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1408 | serge | 1 | #ifndef _LINUX_LIST_H |
2 | #define _LINUX_LIST_H |
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3 | |||
1964 | serge | 4 | #include |
1408 | serge | 5 | #include |
1964 | serge | 6 | #include |
1408 | serge | 7 | |
8 | /* |
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9 | * Simple doubly linked list implementation. |
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10 | * |
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11 | * Some of the internal functions ("__xxx") are useful when |
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12 | * manipulating whole lists rather than single entries, as |
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13 | * sometimes we already know the next/prev entries and we can |
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14 | * generate better code by using them directly rather than |
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15 | * using the generic single-entry routines. |
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16 | */ |
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17 | |||
18 | #define LIST_HEAD_INIT(name) { &(name), &(name) } |
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19 | |||
20 | #define LIST_HEAD(name) \ |
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21 | struct list_head name = LIST_HEAD_INIT(name) |
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22 | |||
23 | static inline void INIT_LIST_HEAD(struct list_head *list) |
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24 | { |
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25 | list->next = list; |
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26 | list->prev = list; |
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27 | } |
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28 | |||
29 | /* |
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30 | * Insert a new entry between two known consecutive entries. |
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31 | * |
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32 | * This is only for internal list manipulation where we know |
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33 | * the prev/next entries already! |
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34 | */ |
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35 | #ifndef CONFIG_DEBUG_LIST |
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36 | static inline void __list_add(struct list_head *new, |
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37 | struct list_head *prev, |
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38 | struct list_head *next) |
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39 | { |
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40 | next->prev = new; |
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41 | new->next = next; |
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42 | new->prev = prev; |
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43 | prev->next = new; |
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44 | } |
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45 | #else |
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46 | extern void __list_add(struct list_head *new, |
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47 | struct list_head *prev, |
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48 | struct list_head *next); |
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49 | #endif |
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50 | |||
51 | /** |
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52 | * list_add - add a new entry |
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53 | * @new: new entry to be added |
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54 | * @head: list head to add it after |
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55 | * |
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56 | * Insert a new entry after the specified head. |
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57 | * This is good for implementing stacks. |
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58 | */ |
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59 | static inline void list_add(struct list_head *new, struct list_head *head) |
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60 | { |
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61 | __list_add(new, head, head->next); |
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62 | } |
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63 | |||
64 | |||
65 | /** |
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66 | * list_add_tail - add a new entry |
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67 | * @new: new entry to be added |
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68 | * @head: list head to add it before |
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69 | * |
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70 | * Insert a new entry before the specified head. |
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71 | * This is useful for implementing queues. |
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72 | */ |
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73 | static inline void list_add_tail(struct list_head *new, struct list_head *head) |
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74 | { |
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75 | __list_add(new, head->prev, head); |
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76 | } |
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77 | |||
78 | /* |
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79 | * Delete a list entry by making the prev/next entries |
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80 | * point to each other. |
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81 | * |
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82 | * This is only for internal list manipulation where we know |
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83 | * the prev/next entries already! |
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84 | */ |
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85 | static inline void __list_del(struct list_head * prev, struct list_head * next) |
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86 | { |
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87 | next->prev = prev; |
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88 | prev->next = next; |
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89 | } |
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90 | |||
91 | /** |
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92 | * list_del - deletes entry from list. |
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93 | * @entry: the element to delete from the list. |
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94 | * Note: list_empty() on entry does not return true after this, the entry is |
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95 | * in an undefined state. |
