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6c442127 | 1 | /* SPDX-License-Identifier: GPL-2.0+ */ |
9b1d82fa PM |
2 | /* |
3 | * Read-Copy Update mechanism for mutual exclusion, the Bloatwatch edition. | |
4 | * | |
9b1d82fa PM |
5 | * Copyright IBM Corporation, 2008 |
6 | * | |
6c442127 | 7 | * Author: Paul E. McKenney <paulmck@linux.ibm.com> |
9b1d82fa PM |
8 | * |
9 | * For detailed explanation of Read-Copy Update mechanism see - | |
4ce5b903 | 10 | * Documentation/RCU |
9b1d82fa | 11 | */ |
9b1d82fa PM |
12 | #ifndef __LINUX_TINY_H |
13 | #define __LINUX_TINY_H | |
14 | ||
24691069 | 15 | #include <asm/param.h> /* for HZ */ |
9b1d82fa | 16 | |
91a967fd PM |
17 | struct rcu_gp_oldstate { |
18 | unsigned long rgos_norm; | |
19 | }; | |
20 | ||
18538248 PM |
21 | // Maximum number of rcu_gp_oldstate values corresponding to |
22 | // not-yet-completed RCU grace periods. | |
23 | #define NUM_ACTIVE_RCU_POLL_FULL_OLDSTATE 2 | |
24 | ||
25 | /* | |
26 | * Are the two oldstate values the same? See the Tree RCU version for | |
27 | * docbook header. | |
28 | */ | |
29 | static inline bool same_state_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp1, | |
30 | struct rcu_gp_oldstate *rgosp2) | |
31 | { | |
32 | return rgosp1->rgos_norm == rgosp2->rgos_norm; | |
33 | } | |
34 | ||
0909fc2b | 35 | unsigned long get_state_synchronize_rcu(void); |
3fdefca9 PM |
36 | |
37 | static inline void get_state_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp) | |
38 | { | |
39 | rgosp->rgos_norm = get_state_synchronize_rcu(); | |
40 | } | |
41 | ||
0909fc2b | 42 | unsigned long start_poll_synchronize_rcu(void); |
76ea3641 PM |
43 | |
44 | static inline void start_poll_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp) | |
45 | { | |
46 | rgosp->rgos_norm = start_poll_synchronize_rcu(); | |
47 | } | |
48 | ||
0909fc2b | 49 | bool poll_state_synchronize_rcu(unsigned long oldstate); |
765a3f4f | 50 | |
91a967fd PM |
51 | static inline bool poll_state_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp) |
52 | { | |
53 | return poll_state_synchronize_rcu(rgosp->rgos_norm); | |
54 | } | |
55 | ||
765a3f4f PM |
56 | static inline void cond_synchronize_rcu(unsigned long oldstate) |
57 | { | |
58 | might_sleep(); | |
b6fe4917 PM |
59 | } |
60 | ||
61 | static inline void cond_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp) | |
62 | { | |
63 | cond_synchronize_rcu(rgosp->rgos_norm); | |
765a3f4f PM |
64 | } |
65 | ||
d96c52fe PM |
66 | static inline unsigned long start_poll_synchronize_rcu_expedited(void) |
67 | { | |
68 | return start_poll_synchronize_rcu(); | |
69 | } | |
70 | ||
6c502b14 PM |
71 | static inline void start_poll_synchronize_rcu_expedited_full(struct rcu_gp_oldstate *rgosp) |
72 | { | |
73 | rgosp->rgos_norm = start_poll_synchronize_rcu_expedited(); | |
74 | } | |
75 | ||
d96c52fe PM |
76 | static inline void cond_synchronize_rcu_expedited(unsigned long oldstate) |
77 | { | |
78 | cond_synchronize_rcu(oldstate); | |
79 | } | |
80 | ||
8df13f01 PM |
81 | static inline void cond_synchronize_rcu_expedited_full(struct rcu_gp_oldstate *rgosp) |
82 | { | |
83 | cond_synchronize_rcu_expedited(rgosp->rgos_norm); | |
84 | } | |
85 | ||
709fdce7 | 86 | extern void rcu_barrier(void); |
2c42818e | 87 | |
a57eb940 | 88 | static inline void synchronize_rcu_expedited(void) |
bf66f18e | 89 | { |
a8bb74ac | 90 | synchronize_rcu(); |
bf66f18e PM |
91 | } |
92 | ||
3042f83f URS |
