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