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96 | */ |
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97 | #ifndef CONFIG_DEBUG_LIST |
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1970 | serge | 98 | static inline void __list_del_entry(struct list_head *entry) |
99 | { |
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100 | __list_del(entry->prev, entry->next); |
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101 | } |
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102 | |||
1408 | serge | 103 | static inline void list_del(struct list_head *entry) |
104 | { |
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105 | __list_del(entry->prev, entry->next); |
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106 | entry->next = LIST_POISON1; |
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107 | entry->prev = LIST_POISON2; |
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108 | } |
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109 | #else |
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1970 | serge | 110 | extern void __list_del_entry(struct list_head *entry); |
1408 | serge | 111 | extern void list_del(struct list_head *entry); |
112 | #endif |
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113 | |||
114 | /** |
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115 | * list_replace - replace old entry by new one |
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116 | * @old : the element to be replaced |
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117 | * @new : the new element to insert |
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118 | * |
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119 | * If @old was empty, it will be overwritten. |
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120 | */ |
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121 | static inline void list_replace(struct list_head *old, |
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122 | struct list_head *new) |
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123 | { |
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124 | new->next = old->next; |
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125 | new->next->prev = new; |
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126 | new->prev = old->prev; |
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127 | new->prev->next = new; |
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128 | } |
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129 | |||
130 | static inline void list_replace_init(struct list_head *old, |
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131 | struct list_head *new) |
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132 | { |
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133 | list_replace(old, new); |
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134 | INIT_LIST_HEAD(old); |
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135 | } |
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136 | |||
137 | /** |
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138 | * list_del_init - deletes entry from list and reinitialize it. |
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139 | * @entry: the element to delete from the list. |
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140 | */ |
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141 | static inline void list_del_init(struct list_head *entry) |
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142 | { |
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1970 | serge | 143 | __list_del_entry(entry); |
1408 | serge | 144 | INIT_LIST_HEAD(entry); |
145 | } |
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146 | |||
147 | /** |
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148 | * list_move - delete from one list and add as another's head |
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149 | * @list: the entry to move |
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150 | * @head: the head that will precede our entry |
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151 | */ |
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152 | static inline void list_move(struct list_head *list, struct list_head *head) |
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153 | { |
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1970 | serge | 154 | __list_del_entry(list); |
1408 | serge | 155 | list_add(list, head); |
156 | } |
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157 | |||
158 | /** |
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159 | * list_move_tail - delete from one list and add as another's tail |
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160 | * @list: the entry to move |
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161 | * @head: the head that will follow our entry |
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162 | */ |
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163 | static inline void list_move_tail(struct list_head *list, |
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164 | struct list_head *head) |
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165 | { |
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1970 | serge | 166 | __list_del_entry(list); |
1408 | serge | 167 | list_add_tail(list, head); |
168 | } |
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169 | |||
170 | /** |
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171 | * list_is_last - tests whether @list is the last entry in list @head |
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172 | * @list: the entry to test |
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173 | * @head: the head of the list |
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174 | */ |
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175 | static inline int list_is_last(const struct list_head *list, |
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176 | const struct list_head *head) |
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177 | { |
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178 | return list->next == head; |
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179 | } |
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180 | |||
181 | /** |
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182 | * list_empty - tests whether a list is empty |
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183 | * @head: the list to test. |
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184 | */ |
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185 | static inline int list_empty(const struct list_head *head) |
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186 | { |
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187 | return head->next == head; |
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188 | } |
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189 | |||
190 | /** |
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191 | * list_empty_careful - tests whether a list is empty and not being modified |
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192 | * @head: the list to test |
