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1408 | serge | 1 | /* |
2 | * Runtime locking correctness validator |
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3 | * |
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4 | * Copyright (C) 2006,2007 Red Hat, Inc., Ingo Molnar |
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5 | * Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra |
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6 | * |
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7 | * see Documentation/lockdep-design.txt for more details. |
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8 | */ |
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9 | #ifndef __LINUX_LOCKDEP_H |
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10 | #define __LINUX_LOCKDEP_H |
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11 | |||
12 | struct task_struct; |
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13 | struct lockdep_map; |
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14 | |||
15 | #ifdef CONFIG_LOCKDEP |
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16 | |||
17 | #include |
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18 | #include |
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19 | #include |
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20 | #include |
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21 | |||
22 | /* |
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23 | * We'd rather not expose kernel/lockdep_states.h this wide, but we do need |
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24 | * the total number of states... :-( |
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25 | */ |
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26 | #define XXX_LOCK_USAGE_STATES (1+3*4) |
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27 | |||
28 | #define MAX_LOCKDEP_SUBCLASSES 8UL |
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29 | |||
30 | /* |
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31 | * Lock-classes are keyed via unique addresses, by embedding the |
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32 | * lockclass-key into the kernel (or module) .data section. (For |
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33 | * static locks we use the lock address itself as the key.) |
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34 | */ |
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35 | struct lockdep_subclass_key { |
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36 | char __one_byte; |
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37 | } __attribute__ ((__packed__)); |
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38 | |||
39 | struct lock_class_key { |
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40 | struct lockdep_subclass_key subkeys[MAX_LOCKDEP_SUBCLASSES]; |
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41 | }; |
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42 | |||
43 | #define LOCKSTAT_POINTS 4 |
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44 | |||
45 | /* |
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46 | * The lock-class itself: |
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47 | */ |
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48 | struct lock_class { |
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49 | /* |
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50 | * class-hash: |
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51 | */ |
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52 | struct list_head hash_entry; |
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53 | |||
54 | /* |
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55 | * global list of all lock-classes: |
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56 | */ |
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57 | struct list_head lock_entry; |
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58 | |||
59 | struct lockdep_subclass_key *key; |
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60 | unsigned int subclass; |
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61 | unsigned int dep_gen_id; |
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62 | |||
63 | /* |
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64 | * IRQ/softirq usage tracking bits: |
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65 | */ |
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66 | unsigned long usage_mask; |
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67 | struct stack_trace usage_traces[XXX_LOCK_USAGE_STATES]; |
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68 | |||
69 | /* |
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70 | * These fields represent a directed graph of lock dependencies, |
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71 | * to every node we attach a list of "forward" and a list of |
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72 | * "backward" graph nodes. |
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73 | */ |
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74 | struct list_head locks_after, locks_before; |
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75 | |||
76 | /* |
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77 | * Generation counter, when doing certain classes of graph walking, |
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78 | * to ensure that we check one node only once: |
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79 | */ |
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80 | unsigned int version; |
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81 | |||
82 | /* |
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83 | * Statistics counter: |
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84 | */ |
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85 | unsigned long ops; |
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86 | |||
87 | const char *name; |
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88 | int name_version; |
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89 | |||
90 | #ifdef CONFIG_LOCK_STAT |
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91 | unsigned long contention_point[LOCKSTAT_POINTS]; |
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92 | unsigned long contending_point[LOCKSTAT_POINTS]; |
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93 | #endif |
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94 | }; |
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95 | |||
96 | #ifdef CONFIG_LOCK_STAT |
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97 | struct lock_time { |
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98 | s64 min; |
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99 | s64 max; |
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100 | s64 total; |
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101 | unsigned long nr; |
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102 | }; |
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103 | |||
104 | enum bounce_type { |
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105 | bounce_acquired_write, |
