1 /*- 2 * Copyright (c) 2015 François Tigeot 3 * Copyright (c) 2016-2020 Mellanox Technologies, Ltd. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice unmodified, this list of conditions, and the following 11 * disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * 27 * $FreeBSD$ 28 */ 29 30 #ifndef _LINUX_RCULIST_H_ 31 #define _LINUX_RCULIST_H_ 32 33 #include <linux/list.h> 34 #include <linux/rcupdate.h> 35 36 #define list_entry_rcu(ptr, type, member) \ 37 container_of(READ_ONCE(ptr), type, member) 38 39 #define list_next_rcu(head) (*((struct list_head **)(&(head)->next))) 40 #define list_prev_rcu(head) (*((struct list_head **)(&(head)->prev))) 41 42 #define list_for_each_entry_rcu(pos, head, member) \ 43 for (pos = list_entry_rcu((head)->next, typeof(*(pos)), member); \ 44 &(pos)->member != (head); \ 45 pos = list_entry_rcu((pos)->member.next, typeof(*(pos)), member)) 46 47 #define list_for_each_entry_lockless(pos, head, member) \ 48 list_for_each_entry_rcu(pos, head, member) 49 50 static inline void 51 linux_list_add_rcu(struct list_head *new, struct list_head *prev, 52 struct list_head *next) 53 { 54 new->next = next; 55 new->prev = prev; 56 rcu_assign_pointer(list_next_rcu(prev), new); 57 next->prev = new; 58 } 59 60 static inline void 61 list_add_rcu(struct list_head *new, struct list_head *head) 62 { 63 linux_list_add_rcu(new, head, head->next); 64 } 65 66 static inline void 67 list_add_tail_rcu(struct list_head *new, struct list_head *head) 68 { 69 linux_list_add_rcu(new, head->prev, head); 70 } 71 72 static inline void 73 __list_del_rcu(struct list_head *prev, struct list_head *next) 74 { 75 next->prev = prev; 76 rcu_assign_pointer(list_next_rcu(prev), next); 77 } 78 79 static inline void 80 __list_del_entry_rcu(struct list_head *entry) 81 { 82 __list_del_rcu(entry->prev, entry->next); 83 } 84 85 static inline void 86 list_del_rcu(struct list_head *entry) 87 { 88 __list_del_rcu(entry->prev, entry->next); 89 } 90 91 #define hlist_first_rcu(head) (*((struct hlist_node **)(&(head)->first))) 92 #define hlist_next_rcu(node) (*((struct hlist_node **)(&(node)->next))) 93 #define hlist_pprev_rcu(node) (*((struct hlist_node **)((node)->pprev))) 94 95 static inline void 96 hlist_add_behind_rcu(struct hlist_node *n, struct hlist_node *prev) 97 { 98 n->next = prev->next; 99 n->pprev = &prev->next; 100 rcu_assign_pointer(hlist_next_rcu(prev), n); 101 if (n->next) 102 n->next->pprev = &n->next; 103 } 104 105 #define hlist_for_each_entry_rcu(pos, head, member) \ 106 for (pos = hlist_entry_safe (rcu_dereference_raw(hlist_first_rcu(head)),\ 107 typeof(*(pos)), member); \ 108 (pos); \ 109 pos = hlist_entry_safe(rcu_dereference_raw(hlist_next_rcu( \ 110 &(pos)->member)), typeof(*(pos)), member)) 111 112 static inline void 113 hlist_del_rcu(struct hlist_node *n) 114 { 115 struct hlist_node *next = n->next; 116 struct hlist_node **pprev = n->pprev; 117 118 WRITE_ONCE(*pprev, next); 119 if (next) 120 next->pprev = pprev; 121 } 122 123 static inline void 124 hlist_add_head_rcu(struct hlist_node *n, struct hlist_head *h) 125 { 126 struct hlist_node *first = h->first; 127 128 n->next = first; 129 n->pprev = &h->first; 130 rcu_assign_pointer(hlist_first_rcu(h), n); 131 if (first) 132 first->pprev = &n->next; 133 } 134 135 static inline void 136 hlist_del_init_rcu(struct hlist_node *n) 137 { 138 if (!hlist_unhashed(n)) { 139 hlist_del_rcu(n); 140 n->pprev = NULL; 141 } 142 } 143 144 #endif /* _LINUX_RCULIST_H_ */ 145