22,7 @@ #include <linux/time.h> #include <linux/cpu.h> #include <linux/prefetch.h> +#include <linux/slab.h> #include "rcu.h" @@ -73,6 +74,31 @@ void rcu_sched_clock_irq(int user) } } +/* + * Reclaim the specified callback, either by invoking it for non-kfree cases or + * freeing it directly (for kfree). Return true if kfreeing, false otherwise. + */ +static inline bool rcu_reclaim_tiny(struct rcu_head *head) +{ + rcu_callback_t f; + unsigned long offset = (unsigned long)head->func; + + rcu_lock_acquire(&rcu_callback_map); + if (__is_kfree_rcu_offset(offset)) { + trace_rcu_invoke_kfree_callback("", head, offset); + kfree((void *)head - offset); + rcu_lock_release(&rcu_callback_map); + return true; + } + + trace_rcu_invoke_callback("", head); + f = head->func; + WRITE_ONCE(head->func, (rcu_callback_t)0L); + f(head); + rcu_lock_release(&rcu_callback_map); + return false; +} + /* Invoke the RCU callbacks whose grace period has elapsed. */ static __latent_entropy void rcu_process_callbacks(struct softirq_action *unused) { @@ -100,7 +126,7 @@ static __latent_entropy void rcu_process_callbacks(struct softirq_action *unused prefetch(next); debug_rcu_head_unqueue(list); local_bh_disable(); - __rcu_reclaim("", list); + rcu_reclaim_tiny(list); local_bh_enable(); list = next; } |