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193 | * |
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194 | * Description: |
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195 | * tests whether a list is empty _and_ checks that no other CPU might be |
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196 | * in the process of modifying either member (next or prev) |
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197 | * |
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198 | * NOTE: using list_empty_careful() without synchronization |
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199 | * can only be safe if the only activity that can happen |
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200 | * to the list entry is list_del_init(). Eg. it cannot be used |
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201 | * if another CPU could re-list_add() it. |
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202 | */ |
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203 | static inline int list_empty_careful(const struct list_head *head) |
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204 | { |
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3297 | Serge | 205 | struct list_head *next = head->next; |
1408 | serge | 206 | return (next == head) && (next == head->prev); |
207 | } |
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208 | |||
209 | /** |
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1964 | serge | 210 | * list_rotate_left - rotate the list to the left |
211 | * @head: the head of the list |
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212 | */ |
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213 | static inline void list_rotate_left(struct list_head *head) |
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214 | { |
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215 | struct list_head *first; |
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216 | |||
217 | if (!list_empty(head)) { |
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218 | first = head->next; |
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219 | list_move_tail(first, head); |
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220 | } |
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221 | } |
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222 | |||
223 | /** |
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1408 | serge | 224 | * list_is_singular - tests whether a list has just one entry. |
225 | * @head: the list to test. |
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226 | */ |
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227 | static inline int list_is_singular(const struct list_head *head) |
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228 | { |
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229 | return !list_empty(head) && (head->next == head->prev); |
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230 | } |
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231 | |||
232 | static inline void __list_cut_position(struct list_head *list, |
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233 | struct list_head *head, struct list_head *entry) |
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234 | { |
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235 | struct list_head *new_first = entry->next; |
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236 | list->next = head->next; |
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237 | list->next->prev = list; |
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238 | list->prev = entry; |
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239 | entry->next = list; |
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240 | head->next = new_first; |
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241 | new_first->prev = head; |
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242 | } |
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243 | |||
244 | /** |
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245 | * list_cut_position - cut a list into two |
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246 | * @list: a new list to add all removed entries |
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247 | * @head: a list with entries |
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248 | * @entry: an entry within head, could be the head itself |
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249 | * and if so we won't cut the list |
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250 | * |
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251 | * This helper moves the initial part of @head, up to and |
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252 | * including @entry, from @head to @list. You should |
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253 | * pass on @entry an element you know is on @head. @list |
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254 | * should be an empty list or a list you do not care about |
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255 | * losing its data. |
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256 | * |
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257 | */ |
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258 | static inline void list_cut_position(struct list_head *list, |
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259 | struct list_head *head, struct list_head *entry) |
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260 | { |
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261 | if (list_empty(head)) |
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262 | return; |
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263 | if (list_is_singular(head) && |
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264 | (head->next != entry && head != entry)) |
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265 | return; |
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266 | if (entry == head) |
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267 | INIT_LIST_HEAD(list); |
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268 | else |
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269 | __list_cut_position(list, head, entry); |
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270 | } |
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271 | |||
272 | static inline void __list_splice(const struct list_head *list, |
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273 | struct list_head *prev, |
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274 | struct list_head *next) |
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275 | { |
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276 | struct list_head *first = list->next; |
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277 | struct list_head *last = list->prev; |
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278 | |||
279 | first->prev = prev; |
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280 | prev->next = first; |
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281 | |||
