1 /* SPDX-License-Identifier: GPL-2.0+ */ 1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /* 2 /*
3 * Read-Copy Update mechanism for mutual exclu 3 * Read-Copy Update mechanism for mutual exclusion, the Bloatwatch edition.
4 * 4 *
5 * Copyright IBM Corporation, 2008 5 * Copyright IBM Corporation, 2008
6 * 6 *
7 * Author: Paul E. McKenney <paulmck@linux.ibm 7 * Author: Paul E. McKenney <paulmck@linux.ibm.com>
8 * 8 *
9 * For detailed explanation of Read-Copy Updat 9 * For detailed explanation of Read-Copy Update mechanism see -
10 * Documentation/RCU 10 * Documentation/RCU
11 */ 11 */
12 #ifndef __LINUX_TINY_H 12 #ifndef __LINUX_TINY_H
13 #define __LINUX_TINY_H 13 #define __LINUX_TINY_H
14 14
15 #include <asm/param.h> /* for HZ */ 15 #include <asm/param.h> /* for HZ */
16 16
17 struct rcu_gp_oldstate { <<
18 unsigned long rgos_norm; <<
19 }; <<
20 <<
21 // Maximum number of rcu_gp_oldstate values co <<
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 <<
27 * docbook header. <<
28 */ <<
29 static inline bool same_state_synchronize_rcu_ <<
30 <<
31 { <<
32 return rgosp1->rgos_norm == rgosp2->rg <<
33 } <<
34 <<
35 unsigned long get_state_synchronize_rcu(void); 17 unsigned long get_state_synchronize_rcu(void);
36 <<
37 static inline void get_state_synchronize_rcu_f <<
38 { <<
39 rgosp->rgos_norm = get_state_synchroni <<
40 } <<
41 <<
42 unsigned long start_poll_synchronize_rcu(void) 18 unsigned long start_poll_synchronize_rcu(void);
43 <<
44 static inline void start_poll_synchronize_rcu_ <<
45 { <<
46 rgosp->rgos_norm = start_poll_synchron <<
47 } <<
48 <<
49 bool poll_state_synchronize_rcu(unsigned long 19 bool poll_state_synchronize_rcu(unsigned long oldstate);
50 20
51 static inline bool poll_state_synchronize_rcu_ <<
52 { <<
53 return poll_state_synchronize_rcu(rgos <<
54 } <<
55 <<
56 static inline void cond_synchronize_rcu(unsign 21 static inline void cond_synchronize_rcu(unsigned long oldstate)
57 { 22 {
58 might_sleep(); 23 might_sleep();
59 } 24 }
60 25
61 static inline void cond_synchronize_rcu_full(s <<
62 { <<
63 cond_synchronize_rcu(rgosp->rgos_norm) <<
64 } <<
65 <<
66 static inline unsigned long start_poll_synchro <<
67 { <<
68 return start_poll_synchronize_rcu(); <<
69 } <<
70 <<
71 static inline void start_poll_synchronize_rcu_ <<
72 { <<
73 rgosp->rgos_norm = start_poll_synchron <<
74 } <<
75 <<
76 static inline void cond_synchronize_rcu_expedi <<
77 { <<
78 cond_synchronize_rcu(oldstate); <<
79 } <<
80 <<
81 static inline void cond_synchronize_rcu_expedi <<
82 { <<
83 cond_synchronize_rcu_expedited(rgosp-> <<
84 } <<
85 <<
86 extern void rcu_barrier(void); 26 extern void rcu_barrier(void);
87 27
88 static inline void synchronize_rcu_expedited(v 28 static inline void synchronize_rcu_expedited(void)
89 { 29 {
90 synchronize_rcu(); 30 synchronize_rcu();
91 } 31 }
92 32
93 /* 33 /*
94 * Add one more declaration of kvfree() here. 34 * Add one more declaration of kvfree() here. It is
95 * not so straight forward to just include <li 35 * not so straight forward to just include <linux/mm.h>
96 * where it is defined due to getting many com 36 * where it is defined due to getting many compile
97 * errors caused by that include. 37 * errors caused by that include.
98 */ 38 */
99 extern void kvfree(const void *addr); 39 extern void kvfree(const void *addr);
100 40
101 static inline void __kvfree_call_rcu(struct rc !! 41 static inline void kvfree_call_rcu(struct rcu_head *head, rcu_callback_t func)
102 { 42 {
103 if (head) { 43 if (head) {
104 call_rcu(head, (rcu_callback_t !! 44 call_rcu(head, func);
105 return; 45 return;
106 } 46 }
107 47
108 // kvfree_rcu(one_arg) call. 48 // kvfree_rcu(one_arg) call.