93 | /* |
94 | * Add one more declaration of kvfree() here. It is | |
95 | * not so straight forward to just include <linux/mm.h> | |
96 | * where it is defined due to getting many compile | |
97 | * errors caused by that include. | |
98 | */ | |
99 | extern void kvfree(const void *addr); | |
100 | ||
800d6acf | 101 | static inline void __kvfree_call_rcu(struct rcu_head *head, rcu_callback_t func) |
bf66f18e | 102 | { |
3042f83f URS |
103 | if (head) { |
104 | call_rcu(head, func); | |
105 | return; | |
106 | } | |
107 | ||
108 | // kvfree_rcu(one_arg) call. | |
109 | might_sleep(); | |
110 | synchronize_rcu(); | |
111 | kvfree((void *) func); | |
9b1d82fa PM |
112 | } |
113 | ||
800d6acf JB |
114 | #ifdef CONFIG_KASAN_GENERIC |
115 | void kvfree_call_rcu(struct rcu_head *head, rcu_callback_t func); | |
116 | #else | |
117 | static inline void kvfree_call_rcu(struct rcu_head *head, rcu_callback_t func) | |
118 | { | |
119 | __kvfree_call_rcu(head, func); | |
120 | } | |
121 | #endif | |
122 | ||
709fdce7 | 123 | void rcu_qs(void); |
7b27d547 | 124 | |
d28139c4 | 125 | static inline void rcu_softirq_qs(void) |
486e2593 | 126 | { |
709fdce7 | 127 | rcu_qs(); |
486e2593 PM |
128 | } |
129 | ||
bcbfdd01 PM |
130 | #define rcu_note_context_switch(preempt) \ |
131 | do { \ | |
709fdce7 | 132 | rcu_qs(); \ |
43766c3e | 133 | rcu_tasks_qs(current, (preempt)); \ |
bcbfdd01 | 134 | } while (0) |
a57eb940 | 135 | |
29845399 | 136 | static inline int rcu_needs_cpu(void) |
5f192ab0 | 137 | { |
5f192ab0 PM |
138 | return 0; |
139 | } | |
140 | ||
29ce8310 GN |
141 | /* |
142 | * Take advantage of the fact that there is only one CPU, which | |
143 | * allows us to ignore virtualization-based context switches. | |
144 | */ | |
b5ad0d2e | 145 | static inline void rcu_virt_note_context_switch(void) { } |
71c40fd0 | 146 | static inline void rcu_cpu_stall_reset(void) { } |
1b27291b | 147 | static inline int rcu_jiffies_till_stall_check(void) { return 21 * HZ; } |
07325d4a | 148 | static inline void rcu_irq_exit_check_preempt(void) { } |
71c40fd0 | 149 | static inline void exit_rcu(void) { } |
3e310098 PM |
150 | static inline bool rcu_preempt_need_deferred_qs(struct task_struct *t) |
151 | { | |
152 | return false; | |
153 | } | |
154 | static inline void rcu_preempt_deferred_qs(struct task_struct *t) { } | |
584dc4ce | 155 | void rcu_scheduler_starting(void); |
d2b1654f | 156 | static inline void rcu_end_inkernel_boot(void) { } |
59ee0326 | 157 | static inline bool rcu_inkernel_boot_has_ended(void) { return true; } |
71c40fd0 | 158 | static inline bool rcu_is_watching(void) { return true; } |
79ba7ff5 | 159 | static inline void rcu_momentary_dyntick_idle(void) { } |
a35d1690 | 160 | static inline void kfree_rcu_scheduler_running(void) { } |
6be7436d | 161 | static inline bool rcu_gp_might_be_stalled(void) { return false; } |
5c173eb8 | 162 | |
71c40fd0 PM |
163 | /* Avoid RCU read-side critical sections leaking across. */ |
164 | static inline void rcu_all_qs(void) { barrier(); } | |
5cd37193 | 165 | |
4df83742 TG |
166 | /* RCUtree hotplug events */ |
167 | #define rcutree_prepare_cpu NULL | |
168 | #define rcutree_online_cpu NULL | |
169 | #define rcutree_offline_cpu NULL | |
170 | #define rcutree_dead_cpu NULL | |
171 | #define rcutree_dying_cpu NULL | |
f64c6013 | 172 | static inline void rcu_cpu_starting(unsigned int cpu) { } |
4df83742 | 173 | |
9b1d82fa | 174 | #endif /* __LINUX_RCUTINY_H */ |