282 | last->next = next; |
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283 | next->prev = last; |
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284 | } |
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285 | |||
286 | /** |
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287 | * list_splice - join two lists, this is designed for stacks |
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288 | * @list: the new list to add. |
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289 | * @head: the place to add it in the first list. |
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290 | */ |
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291 | static inline void list_splice(const struct list_head *list, |
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292 | struct list_head *head) |
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293 | { |
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294 | if (!list_empty(list)) |
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295 | __list_splice(list, head, head->next); |
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296 | } |
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297 | |||
298 | /** |
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299 | * list_splice_tail - join two lists, each list being a queue |
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300 | * @list: the new list to add. |
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301 | * @head: the place to add it in the first list. |
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302 | */ |
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303 | static inline void list_splice_tail(struct list_head *list, |
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304 | struct list_head *head) |
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305 | { |
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306 | if (!list_empty(list)) |
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307 | __list_splice(list, head->prev, head); |
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308 | } |
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309 | |||
310 | /** |
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311 | * list_splice_init - join two lists and reinitialise the emptied list. |
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312 | * @list: the new list to add. |
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313 | * @head: the place to add it in the first list. |
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314 | * |
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315 | * The list at @list is reinitialised |
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316 | */ |
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317 | static inline void list_splice_init(struct list_head *list, |
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318 | struct list_head *head) |
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319 | { |
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320 | if (!list_empty(list)) { |
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321 | __list_splice(list, head, head->next); |
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322 | INIT_LIST_HEAD(list); |
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323 | } |
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324 | } |
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325 | |||
326 | /** |
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327 | * list_splice_tail_init - join two lists and reinitialise the emptied list |
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328 | * @list: the new list to add. |
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329 | * @head: the place to add it in the first list. |
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330 | * |
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331 | * Each of the lists is a queue. |
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332 | * The list at @list is reinitialised |
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333 | */ |
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334 | static inline void list_splice_tail_init(struct list_head *list, |
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335 | struct list_head *head) |
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336 | { |
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337 | if (!list_empty(list)) { |
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338 | __list_splice(list, head->prev, head); |
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339 | INIT_LIST_HEAD(list); |
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340 | } |
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341 | } |
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342 | |||
343 | /** |
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344 | * list_entry - get the struct for this entry |
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345 | * @ptr: the &struct list_head pointer. |
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346 | * @type: the type of the struct this is embedded in. |
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347 | * @member: the name of the list_struct within the struct. |
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348 | */ |
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349 | #define list_entry(ptr, type, member) \ |
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350 | container_of(ptr, type, member) |
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351 | |||
352 | /** |
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353 | * list_first_entry - get the first element from a list |
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354 | * @ptr: the list head to take the element from. |
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355 | * @type: the type of the struct this is embedded in. |
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356 | * @member: the name of the list_struct within the struct. |
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357 | * |
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358 | * Note, that list is expected to be not empty. |
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359 | */ |
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360 | #define list_first_entry(ptr, type, member) \ |
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361 | list_entry((ptr)->next, type, member) |
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362 | |||
363 | /** |
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4065 | Serge | 364 | * list_first_entry_or_null - get the first element from a list |
365 | * @ptr: the list head to take the element from. |
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366 | * @type: the type of the struct this is embedded in. |
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367 | * @member: the name of the list_struct within the struct. |
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368 | * |
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369 | * Note that if the list is empty, it returns NULL. |
