Commit | Line | Data |
---|---|---|
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 | |
0909fc2b PM |
17 | unsigned long get_state_synchronize_rcu(void); |
18 | unsigned long start_poll_synchronize_rcu(void); | |
19 | bool poll_state_synchronize_rcu(unsigned long oldstate); | |
765a3f4f PM |
20 | |
21 | static inline void cond_synchronize_rcu(unsigned long oldstate) | |
22 | { | |
23 | might_sleep(); | |
24 | } | |
25 | ||
709fdce7 | 26 | extern void rcu_barrier(void); |
2c42818e | 27 | |
a57eb940 | 28 | static inline void synchronize_rcu_expedited(void) |
bf66f18e | 29 | { |
a8bb74ac | 30 | synchronize_rcu(); |
bf66f18e PM |
31 | } |
32 | ||
3042f83f URS |
33 | /* |
34 | * Add one more declaration of kvfree() here. It is | |
35 | * not so straight forward to just include <linux/mm.h> | |
36 | * where it is defined due to getting many compile | |
37 | * errors caused by that include. | |
38 | */ | |
39 | extern void kvfree(const void *addr); | |
40 | ||
c408b215 | 41 | static inline void kvfree_call_rcu(struct rcu_head *head, rcu_callback_t func) |
bf66f18e | 42 | { |
3042f83f URS |
43 | if (head) { |
44 | call_rcu(head, func); | |
45 | return; | |
46 | } | |
47 | ||
48 | // kvfree_rcu(one_arg) call. | |
49 | might_sleep(); | |
50 | synchronize_rcu(); | |
51 | kvfree((void *) func); | |
9b1d82fa PM |
52 | } |
53 | ||
709fdce7 | 54 | void rcu_qs(void); |
7b27d547 | 55 | |
d28139c4 | 56 | static inline void rcu_softirq_qs(void) |
486e2593 | 57 | { |
709fdce7 | 58 | rcu_qs(); |
486e2593 PM |
59 | } |
60 | ||
bcbfdd01 PM |
61 | #define rcu_note_context_switch(preempt) \ |
62 | do { \ | |
709fdce7 | 63 | rcu_qs(); \ |
43766c3e | 64 | rcu_tasks_qs(current, (preempt)); \ |
bcbfdd01 | 65 | } while (0) |
a57eb940 | 66 | |
29845399 | 67 | static inline int rcu_needs_cpu(void) |
5f192ab0 | 68 | { |
5f192ab0 PM |
69 | return 0; |
70 | } | |
71 | ||
29ce8310 GN |
72 | /* |
73 | * Take advantage of the fact that there is only one CPU, which | |
74 | * allows us to ignore virtualization-based context switches. | |
75 | */ | |
71c40fd0 PM |
76 | static inline void rcu_virt_note_context_switch(int cpu) { } |
77 | static inline void rcu_cpu_stall_reset(void) { } | |
1b27291b | 78 | static inline int rcu_jiffies_till_stall_check(void) { return 21 * HZ; } |
71c40fd0 PM |
79 | static inline void rcu_idle_enter(void) { } |
80 | static inline void rcu_idle_exit(void) { } | |
81 | static inline void rcu_irq_enter(void) { } | |
71c40fd0 PM |
82 | static inline void rcu_irq_exit_irqson(void) { } |
83 | static inline void rcu_irq_enter_irqson(void) { } | |
84 | static inline void rcu_irq_exit(void) { } | |
07325d4a | 85 | static inline void rcu_irq_exit_check_preempt(void) { } |
3fcd6a23 | 86 | #define rcu_is_idle_cpu(cpu) \ |
2407a64f | 87 | (is_idle_task(current) && !in_nmi() && !in_hardirq() && !in_serving_softirq()) |
71c40fd0 | 88 | static inline void exit_rcu(void) { } |
3e310098 PM |
89 | static inline bool rcu_preempt_need_deferred_qs(struct task_struct *t) |
90 | { | |
91 | return false; | |
92 | } | |
93 | static inline void rcu_preempt_deferred_qs(struct task_struct *t) { } | |
825c5bd2 | 94 | #ifdef CONFIG_SRCU |
584dc4ce | 95 | void rcu_scheduler_starting(void); |
825c5bd2 | 96 | #else /* #ifndef CONFIG_SRCU */ |
71c40fd0 | 97 | static inline void rcu_scheduler_starting(void) { } |
825c5bd2 | 98 | #endif /* #else #ifndef CONFIG_SRCU */ |
d2b1654f | 99 | static inline void rcu_end_inkernel_boot(void) { } |
59ee0326 | 100 | static inline bool rcu_inkernel_boot_has_ended(void) { return true; } |
71c40fd0 | 101 | static inline bool rcu_is_watching(void) { return true; } |
79ba7ff5 | 102 | static inline void rcu_momentary_dyntick_idle(void) { } |
a35d1690 | 103 | static inline void kfree_rcu_scheduler_running(void) { } |
6be7436d | 104 | static inline bool rcu_gp_might_be_stalled(void) { return false; } |
5c173eb8 | 105 | |
71c40fd0 PM |
106 | /* Avoid RCU read-side critical sections leaking across. */ |
107 | static inline void rcu_all_qs(void) { barrier(); } | |
5cd37193 | 108 | |
4df83742 TG |
109 | /* RCUtree hotplug events */ |
110 | #define rcutree_prepare_cpu NULL | |
111 | #define rcutree_online_cpu NULL | |
112 | #define rcutree_offline_cpu NULL | |
113 | #define rcutree_dead_cpu NULL | |
114 | #define rcutree_dying_cpu NULL | |
f64c6013 | 115 | static inline void rcu_cpu_starting(unsigned int cpu) { } |
4df83742 | 116 | |
9b1d82fa | 117 | #endif /* __LINUX_RCUTINY_H */ |