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106 | bounce_acquired_read, |
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107 | bounce_contended_write, |
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108 | bounce_contended_read, |
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109 | nr_bounce_types, |
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110 | |||
111 | bounce_acquired = bounce_acquired_write, |
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112 | bounce_contended = bounce_contended_write, |
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113 | }; |
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114 | |||
115 | struct lock_class_stats { |
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116 | unsigned long contention_point[4]; |
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117 | unsigned long contending_point[4]; |
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118 | struct lock_time read_waittime; |
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119 | struct lock_time write_waittime; |
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120 | struct lock_time read_holdtime; |
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121 | struct lock_time write_holdtime; |
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122 | unsigned long bounces[nr_bounce_types]; |
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123 | }; |
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124 | |||
125 | struct lock_class_stats lock_stats(struct lock_class *class); |
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126 | void clear_lock_stats(struct lock_class *class); |
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127 | #endif |
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128 | |||
129 | /* |
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130 | * Map the lock object (the lock instance) to the lock-class object. |
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131 | * This is embedded into specific lock instances: |
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132 | */ |
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133 | struct lockdep_map { |
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134 | struct lock_class_key *key; |
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135 | struct lock_class *class_cache; |
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136 | const char *name; |
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137 | #ifdef CONFIG_LOCK_STAT |
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138 | int cpu; |
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139 | unsigned long ip; |
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140 | #endif |
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141 | }; |
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142 | |||
143 | /* |
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144 | * Every lock has a list of other locks that were taken after it. |
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145 | * We only grow the list, never remove from it: |
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146 | */ |
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147 | struct lock_list { |
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148 | struct list_head entry; |
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149 | struct lock_class *class; |
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150 | struct stack_trace trace; |
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151 | int distance; |
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152 | |||
153 | /* |
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154 | * The parent field is used to implement breadth-first search, and the |
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155 | * bit 0 is reused to indicate if the lock has been accessed in BFS. |
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156 | */ |
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157 | struct lock_list *parent; |
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158 | }; |
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159 | |||
160 | /* |
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161 | * We record lock dependency chains, so that we can cache them: |
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162 | */ |
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163 | struct lock_chain { |
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164 | u8 irq_context; |
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165 | u8 depth; |
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166 | u16 base; |
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167 | struct list_head entry; |
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168 | u64 chain_key; |
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169 | }; |
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170 | |||
171 | #define MAX_LOCKDEP_KEYS_BITS 13 |
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172 | /* |
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173 | * Subtract one because we offset hlock->class_idx by 1 in order |
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174 | * to make 0 mean no class. This avoids overflowing the class_idx |
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175 | * bitfield and hitting the BUG in hlock_class(). |
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176 | */ |
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177 | #define MAX_LOCKDEP_KEYS ((1UL << MAX_LOCKDEP_KEYS_BITS) - 1) |
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178 | |||
179 | struct held_lock { |
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180 | /* |
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181 | * One-way hash of the dependency chain up to this point. We |
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182 | * hash the hashes step by step as the dependency chain grows. |
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183 | * |
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184 | * We use it for dependency-caching and we skip detection |
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185 | * passes and dependency-updates if there is a cache-hit, so |
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186 | * it is absolutely critical for 100% coverage of the validator |
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187 | * to have a unique key value for every unique dependency path |
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188 | * that can occur in the system, to make a unique hash value |
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189 | * as likely as possible - hence the 64-bit width. |
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190 | * |
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191 | * The task struct holds the current hash value (initialized |
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192 | * with zero), here we store the previous hash value: |
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193 | */ |
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194 | u64 prev_chain_key; |