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1408 | serge | 370 | */ |
4065 | Serge | 371 | #define list_first_entry_or_null(ptr, type, member) \ |
372 | (!list_empty(ptr) ? list_first_entry(ptr, type, member) : NULL) |
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1408 | serge | 373 | |
374 | /** |
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4065 | Serge | 375 | * list_for_each - iterate over a list |
1408 | serge | 376 | * @pos: the &struct list_head to use as a loop cursor. |
377 | * @head: the head for your list. |
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378 | */ |
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4065 | Serge | 379 | #define list_for_each(pos, head) \ |
1408 | serge | 380 | for (pos = (head)->next; pos != (head); pos = pos->next) |
381 | |||
382 | /** |
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383 | * list_for_each_prev - iterate over a list backwards |
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384 | * @pos: the &struct list_head to use as a loop cursor. |
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385 | * @head: the head for your list. |
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386 | */ |
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387 | #define list_for_each_prev(pos, head) \ |
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1970 | serge | 388 | for (pos = (head)->prev; pos != (head); pos = pos->prev) |
1408 | serge | 389 | |
390 | /** |
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391 | * list_for_each_safe - iterate over a list safe against removal of list entry |
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392 | * @pos: the &struct list_head to use as a loop cursor. |
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393 | * @n: another &struct list_head to use as temporary storage |
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394 | * @head: the head for your list. |
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395 | */ |
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396 | #define list_for_each_safe(pos, n, head) \ |
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397 | for (pos = (head)->next, n = pos->next; pos != (head); \ |
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398 | pos = n, n = pos->next) |
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399 | |||
400 | /** |
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401 | * list_for_each_prev_safe - iterate over a list backwards safe against removal of list entry |
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402 | * @pos: the &struct list_head to use as a loop cursor. |
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403 | * @n: another &struct list_head to use as temporary storage |
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404 | * @head: the head for your list. |
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405 | */ |
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406 | #define list_for_each_prev_safe(pos, n, head) \ |
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407 | for (pos = (head)->prev, n = pos->prev; \ |
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1970 | serge | 408 | pos != (head); \ |
1408 | serge | 409 | pos = n, n = pos->prev) |
410 | |||
411 | /** |
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412 | * list_for_each_entry - iterate over list of given type |
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413 | * @pos: the type * to use as a loop cursor. |
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414 | * @head: the head for your list. |
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415 | * @member: the name of the list_struct within the struct. |
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416 | */ |
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417 | #define list_for_each_entry(pos, head, member) \ |
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418 | for (pos = list_entry((head)->next, typeof(*pos), member); \ |
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1970 | serge | 419 | &pos->member != (head); \ |
1408 | serge | 420 | pos = list_entry(pos->member.next, typeof(*pos), member)) |
421 | |||
422 | /** |
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423 | * list_for_each_entry_reverse - iterate backwards over list of given type. |
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424 | * @pos: the type * to use as a loop cursor. |
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425 | * @head: the head for your list. |
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426 | * @member: the name of the list_struct within the struct. |
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427 | */ |
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428 | #define list_for_each_entry_reverse(pos, head, member) \ |
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429 | for (pos = list_entry((head)->prev, typeof(*pos), member); \ |
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1970 | serge | 430 | &pos->member != (head); \ |
1408 | serge | 431 | pos = list_entry(pos->member.prev, typeof(*pos), member)) |
432 | |||
433 | /** |
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434 | * list_prepare_entry - prepare a pos entry for use in list_for_each_entry_continue() |
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435 | * @pos: the type * to use as a start point |
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436 | * @head: the head of the list |
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437 | * @member: the name of the list_struct within the struct. |
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438 | * |
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439 | * Prepares a pos entry for use as a start point in list_for_each_entry_continue(). |
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440 | */ |
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441 | #define list_prepare_entry(pos, head, member) \ |
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442 | ((pos) ? : list_entry(head, typeof(*pos), member)) |
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443 | |||
444 | /** |
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445 | * list_for_each_entry_continue - continue iteration over list of given type |
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446 | * @pos: the type * to use as a loop cursor. |
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447 | * @head: the head for your list. |
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448 | * @member: the name of the list_struct within the struct. |
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449 | * |
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450 | * Continue to iterate over list of given type, continuing after |
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451 | * the current position. |
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452 | */ |
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453 | #define list_for_each_entry_continue(pos, head, member) \ |
