projects / linux.git / blame
| 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 <[email protected]> | |
| 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 | ||
| d4c08f2a | 72 | static inline void __rcu_reclaim(char *rn, struct rcu_head *head) |
| 29c00b4a PM |
73 | { |
| 74 | unsigned long offset = (unsigned long)head->func; | |
| 75 | ||
| 76 | if (__is_kfree_rcu_offset(offset)) { | |
| d4c08f2a | 77 | RCU_TRACE(trace_rcu_invoke_kfree_callback(rn, head, offset)); |
| 29c00b4a PM |
78 | kfree((void *)head - offset); |
| 79 | } else { | |
| d4c08f2a | 80 | RCU_TRACE(trace_rcu_invoke_callback(rn, head)); |
| 29c00b4a PM |
81 | head->func(head); |
| 82 | } | |
| 83 | } | |
| 84 | ||
| 85 | #endif /* __LINUX_RCU_H */ |