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195 | unsigned long acquire_ip; |
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196 | struct lockdep_map *instance; |
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197 | struct lockdep_map *nest_lock; |
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198 | #ifdef CONFIG_LOCK_STAT |
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199 | u64 waittime_stamp; |
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200 | u64 holdtime_stamp; |
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201 | #endif |
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202 | unsigned int class_idx:MAX_LOCKDEP_KEYS_BITS; |
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203 | /* |
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204 | * The lock-stack is unified in that the lock chains of interrupt |
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205 | * contexts nest ontop of process context chains, but we 'separate' |
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206 | * the hashes by starting with 0 if we cross into an interrupt |
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207 | * context, and we also keep do not add cross-context lock |
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208 | * dependencies - the lock usage graph walking covers that area |
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209 | * anyway, and we'd just unnecessarily increase the number of |
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210 | * dependencies otherwise. [Note: hardirq and softirq contexts |
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211 | * are separated from each other too.] |
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212 | * |
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213 | * The following field is used to detect when we cross into an |
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214 | * interrupt context: |
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215 | */ |
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216 | unsigned int irq_context:2; /* bit 0 - soft, bit 1 - hard */ |
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217 | unsigned int trylock:1; /* 16 bits */ |
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218 | |||
219 | unsigned int read:2; /* see lock_acquire() comment */ |
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220 | unsigned int check:2; /* see lock_acquire() comment */ |
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221 | unsigned int hardirqs_off:1; |
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222 | unsigned int references:11; /* 32 bits */ |
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223 | }; |
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224 | |||
225 | /* |
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226 | * Initialization, self-test and debugging-output methods: |
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227 | */ |
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228 | extern void lockdep_init(void); |
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229 | extern void lockdep_info(void); |
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230 | extern void lockdep_reset(void); |
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231 | extern void lockdep_reset_lock(struct lockdep_map *lock); |
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232 | extern void lockdep_free_key_range(void *start, unsigned long size); |
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233 | extern void lockdep_sys_exit(void); |
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234 | |||
235 | extern void lockdep_off(void); |
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236 | extern void lockdep_on(void); |
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237 | |||
238 | /* |
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239 | * These methods are used by specific locking variants (spinlocks, |
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240 | * rwlocks, mutexes and rwsems) to pass init/acquire/release events |
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241 | * to lockdep: |
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242 | */ |
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243 | |||
244 | extern void lockdep_init_map(struct lockdep_map *lock, const char *name, |
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245 | struct lock_class_key *key, int subclass); |
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246 | |||
247 | /* |
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248 | * To initialize a lockdep_map statically use this macro. |
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249 | * Note that _name must not be NULL. |
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250 | */ |
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251 | #define STATIC_LOCKDEP_MAP_INIT(_name, _key) \ |
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252 | { .name = (_name), .key = (void *)(_key), } |
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253 | |||
254 | /* |
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255 | * Reinitialize a lock key - for cases where there is special locking or |
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256 | * special initialization of locks so that the validator gets the scope |
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257 | * of dependencies wrong: they are either too broad (they need a class-split) |
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258 | * or they are too narrow (they suffer from a false class-split): |
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259 | */ |
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260 | #define lockdep_set_class(lock, key) \ |
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261 | lockdep_init_map(&(lock)->dep_map, #key, key, 0) |
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262 | #define lockdep_set_class_and_name(lock, key, name) \ |
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263 | lockdep_init_map(&(lock)->dep_map, name, key, 0) |
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264 | #define lockdep_set_class_and_subclass(lock, key, sub) \ |
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265 | lockdep_init_map(&(lock)->dep_map, #key, key, sub) |
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266 | #define lockdep_set_subclass(lock, sub) \ |
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267 | lockdep_init_map(&(lock)->dep_map, #lock, \ |
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268 | (lock)->dep_map.key, sub) |
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269 | /* |
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270 | * Compare locking classes |
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271 | */ |
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272 | #define lockdep_match_class(lock, key) lockdep_match_key(&(lock)->dep_map, key) |
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273 | |||
274 | static inline int lockdep_match_key(struct lockdep_map *lock, |
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275 | struct lock_class_key *key) |