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454 | for (pos = list_entry(pos->member.next, typeof(*pos), member); \ |
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1970 | serge | 455 | &pos->member != (head); \ |
1408 | serge | 456 | pos = list_entry(pos->member.next, typeof(*pos), member)) |
457 | |||
458 | /** |
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459 | * list_for_each_entry_continue_reverse - iterate backwards from the given point |
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460 | * @pos: the type * to use as a loop cursor. |
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461 | * @head: the head for your list. |
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462 | * @member: the name of the list_struct within the struct. |
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463 | * |
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464 | * Start to iterate over list of given type backwards, continuing after |
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465 | * the current position. |
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466 | */ |
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467 | #define list_for_each_entry_continue_reverse(pos, head, member) \ |
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468 | for (pos = list_entry(pos->member.prev, typeof(*pos), member); \ |
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1970 | serge | 469 | &pos->member != (head); \ |
1408 | serge | 470 | pos = list_entry(pos->member.prev, typeof(*pos), member)) |
471 | |||
472 | /** |
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473 | * list_for_each_entry_from - iterate over list of given type from the current point |
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474 | * @pos: the type * to use as a loop cursor. |
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475 | * @head: the head for your list. |
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476 | * @member: the name of the list_struct within the struct. |
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477 | * |
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478 | * Iterate over list of given type, continuing from current position. |
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479 | */ |
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480 | #define list_for_each_entry_from(pos, head, member) \ |
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1970 | serge | 481 | for (; &pos->member != (head); \ |
1408 | serge | 482 | pos = list_entry(pos->member.next, typeof(*pos), member)) |
483 | |||
484 | /** |
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485 | * list_for_each_entry_safe - iterate over list of given type safe against removal of list entry |
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486 | * @pos: the type * to use as a loop cursor. |
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487 | * @n: another type * to use as temporary storage |
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488 | * @head: the head for your list. |
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489 | * @member: the name of the list_struct within the struct. |
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490 | */ |
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491 | #define list_for_each_entry_safe(pos, n, head, member) \ |
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492 | for (pos = list_entry((head)->next, typeof(*pos), member), \ |
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493 | n = list_entry(pos->member.next, typeof(*pos), member); \ |
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494 | &pos->member != (head); \ |
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495 | pos = n, n = list_entry(n->member.next, typeof(*n), member)) |
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496 | |||
497 | /** |
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1964 | serge | 498 | * list_for_each_entry_safe_continue - continue list iteration safe against removal |
1408 | serge | 499 | * @pos: the type * to use as a loop cursor. |
500 | * @n: another type * to use as temporary storage |
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501 | * @head: the head for your list. |
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502 | * @member: the name of the list_struct within the struct. |
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503 | * |
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504 | * Iterate over list of given type, continuing after current point, |
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505 | * safe against removal of list entry. |
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506 | */ |
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507 | #define list_for_each_entry_safe_continue(pos, n, head, member) \ |
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508 | for (pos = list_entry(pos->member.next, typeof(*pos), member), \ |
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509 | n = list_entry(pos->member.next, typeof(*pos), member); \ |
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510 | &pos->member != (head); \ |
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511 | pos = n, n = list_entry(n->member.next, typeof(*n), member)) |
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512 | |||
513 | /** |
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1964 | serge | 514 | * list_for_each_entry_safe_from - iterate over list from current point safe against removal |
1408 | serge | 515 | * @pos: the type * to use as a loop cursor. |
516 | * @n: another type * to use as temporary storage |
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517 | * @head: the head for your list. |
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518 | * @member: the name of the list_struct within the struct. |
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519 | * |
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520 | * Iterate over list of given type from current point, safe against |
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521 | * removal of list entry. |
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522 | */ |
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523 | #define list_for_each_entry_safe_from(pos, n, head, member) \ |
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524 | for (n = list_entry(pos->member.next, typeof(*pos), member); \ |
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525 | &pos->member != (head); \ |
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526 | pos = n, n = list_entry(n->member.next, typeof(*n), member)) |
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527 | |||
528 | /** |
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1964 | serge | 529 | * list_for_each_entry_safe_reverse - iterate backwards over list safe against removal |
1408 | serge | 530 | * @pos: the type * to use as a loop cursor. |
531 | * @n: another type * to use as temporary storage |
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532 | * @head: the head for your list. |
