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 <linux/ktime.h>
16 16
17 struct rcu_gp_oldstate { !! 17 /* Never flag non-existent other CPUs! */
18 unsigned long rgos_norm; !! 18 static inline bool rcu_eqs_special_set(int cpu) { return false; }
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 19
25 /* !! 20 static inline unsigned long get_state_synchronize_rcu(void)
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); <<
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) <<
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 <<
50 <<
51 static inline bool poll_state_synchronize_rcu_ <<
52 { 21 {
53 return poll_state_synchronize_rcu(rgos !! 22 return 0;
54 } 23 }
55 24
56 static inline void cond_synchronize_rcu(unsign 25 static inline void cond_synchronize_rcu(unsigned long oldstate)
57 { 26 {
58 might_sleep(); 27 might_sleep();
59 } 28 }
60 29
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); 30 extern void rcu_barrier(void);
87 31
88 static inline void synchronize_rcu_expedited(v 32 static inline void synchronize_rcu_expedited(void)
89 { 33 {
90 synchronize_rcu(); 34 synchronize_rcu();
91 } 35 }
92 36
93 /* !! 37 static inline void kfree_call_rcu(struct rcu_head *head, rcu_callback_t func)
94 * Add one more declaration of kvfree() here. <<
95 * not so straight forward to just include <li <<
96 * where it is defined due to getting many com <<
97 * errors caused by that include. <<
98 */ <<
99 extern void kvfree(const void *addr); <<
100 <<
101 static inline void __kvfree_call_rcu(struct rc <<
102 { 38 {
103 if (head) { !! 39 call_rcu(head, func);
104 call_rcu(head, (rcu_callback_t <<
105 return; <<
106 } <<
107 <<
108 // kvfree_rcu(one_arg) call. <<
109 might_sleep(); <<
110 synchronize_rcu(); <<
111 kvfree(ptr); <<
112 } <<
113 <<
114 static inline void kvfree_rcu_barrier(void) <<
115 { <<
116 rcu_barrier(); <<
117 } 40 }
118 41
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); 42 void rcu_qs(void);
129 43
130 static inline void rcu_softirq_qs(void) 44 static inline void rcu_softirq_qs(void)
131 { 45 {
132 rcu_qs(); 46 rcu_qs();
133 } 47 }
134 48
135 #define rcu_note_context_switch(preempt) \ 49 #define rcu_note_context_switch(preempt) \
136 do { \ 50 do { \
137 rcu_qs(); \ 51 rcu_qs(); \
138 rcu_tasks_qs(current, (preempt !! 52 rcu_tasks_qs(current); \
139 } while (0) 53 } while (0)
140 54
141 static inline int rcu_needs_cpu(void) !! 55 static inline int rcu_needs_cpu(u64 basemono, u64 *nextevt)
142 { 56 {
>> 57 *nextevt = KTIME_MAX;
143 return 0; 58 return 0;
144 } 59 }
145 60
146 static inline void rcu_request_urgent_qs_task( <<
147 <<
148 /* 61 /*
149 * Take advantage of the fact that there is on 62 * Take advantage of the fact that there is only one CPU, which
150 * allows us to ignore virtualization-based co 63 * allows us to ignore virtualization-based context switches.
151 */ 64 */
152 static inline void rcu_virt_note_context_switc !! 65 static inline void rcu_virt_note_context_switch(int cpu) { }
153 static inline void rcu_cpu_stall_reset(void) { 66 static inline void rcu_cpu_stall_reset(void) { }
154 static inline int rcu_jiffies_till_stall_check 67 static inline int rcu_jiffies_till_stall_check(void) { return 21 * HZ; }
155 static inline void rcu_irq_exit_check_preempt( !! 68 static inline void rcu_idle_enter(void) { }
>> 69 static inline void rcu_idle_exit(void) { }
>> 70 static inline void rcu_irq_enter(void) { }
>> 71 static inline void rcu_irq_exit_irqson(void) { }
>> 72 static inline void rcu_irq_enter_irqson(void) { }
>> 73 static inline void rcu_irq_exit(void) { }
156 static inline void exit_rcu(void) { } 74 static inline void exit_rcu(void) { }
157 static inline bool rcu_preempt_need_deferred_q 75 static inline bool rcu_preempt_need_deferred_qs(struct task_struct *t)
158 { 76 {
159 return false; 77 return false;
160 } 78 }
161 static inline void rcu_preempt_deferred_qs(str 79 static inline void rcu_preempt_deferred_qs(struct task_struct *t) { }
>> 80 #ifdef CONFIG_SRCU
162 void rcu_scheduler_starting(void); 81 void rcu_scheduler_starting(void);
>> 82 #else /* #ifndef CONFIG_SRCU */
>> 83 static inline void rcu_scheduler_starting(void) { }
>> 84 #endif /* #else #ifndef CONFIG_SRCU */
163 static inline void rcu_end_inkernel_boot(void) 85 static inline void rcu_end_inkernel_boot(void) { }
164 static inline bool rcu_inkernel_boot_has_ended <<
165 static inline bool rcu_is_watching(void) { ret 86 static inline bool rcu_is_watching(void) { return true; }
166 static inline void rcu_momentary_eqs(void) { } <<
167 static inline void kfree_rcu_scheduler_running <<
168 static inline bool rcu_gp_might_be_stalled(voi <<
169 87
170 /* Avoid RCU read-side critical sections leaki 88 /* Avoid RCU read-side critical sections leaking across. */
171 static inline void rcu_all_qs(void) { barrier( 89 static inline void rcu_all_qs(void) { barrier(); }
172 90
173 /* RCUtree hotplug events */ 91 /* RCUtree hotplug events */
174 #define rcutree_prepare_cpu NULL 92 #define rcutree_prepare_cpu NULL
175 #define rcutree_online_cpu NULL 93 #define rcutree_online_cpu NULL
176 #define rcutree_offline_cpu NULL 94 #define rcutree_offline_cpu NULL
177 #define rcutree_dead_cpu NULL 95 #define rcutree_dead_cpu NULL
178 #define rcutree_dying_cpu NULL 96 #define rcutree_dying_cpu NULL
179 static inline void rcutree_report_cpu_starting !! 97 static inline void rcu_cpu_starting(unsigned int cpu) { }
180 98
181 #endif /* __LINUX_RCUTINY_H */ 99 #endif /* __LINUX_RCUTINY_H */
182 100
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