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276 | { |
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277 | return lock->key == key; |
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278 | } |
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279 | |||
280 | /* |
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281 | * Acquire a lock. |
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282 | * |
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283 | * Values for "read": |
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284 | * |
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285 | * 0: exclusive (write) acquire |
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286 | * 1: read-acquire (no recursion allowed) |
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287 | * 2: read-acquire with same-instance recursion allowed |
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288 | * |
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289 | * Values for check: |
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290 | * |
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291 | * 0: disabled |
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292 | * 1: simple checks (freeing, held-at-exit-time, etc.) |
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293 | * 2: full validation |
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294 | */ |
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295 | extern void lock_acquire(struct lockdep_map *lock, unsigned int subclass, |
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296 | int trylock, int read, int check, |
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297 | struct lockdep_map *nest_lock, unsigned long ip); |
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298 | |||
299 | extern void lock_release(struct lockdep_map *lock, int nested, |
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300 | unsigned long ip); |
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301 | |||
302 | #define lockdep_is_held(lock) lock_is_held(&(lock)->dep_map) |
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303 | |||
304 | extern int lock_is_held(struct lockdep_map *lock); |
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305 | |||
306 | extern void lock_set_class(struct lockdep_map *lock, const char *name, |
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307 | struct lock_class_key *key, unsigned int subclass, |
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308 | unsigned long ip); |
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309 | |||
310 | static inline void lock_set_subclass(struct lockdep_map *lock, |
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311 | unsigned int subclass, unsigned long ip) |
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312 | { |
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313 | lock_set_class(lock, lock->name, lock->key, subclass, ip); |
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314 | } |
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315 | |||
316 | extern void lockdep_set_current_reclaim_state(gfp_t gfp_mask); |
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317 | extern void lockdep_clear_current_reclaim_state(void); |
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318 | extern void lockdep_trace_alloc(gfp_t mask); |
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319 | |||
320 | # define INIT_LOCKDEP .lockdep_recursion = 0, .lockdep_reclaim_gfp = 0, |
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321 | |||
322 | #define lockdep_depth(tsk) (debug_locks ? (tsk)->lockdep_depth : 0) |
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323 | |||
324 | #define lockdep_assert_held(l) WARN_ON(debug_locks && !lockdep_is_held(l)) |
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325 | |||
326 | #else /* !LOCKDEP */ |
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327 | |||
328 | static inline void lockdep_off(void) |
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329 | { |
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330 | } |
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331 | |||
332 | static inline void lockdep_on(void) |
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333 | { |
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334 | } |
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335 | |||
336 | # define lock_acquire(l, s, t, r, c, n, i) do { } while (0) |
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337 | # define lock_release(l, n, i) do { } while (0) |
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338 | # define lock_set_class(l, n, k, s, i) do { } while (0) |
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339 | # define lock_set_subclass(l, s, i) do { } while (0) |
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340 | # define lockdep_set_current_reclaim_state(g) do { } while (0) |
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341 | # define lockdep_clear_current_reclaim_state() do { } while (0) |
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342 | # define lockdep_trace_alloc(g) do { } while (0) |
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343 | # define lockdep_init() do { } while (0) |
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344 | # define lockdep_info() do { } while (0) |
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345 | # define lockdep_init_map(lock, name, key, sub) \ |
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346 | do { (void)(name); (void)(key); } while (0) |
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347 | # define lockdep_set_class(lock, key) do { (void)(key); } while (0) |
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348 | # define lockdep_set_class_and_name(lock, key, name) \ |
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349 | do { (void)(key); (void)(name); } while (0) |
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350 | #define lockdep_set_class_and_subclass(lock, key, sub) \ |
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351 | do { (void)(key); } while (0) |
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352 | #define lockdep_set_subclass(lock, sub) do { } while (0) |
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353 | /* |
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354 | * We don't define lockdep_match_class() and lockdep_match_key() for !LOCKDEP |
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355 | * case since the result is not well defined and the caller should rather |
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356 | * #ifdef the call himself. |
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357 | */ |
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358 | |||
359 | # define INIT_LOCKDEP |
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360 | # define lockdep_reset() do { debug_locks = 1; } while (0) |
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361 | # define lockdep_free_key_range(start, size) do { } while (0) |
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362 | # define lockdep_sys_exit() do { } while (0) |
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363 | /* |