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533 | * @member: the name of the list_struct within the struct. |
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534 | * |
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535 | * Iterate backwards over list of given type, safe against removal |
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536 | * of list entry. |
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537 | */ |
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538 | #define list_for_each_entry_safe_reverse(pos, n, head, member) \ |
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539 | for (pos = list_entry((head)->prev, typeof(*pos), member), \ |
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540 | n = list_entry(pos->member.prev, typeof(*pos), member); \ |
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541 | &pos->member != (head); \ |
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542 | pos = n, n = list_entry(n->member.prev, typeof(*n), member)) |
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543 | |||
1964 | serge | 544 | /** |
545 | * list_safe_reset_next - reset a stale list_for_each_entry_safe loop |
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546 | * @pos: the loop cursor used in the list_for_each_entry_safe loop |
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547 | * @n: temporary storage used in list_for_each_entry_safe |
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548 | * @member: the name of the list_struct within the struct. |
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549 | * |
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550 | * list_safe_reset_next is not safe to use in general if the list may be |
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551 | * modified concurrently (eg. the lock is dropped in the loop body). An |
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552 | * exception to this is if the cursor element (pos) is pinned in the list, |
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553 | * and list_safe_reset_next is called after re-taking the lock and before |
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554 | * completing the current iteration of the loop body. |
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555 | */ |
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556 | #define list_safe_reset_next(pos, n, member) \ |
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557 | n = list_entry(pos->member.next, typeof(*pos), member) |
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558 | |||
1408 | serge | 559 | /* |
560 | * Double linked lists with a single pointer list head. |
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561 | * Mostly useful for hash tables where the two pointer list head is |
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562 | * too wasteful. |
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563 | * You lose the ability to access the tail in O(1). |
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564 | */ |
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565 | |||
566 | #define HLIST_HEAD_INIT { .first = NULL } |
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567 | #define HLIST_HEAD(name) struct hlist_head name = { .first = NULL } |
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568 | #define INIT_HLIST_HEAD(ptr) ((ptr)->first = NULL) |
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569 | static inline void INIT_HLIST_NODE(struct hlist_node *h) |
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570 | { |
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571 | h->next = NULL; |
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572 | h->pprev = NULL; |
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573 | } |
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574 | |||
575 | static inline int hlist_unhashed(const struct hlist_node *h) |
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576 | { |
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577 | return !h->pprev; |
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578 | } |
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579 | |||
580 | static inline int hlist_empty(const struct hlist_head *h) |
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581 | { |
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582 | return !h->first; |
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583 | } |
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584 | |||
585 | static inline void __hlist_del(struct hlist_node *n) |
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586 | { |
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587 | struct hlist_node *next = n->next; |
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588 | struct hlist_node **pprev = n->pprev; |
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589 | *pprev = next; |
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590 | if (next) |
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591 | next->pprev = pprev; |
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592 | } |
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593 | |||
594 | static inline void hlist_del(struct hlist_node *n) |
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595 | { |
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596 | __hlist_del(n); |
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1964 | serge | 597 | n->next = LIST_POISON1; |
598 | n->pprev = LIST_POISON2; |
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1408 | serge | 599 | } |
600 | |||
601 | static inline void hlist_del_init(struct hlist_node *n) |
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602 | { |
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603 | if (!hlist_unhashed(n)) { |
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604 | __hlist_del(n); |
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605 | INIT_HLIST_NODE(n); |
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606 | } |
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607 | } |
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608 | |||
609 | static inline void hlist_add_head(struct hlist_node *n, struct hlist_head *h) |
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610 | { |
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611 | struct hlist_node *first = h->first; |
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612 | n->next = first; |
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613 | if (first) |
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614 | first->pprev = &n->next; |
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615 | h->first = n; |
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616 | n->pprev = &h->first; |
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617 | } |
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618 | |||
619 | /* next must be != NULL */ |
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620 | static inline void hlist_add_before(struct hlist_node *n, |
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621 | struct hlist_node *next) |
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622 | { |
