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1 | /* |
2 | * lib/plist.c |
3 | * |
4 | * Descending-priority-sorted double-linked list |
5 | * |
6 | * (C) 2002-2003 Intel Corp |
7 | * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>. |
8 | * |
9 | * 2001-2005 (c) MontaVista Software, Inc. |
10 | * Daniel Walker <dwalker@mvista.com> |
11 | * |
12 | * (C) 2005 Thomas Gleixner <tglx@linutronix.de> |
13 | * |
14 | * Simplifications of the original code by |
15 | * Oleg Nesterov <oleg@tv-sign.ru> |
16 | * |
17 | * Licensed under the FSF's GNU Public License v2 or later. |
18 | * |
19 | * Based on simple lists (include/linux/list.h). |
20 | * |
21 | * This file contains the add / del functions which are considered to |
22 | * be too large to inline. See include/linux/plist.h for further |
23 | * information. |
24 | */ |
25 | |
26 | #include <linux/plist.h> |
27 | #include <linux/spinlock.h> |
28 | |
29 | #ifdef CONFIG_DEBUG_PI_LIST |
30 | |
31 | static struct plist_head test_head; |
32 | |
33 | static void plist_check_prev_next(struct list_head *t, struct list_head *p, |
34 | struct list_head *n) |
35 | { |
36 | WARN(n->prev != p || p->next != n, |
37 | "top: %p, n: %p, p: %p\n" |
38 | "prev: %p, n: %p, p: %p\n" |
39 | "next: %p, n: %p, p: %p\n", |
40 | t, t->next, t->prev, |
41 | p, p->next, p->prev, |
42 | n, n->next, n->prev); |
43 | } |
44 | |
45 | static void plist_check_list(struct list_head *top) |
46 | { |
47 | struct list_head *prev = top, *next = top->next; |
48 | |
49 | plist_check_prev_next(top, prev, next); |
50 | while (next != top) { |
51 | prev = next; |
52 | next = prev->next; |
53 | plist_check_prev_next(top, prev, next); |
54 | } |
55 | } |
56 | |
57 | static void plist_check_head(struct plist_head *head) |
58 | { |
59 | WARN_ON(head != &test_head && !head->rawlock && !head->spinlock); |
60 | if (head->rawlock) |
61 | WARN_ON_SMP(!raw_spin_is_locked(head->rawlock)); |
62 | if (head->spinlock) |
63 | WARN_ON_SMP(!spin_is_locked(head->spinlock)); |
64 | if (!plist_head_empty(head)) |
65 | plist_check_list(&plist_first(head)->prio_list); |
66 | plist_check_list(&head->node_list); |
67 | } |
68 | |
69 | #else |
70 | # define plist_check_head(h) do { } while (0) |
71 | #endif |
72 | |
73 | /** |
74 | * plist_add - add @node to @head |
75 | * |
76 | * @node: &struct plist_node pointer |
77 | * @head: &struct plist_head pointer |
78 | */ |
79 | void plist_add(struct plist_node *node, struct plist_head *head) |
80 | { |
81 | struct plist_node *first, *iter, *prev = NULL; |
82 | struct list_head *node_next = &head->node_list; |
83 | |
84 | plist_check_head(head); |
85 | WARN_ON(!plist_node_empty(node)); |
86 | WARN_ON(!list_empty(&node->prio_list)); |
87 | |
88 | if (plist_head_empty(head)) |
89 | goto ins_node; |
90 | |
91 | first = iter = plist_first(head); |
92 | |
93 | do { |
94 | if (node->prio < iter->prio) { |
95 | node_next = &iter->node_list; |
96 | break; |
97 | } |
98 | |
99 | prev = iter; |
100 | iter = list_entry(iter->prio_list.next, |
101 | struct plist_node, prio_list); |
102 | } while (iter != first); |
103 | |
104 | if (!prev || prev->prio != node->prio) |
105 | list_add_tail(&node->prio_list, &iter->prio_list); |
106 | ins_node: |
