/* * Read-Copy Update definitions shared among RCU implementations. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * * Copyright IBM Corporation, 2011 * * Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com> */ #ifndef __LINUX_RCU_H#define __LINUX_RCU_H #ifdef CONFIG_RCU_TRACE#define RCU_TRACE(stmt) stmt#else /* #ifdef CONFIG_RCU_TRACE */#define RCU_TRACE(stmt)#endif /* #else #ifdef CONFIG_RCU_TRACE */ /* * debug_rcu_head_queue()/debug_rcu_head_unqueue() are used internally * by call_rcu() and rcu callback execution, and are therefore not part of the * RCU API. Leaving in rcupdate.h because they are used by all RCU flavors. */ #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD# define STATE_RCU_HEAD_READY	0# define STATE_RCU_HEAD_QUEUED	1 extern struct debug_obj_descr rcuhead_debug_descr; static inline void debug_rcu_head_queue(struct rcu_head *head){	WARN_ON_ONCE((unsigned long)head & 0x3);	debug_object_activate(head, &rcuhead_debug_descr);	debug_object_active_state(head, &rcuhead_debug_descr,				  STATE_RCU_HEAD_READY,				  STATE_RCU_HEAD_QUEUED);} static inline void debug_rcu_head_unqueue(struct rcu_head *head){	debug_object_active_state(head, &rcuhead_debug_descr,				  STATE_RCU_HEAD_QUEUED,				  STATE_RCU_HEAD_READY);	debug_object_deactivate(head, &rcuhead_debug_descr);}#else	/* !CONFIG_DEBUG_OBJECTS_RCU_HEAD */static inline void debug_rcu_head_queue(struct rcu_head *head){} static inline void debug_rcu_head_unqueue(struct rcu_head *head){}#endif	/* #else !CONFIG_DEBUG_OBJECTS_RCU_HEAD */ extern void kfree(const void *); static inline void __rcu_reclaim(char *rn, struct rcu_head *head){	unsigned long offset = (unsigned long)head->func; 	if (__is_kfree_rcu_offset(offset)) {		RCU_TRACE(trace_rcu_invoke_kfree_callback(rn, head, offset));		kfree((void *)head - offset);	} else {		RCU_TRACE(trace_rcu_invoke_callback(rn, head));		head->func(head);	}} #endif /* __LINUX_RCU_H */