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364 | * The class key takes no space if lockdep is disabled: |
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365 | */ |
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366 | struct lock_class_key { }; |
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367 | |||
368 | #define lockdep_depth(tsk) (0) |
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369 | |||
370 | #define lockdep_assert_held(l) do { } while (0) |
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371 | |||
372 | #endif /* !LOCKDEP */ |
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373 | |||
374 | #ifdef CONFIG_LOCK_STAT |
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375 | |||
376 | extern void lock_contended(struct lockdep_map *lock, unsigned long ip); |
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377 | extern void lock_acquired(struct lockdep_map *lock, unsigned long ip); |
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378 | |||
379 | #define LOCK_CONTENDED(_lock, try, lock) \ |
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380 | do { \ |
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381 | if (!try(_lock)) { \ |
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382 | lock_contended(&(_lock)->dep_map, _RET_IP_); \ |
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383 | lock(_lock); \ |
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384 | } \ |
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385 | lock_acquired(&(_lock)->dep_map, _RET_IP_); \ |
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386 | } while (0) |
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387 | |||
388 | #else /* CONFIG_LOCK_STAT */ |
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389 | |||
390 | #define lock_contended(lockdep_map, ip) do {} while (0) |
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391 | #define lock_acquired(lockdep_map, ip) do {} while (0) |
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392 | |||
393 | #define LOCK_CONTENDED(_lock, try, lock) \ |
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394 | lock(_lock) |
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395 | |||
396 | #endif /* CONFIG_LOCK_STAT */ |
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397 | |||
398 | #ifdef CONFIG_LOCKDEP |
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399 | |||
400 | /* |
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401 | * On lockdep we dont want the hand-coded irq-enable of |
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402 | * _raw_*_lock_flags() code, because lockdep assumes |
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403 | * that interrupts are not re-enabled during lock-acquire: |
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404 | */ |
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405 | #define LOCK_CONTENDED_FLAGS(_lock, try, lock, lockfl, flags) \ |
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406 | LOCK_CONTENDED((_lock), (try), (lock)) |
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407 | |||
408 | #else /* CONFIG_LOCKDEP */ |
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409 | |||
410 | #define LOCK_CONTENDED_FLAGS(_lock, try, lock, lockfl, flags) \ |
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411 | lockfl((_lock), (flags)) |
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412 | |||
413 | #endif /* CONFIG_LOCKDEP */ |
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414 | |||
415 | #ifdef CONFIG_GENERIC_HARDIRQS |
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416 | extern void early_init_irq_lock_class(void); |
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417 | #else |
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418 | static inline void early_init_irq_lock_class(void) |
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419 | { |
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420 | } |
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421 | #endif |
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422 | |||
423 | #ifdef CONFIG_TRACE_IRQFLAGS |
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424 | extern void early_boot_irqs_off(void); |
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425 | extern void early_boot_irqs_on(void); |
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426 | extern void print_irqtrace_events(struct task_struct *curr); |
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427 | #else |
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428 | static inline void early_boot_irqs_off(void) |
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429 | { |
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430 | } |
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431 | static inline void early_boot_irqs_on(void) |
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432 | { |
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433 | } |
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434 | static inline void print_irqtrace_events(struct task_struct *curr) |
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435 | { |
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436 | } |
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437 | #endif |
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438 | |||
439 | /* |
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440 | * For trivial one-depth nesting of a lock-class, the following |
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441 | * global define can be used. (Subsystems with multiple levels |
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442 | * of nesting should define their own lock-nesting subclasses.) |
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443 | */ |
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444 | #define SINGLE_DEPTH_NESTING 1 |
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445 | |||
446 | /* |
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447 | * Map the dependency ops to NOP or to real lockdep ops, depending |
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448 | * on the per lock-class debug mode: |
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449 | */ |
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450 | |||
451 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
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452 | # ifdef CONFIG_PROVE_LOCKING |
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453 | # define spin_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, NULL, i) |
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454 | # define spin_acquire_nest(l, s, t, n, i) lock_acquire(l, s, t, 0, 2, n, i) |
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455 | # else |
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456 | # define spin_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, NULL, i) |
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457 | # define spin_acquire_nest(l, s, t, n, i) lock_acquire(l, s, t, 0, 1, NULL, i) |
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458 | # endif |
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459 | # define spin_release(l, n, i) lock_release(l, n, i) |