107 | list_add_tail(&node->node_list, node_next); |
108 | |
109 | plist_check_head(head); |
110 | } |
111 | |
112 | /** |
113 | * plist_del - Remove a @node from plist. |
114 | * |
115 | * @node: &struct plist_node pointer - entry to be removed |
116 | * @head: &struct plist_head pointer - list head |
117 | */ |
118 | void plist_del(struct plist_node *node, struct plist_head *head) |
119 | { |
120 | plist_check_head(head); |
121 | |
122 | if (!list_empty(&node->prio_list)) { |
123 | if (node->node_list.next != &head->node_list) { |
124 | struct plist_node *next; |
125 | |
126 | next = list_entry(node->node_list.next, |
127 | struct plist_node, node_list); |
128 | |
129 | /* add the next plist_node into prio_list */ |
130 | if (list_empty(&next->prio_list)) |
131 | list_add(&next->prio_list, &node->prio_list); |
132 | } |
133 | list_del_init(&node->prio_list); |
134 | } |
135 | |
136 | list_del_init(&node->node_list); |
137 | |
138 | plist_check_head(head); |
139 | } |
140 | |
141 | #ifdef CONFIG_DEBUG_PI_LIST |
142 | #include <linux/sched.h> |
143 | #include <linux/module.h> |
144 | #include <linux/init.h> |
145 | |
146 | static struct plist_node __initdata test_node[241]; |
147 | |
148 | static void __init plist_test_check(int nr_expect) |
149 | { |
150 | struct plist_node *first, *prio_pos, *node_pos; |
151 | |
152 | if (plist_head_empty(&test_head)) { |
153 | BUG_ON(nr_expect != 0); |
154 | return; |
155 | } |
156 | |
157 | prio_pos = first = plist_first(&test_head); |
158 | plist_for_each(node_pos, &test_head) { |
159 | if (nr_expect-- < 0) |
160 | break; |
161 | if (node_pos == first) |
162 | continue; |
163 | if (node_pos->prio == prio_pos->prio) { |
164 | BUG_ON(!list_empty(&node_pos->prio_list)); |
165 | continue; |
166 | } |
167 | |
168 | BUG_ON(prio_pos->prio > node_pos->prio); |
169 | BUG_ON(prio_pos->prio_list.next != &node_pos->prio_list); |
170 | prio_pos = node_pos; |
171 | } |
172 | |
173 | BUG_ON(nr_expect != 0); |
174 | BUG_ON(prio_pos->prio_list.next != &first->prio_list); |
175 | } |
176 | |
177 | static int __init plist_test(void) |
178 | { |
179 | int nr_expect = 0, i, loop; |
180 | unsigned int r = local_clock(); |
181 | |
182 | printk(KERN_INFO "start plist test\n"); |
183 | plist_head_init(&test_head, NULL); |
184 | for (i = 0; i < ARRAY_SIZE(test_node); i++) |
185 | plist_node_init(test_node + i, 0); |
186 | |
187 | for (loop = 0; loop < 1000; loop++) { |
188 | r = r * 193939 % 47629; |
189 | i = r % ARRAY_SIZE(test_node); |
190 | if (plist_node_empty(test_node + i)) { |
191 | r = r * 193939 % 47629; |
192 | test_node[i].prio = r % 99; |
193 | plist_add(test_node + i, &test_head); |
194 | nr_expect++; |
195 | } else { |
196 | plist_del(test_node + i, &test_head); |
197 | nr_expect--; |
198 | } |
199 | plist_test_check(nr_expect); |
200 | } |
201 | |
202 | for (i = 0; i < ARRAY_SIZE(test_node); i++) { |
203 | if (plist_node_empty(test_node + i)) |
204 | continue; |
205 | plist_del(test_node + i, &test_head); |
206 | nr_expect--; |
207 | plist_test_check(nr_expect); |
208 | } |
209 | |
210 | printk(KERN_INFO "end plist test\n"); |
211 | return 0; |
212 | } |
213 | |
214 | module_init(plist_test); |
215 | |
216 | #endif |
217 |
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