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623 | n->pprev = next->pprev; |
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624 | n->next = next; |
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625 | next->pprev = &n->next; |
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626 | *(n->pprev) = n; |
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627 | } |
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628 | |||
629 | static inline void hlist_add_after(struct hlist_node *n, |
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630 | struct hlist_node *next) |
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631 | { |
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632 | next->next = n->next; |
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633 | n->next = next; |
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634 | next->pprev = &n->next; |
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635 | |||
636 | if(next->next) |
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637 | next->next->pprev = &next->next; |
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638 | } |
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639 | |||
1964 | serge | 640 | /* after that we'll appear to be on some hlist and hlist_del will work */ |
641 | static inline void hlist_add_fake(struct hlist_node *n) |
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642 | { |
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643 | n->pprev = &n->next; |
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644 | } |
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645 | |||
1408 | serge | 646 | /* |
647 | * Move a list from one list head to another. Fixup the pprev |
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648 | * reference of the first entry if it exists. |
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649 | */ |
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650 | static inline void hlist_move_list(struct hlist_head *old, |
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651 | struct hlist_head *new) |
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652 | { |
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653 | new->first = old->first; |
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654 | if (new->first) |
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655 | new->first->pprev = &new->first; |
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656 | old->first = NULL; |
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657 | } |
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658 | |||
659 | #define hlist_entry(ptr, type, member) container_of(ptr,type,member) |
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660 | |||
661 | #define hlist_for_each(pos, head) \ |
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1970 | serge | 662 | for (pos = (head)->first; pos ; pos = pos->next) |
1408 | serge | 663 | |
664 | #define hlist_for_each_safe(pos, n, head) \ |
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665 | for (pos = (head)->first; pos && ({ n = pos->next; 1; }); \ |
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666 | pos = n) |
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667 | |||
4065 | Serge | 668 | #define hlist_entry_safe(ptr, type, member) \ |
669 | ({ typeof(ptr) ____ptr = (ptr); \ |
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670 | ____ptr ? hlist_entry(____ptr, type, member) : NULL; \ |
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671 | }) |
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672 | |||
1408 | serge | 673 | /** |
674 | * hlist_for_each_entry - iterate over list of given type |
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4065 | Serge | 675 | * @pos: the type * to use as a loop cursor. |
1408 | serge | 676 | * @head: the head for your list. |
677 | * @member: the name of the hlist_node within the struct. |
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678 | */ |
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4065 | Serge | 679 | #define hlist_for_each_entry(pos, head, member) \ |
680 | for (pos = hlist_entry_safe((head)->first, typeof(*(pos)), member);\ |
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681 | pos; \ |
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682 | pos = hlist_entry_safe((pos)->member.next, typeof(*(pos)), member)) |
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1408 | serge | 683 | |
684 | /** |
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685 | * hlist_for_each_entry_continue - iterate over a hlist continuing after current point |
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4065 | Serge | 686 | * @pos: the type * to use as a loop cursor. |
1408 | serge | 687 | * @member: the name of the hlist_node within the struct. |
688 | */ |
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4065 | Serge | 689 | #define hlist_for_each_entry_continue(pos, member) \ |
690 | for (pos = hlist_entry_safe((pos)->member.next, typeof(*(pos)), member);\ |
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691 | pos; \ |
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692 | pos = hlist_entry_safe((pos)->member.next, typeof(*(pos)), member)) |
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1408 | serge | 693 | |
694 | /** |
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695 | * hlist_for_each_entry_from - iterate over a hlist continuing from current point |
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4065 | Serge | 696 | * @pos: the type * to use as a loop cursor. |
1408 | serge | 697 | * @member: the name of the hlist_node within the struct. |
698 | */ |
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4065 | Serge | 699 | #define hlist_for_each_entry_from(pos, member) \ |
700 | for (; pos; \ |
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701 | pos = hlist_entry_safe((pos)->member.next, typeof(*(pos)), member)) |
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1408 | serge | 702 | |
703 | /** |
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704 | * hlist_for_each_entry_safe - iterate over list of given type safe against removal of list entry |
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4065 | Serge | 705 | * @pos: the type * to use as a loop cursor. |
1408 | serge | 706 | * @n: another &struct hlist_node to use as temporary storage |
707 | * @head: the head for your list. |
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708 | * @member: the name of the hlist_node within the struct. |
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709 | */ |
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4065 | Serge | 710 | #define hlist_for_each_entry_safe(pos, n, head, member) \ |
711 | for (pos = hlist_entry_safe((head)->first, typeof(*pos), member);\ |
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712 | pos && ({ n = pos->member.next; 1; }); \ |
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713 | pos = hlist_entry_safe(n, typeof(*pos), member)) |
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1408 | serge | 714 | |
715 | #endif |