109 might_sleep(); 49 might_sleep();
110 synchronize_rcu(); 50 synchronize_rcu();
111 kvfree(ptr); !! 51 kvfree((void *) func);
112 } <<
113 <<
114 static inline void kvfree_rcu_barrier(void) <<
115 { <<
116 rcu_barrier(); <<
117 } 52 }
118 53
119 #ifdef CONFIG_KASAN_GENERIC <<
120 void kvfree_call_rcu(struct rcu_head *head, vo <<
121 #else <<
122 static inline void kvfree_call_rcu(struct rcu_ <<
123 { <<
124 __kvfree_call_rcu(head, ptr); <<
125 } <<
126 #endif <<
127 <<
128 void rcu_qs(void); 54 void rcu_qs(void);
129 55
130 static inline void rcu_softirq_qs(void) 56 static inline void rcu_softirq_qs(void)
131 { 57 {
132 rcu_qs(); 58 rcu_qs();
133 } 59 }
134 60
135 #define rcu_note_context_switch(preempt) \ 61 #define rcu_note_context_switch(preempt) \
136 do { \ 62 do { \
137 rcu_qs(); \ 63 rcu_qs(); \
138 rcu_tasks_qs(current, (preempt 64 rcu_tasks_qs(current, (preempt)); \
139 } while (0) 65 } while (0)
140 66
141 static inline int rcu_needs_cpu(void) 67 static inline int rcu_needs_cpu(void)
142 { 68 {
143 return 0; 69 return 0;
144 } 70 }
145 71
146 static inline void rcu_request_urgent_qs_task( <<
147 <<
148 /* 72 /*
149 * Take advantage of the fact that there is on 73 * Take advantage of the fact that there is only one CPU, which
150 * allows us to ignore virtualization-based co 74 * allows us to ignore virtualization-based context switches.
151 */ 75 */
152 static inline void rcu_virt_note_context_switc !! 76 static inline void rcu_virt_note_context_switch(int cpu) { }
153 static inline void rcu_cpu_stall_reset(void) { 77 static inline void rcu_cpu_stall_reset(void) { }
154 static inline int rcu_jiffies_till_stall_check 78 static inline int rcu_jiffies_till_stall_check(void) { return 21 * HZ; }
>> 79 static inline void rcu_idle_enter(void) { }
>> 80 static inline void rcu_idle_exit(void) { }
>> 81 static inline void rcu_irq_enter(void) { }
>> 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) { }
155 static inline void rcu_irq_exit_check_preempt( 85 static inline void rcu_irq_exit_check_preempt(void) { }
>> 86 #define rcu_is_idle_cpu(cpu) \
>> 87 (is_idle_task(current) && !in_nmi() && !in_hardirq() && !in_serving_softirq())
156 static inline void exit_rcu(void) { } 88 static inline void exit_rcu(void) { }
157 static inline bool rcu_preempt_need_deferred_q 89 static inline bool rcu_preempt_need_deferred_qs(struct task_struct *t)
158 { 90 {
159 return false; 91 return false;
160 } 92 }
161 static inline void rcu_preempt_deferred_qs(str 93 static inline void rcu_preempt_deferred_qs(struct task_struct *t) { }
>> 94 #ifdef CONFIG_SRCU
162 void rcu_scheduler_starting(void); 95 void rcu_scheduler_starting(void);
>> 96 #else /* #ifndef CONFIG_SRCU */
>> 97 static inline void rcu_scheduler_starting(void) { }
>> 98 #endif /* #else #ifndef CONFIG_SRCU */
163 static inline void rcu_end_inkernel_boot(void) 99 static inline void rcu_end_inkernel_boot(void) { }
164 static inline bool rcu_inkernel_boot_has_ended 100 static inline bool rcu_inkernel_boot_has_ended(void) { return true; }
165 static inline bool rcu_is_watching(void) { ret 101 static inline bool rcu_is_watching(void) { return true; }
166 static inline void rcu_momentary_eqs(void) { } !! 102 static inline void rcu_momentary_dyntick_idle(void) { }
167 static inline void kfree_rcu_scheduler_running 103 static inline void kfree_rcu_scheduler_running(void) { }
168 static inline bool rcu_gp_might_be_stalled(voi 104 static inline bool rcu_gp_might_be_stalled(void) { return false; }
169 105
170 /* Avoid RCU read-side critical sections leaki 106 /* Avoid RCU read-side critical sections leaking across. */
171 static inline void rcu_all_qs(void) { barrier( 107 static inline void rcu_all_qs(void) { barrier(); }
172 108
173 /* RCUtree hotplug events */ 109 /* RCUtree hotplug events */
174 #define rcutree_prepare_cpu NULL 110 #define rcutree_prepare_cpu NULL
175 #define rcutree_online_cpu NULL 111 #define rcutree_online_cpu NULL
176 #define rcutree_offline_cpu NULL 112 #define rcutree_offline_cpu NULL
177 #define rcutree_dead_cpu NULL 113 #define rcutree_dead_cpu NULL
178 #define rcutree_dying_cpu NULL 114 #define rcutree_dying_cpu NULL
179 static inline void rcutree_report_cpu_starting !! 115 static inline void rcu_cpu_starting(unsigned int cpu) { }
180 116
181 #endif /* __LINUX_RCUTINY_H */ 117 #endif /* __LINUX_RCUTINY_H */
182 118
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