[GitHub/mt8127/android_kernel_alcatel_ttab.git] / kernel / rcu.h

/*
 * 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(struct rcu_head *head)
{
	unsigned long offset = (unsigned long)head->func;

	if (__is_kfree_rcu_offset(offset)) {
		RCU_TRACE(trace_rcu_invoke_kfree_callback(head, offset));
		kfree((void *)head - offset);
	} else {
		RCU_TRACE(trace_rcu_invoke_callback(head));
		head->func(head);
	}
}

#endif /* __LINUX_RCU_H */
Commit	Line	Data
29c00b4a PM	1	/*
	2	* Read-Copy Update definitions shared among RCU implementations.
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation; either version 2 of the License, or
	7	* (at your option) any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software
	16	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	17	*
	18	* Copyright IBM Corporation, 2011
	19	*
	20	* Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
	21	*/
	22
	23	#ifndef __LINUX_RCU_H
	24	#define __LINUX_RCU_H
	25
e99033c5 PM	26	#ifdef CONFIG_RCU_TRACE
	27	#define RCU_TRACE(stmt) stmt
	28	#else /* #ifdef CONFIG_RCU_TRACE */
	29	#define RCU_TRACE(stmt)
	30	#endif /* #else #ifdef CONFIG_RCU_TRACE */
	31
29c00b4a PM	32	/*
	33	* debug_rcu_head_queue()/debug_rcu_head_unqueue() are used internally
	34	* by call_rcu() and rcu callback execution, and are therefore not part of the
	35	* RCU API. Leaving in rcupdate.h because they are used by all RCU flavors.
	36	*/
	37
	38	#ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD
	39	# define STATE_RCU_HEAD_READY 0
	40	# define STATE_RCU_HEAD_QUEUED 1
	41
	42	extern struct debug_obj_descr rcuhead_debug_descr;
	43
	44	static inline void debug_rcu_head_queue(struct rcu_head *head)
	45	{
	46	WARN_ON_ONCE((unsigned long)head & 0x3);
	47	debug_object_activate(head, &rcuhead_debug_descr);
	48	debug_object_active_state(head, &rcuhead_debug_descr,
	49	STATE_RCU_HEAD_READY,
	50	STATE_RCU_HEAD_QUEUED);
	51	}
	52
	53	static inline void debug_rcu_head_unqueue(struct rcu_head *head)
	54	{
	55	debug_object_active_state(head, &rcuhead_debug_descr,
	56	STATE_RCU_HEAD_QUEUED,
	57	STATE_RCU_HEAD_READY);
	58	debug_object_deactivate(head, &rcuhead_debug_descr);
	59	}
	60	#else /* !CONFIG_DEBUG_OBJECTS_RCU_HEAD */
	61	static inline void debug_rcu_head_queue(struct rcu_head *head)
	62	{
	63	}
	64
	65	static inline void debug_rcu_head_unqueue(struct rcu_head *head)
	66	{
	67	}
	68	#endif /* #else !CONFIG_DEBUG_OBJECTS_RCU_HEAD */
	69
	70	extern void kfree(const void *);
	71
	72	static inline void __rcu_reclaim(struct rcu_head *head)
	73	{
	74	unsigned long offset = (unsigned long)head->func;
	75
	76	if (__is_kfree_rcu_offset(offset)) {
e99033c5	77	RCU_TRACE(trace_rcu_invoke_kfree_callback(head, offset));
29c00b4a PM	78	kfree((void *)head - offset);
29c00b4a PM	79	} else {
e99033c5	80	RCU_TRACE(trace_rcu_invoke_callback(head));
29c00b4a PM	81	head->func(head);
	82	}
	83	}
	84
	85	#endif /* __LINUX_RCU_H */