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460 | #else |
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461 | # define spin_acquire(l, s, t, i) do { } while (0) |
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462 | # define spin_release(l, n, i) do { } while (0) |
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463 | #endif |
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464 | |||
465 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
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466 | # ifdef CONFIG_PROVE_LOCKING |
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467 | # define rwlock_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, NULL, i) |
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468 | # define rwlock_acquire_read(l, s, t, i) lock_acquire(l, s, t, 2, 2, NULL, i) |
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469 | # else |
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470 | # define rwlock_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, NULL, i) |
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471 | # define rwlock_acquire_read(l, s, t, i) lock_acquire(l, s, t, 2, 1, NULL, i) |
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472 | # endif |
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473 | # define rwlock_release(l, n, i) lock_release(l, n, i) |
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474 | #else |
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475 | # define rwlock_acquire(l, s, t, i) do { } while (0) |
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476 | # define rwlock_acquire_read(l, s, t, i) do { } while (0) |
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477 | # define rwlock_release(l, n, i) do { } while (0) |
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478 | #endif |
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479 | |||
480 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
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481 | # ifdef CONFIG_PROVE_LOCKING |
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482 | # define mutex_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, NULL, i) |
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483 | # else |
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484 | # define mutex_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, NULL, i) |
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485 | # endif |
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486 | # define mutex_release(l, n, i) lock_release(l, n, i) |
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487 | #else |
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488 | # define mutex_acquire(l, s, t, i) do { } while (0) |
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489 | # define mutex_release(l, n, i) do { } while (0) |
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490 | #endif |
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491 | |||
492 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
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493 | # ifdef CONFIG_PROVE_LOCKING |
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494 | # define rwsem_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, NULL, i) |
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495 | # define rwsem_acquire_read(l, s, t, i) lock_acquire(l, s, t, 1, 2, NULL, i) |
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496 | # else |
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497 | # define rwsem_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, NULL, i) |
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498 | # define rwsem_acquire_read(l, s, t, i) lock_acquire(l, s, t, 1, 1, NULL, i) |
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499 | # endif |
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500 | # define rwsem_release(l, n, i) lock_release(l, n, i) |
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501 | #else |
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502 | # define rwsem_acquire(l, s, t, i) do { } while (0) |
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503 | # define rwsem_acquire_read(l, s, t, i) do { } while (0) |
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504 | # define rwsem_release(l, n, i) do { } while (0) |
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505 | #endif |
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506 | |||
507 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
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508 | # ifdef CONFIG_PROVE_LOCKING |
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509 | # define lock_map_acquire(l) lock_acquire(l, 0, 0, 0, 2, NULL, _THIS_IP_) |
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510 | # else |
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511 | # define lock_map_acquire(l) lock_acquire(l, 0, 0, 0, 1, NULL, _THIS_IP_) |
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512 | # endif |
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513 | # define lock_map_release(l) lock_release(l, 1, _THIS_IP_) |
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514 | #else |
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515 | # define lock_map_acquire(l) do { } while (0) |
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516 | # define lock_map_release(l) do { } while (0) |
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517 | #endif |
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518 | |||
519 | #ifdef CONFIG_PROVE_LOCKING |
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520 | # define might_lock(lock) \ |
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521 | do { \ |
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522 | typecheck(struct lockdep_map *, &(lock)->dep_map); \ |
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523 | lock_acquire(&(lock)->dep_map, 0, 0, 0, 2, NULL, _THIS_IP_); \ |
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524 | lock_release(&(lock)->dep_map, 0, _THIS_IP_); \ |
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525 | } while (0) |
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526 | # define might_lock_read(lock) \ |
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527 | do { \ |
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528 | typecheck(struct lockdep_map *, &(lock)->dep_map); \ |
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529 | lock_acquire(&(lock)->dep_map, 0, 0, 1, 2, NULL, _THIS_IP_); \ |
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530 | lock_release(&(lock)->dep_map, 0, _THIS_IP_); \ |
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531 | } while (0) |
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532 | #else |
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533 | # define might_lock(lock) do { } while (0) |
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534 | # define might_lock_read(lock) do { } while (0) |
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535 | #endif |
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536 | |||
537 | #endif /* __LINUX_LOCKDEP_H */><> |