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Source at commit cdde9cf73945d547acd3e96f9508c79e84ad0bf1 created 12 years 9 months ago. By Maarten ter Huurne, MMC: JZ4740: Added support for CPU frequency changing | |
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1 | /* |
2 | * Read-Copy Update definitions shared among RCU implementations. |
3 | * |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License as published by |
6 | * the Free Software Foundation; either version 2 of the License, or |
7 | * (at your option) any later version. |
8 | * |
9 | * This program is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
12 | * GNU General Public License for more details. |
13 | * |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write to the Free Software |
16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
17 | * |
18 | * Copyright IBM Corporation, 2011 |
19 | * |
20 | * Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
21 | */ |
22 | |
23 | #ifndef __LINUX_RCU_H |
24 | #define __LINUX_RCU_H |
25 | |
26 | #ifdef CONFIG_RCU_TRACE |
27 | #define RCU_TRACE(stmt) stmt |
28 | #else /* #ifdef CONFIG_RCU_TRACE */ |
29 | #define RCU_TRACE(stmt) |
30 | #endif /* #else #ifdef CONFIG_RCU_TRACE */ |
31 | |
32 | /* |
33 | * Process-level increment to ->dynticks_nesting field. This allows for |
34 | * architectures that use half-interrupts and half-exceptions from |
35 | * process context. |
36 | * |
37 | * DYNTICK_TASK_NEST_MASK defines a field of width DYNTICK_TASK_NEST_WIDTH |
38 | * that counts the number of process-based reasons why RCU cannot |
39 | * consider the corresponding CPU to be idle, and DYNTICK_TASK_NEST_VALUE |
40 | * is the value used to increment or decrement this field. |
41 | * |
42 | * The rest of the bits could in principle be used to count interrupts, |
43 | * but this would mean that a negative-one value in the interrupt |
44 | * field could incorrectly zero out the DYNTICK_TASK_NEST_MASK field. |
45 | * We therefore provide a two-bit guard field defined by DYNTICK_TASK_MASK |
46 | * that is set to DYNTICK_TASK_FLAG upon initial exit from idle. |
47 | * The DYNTICK_TASK_EXIT_IDLE value is thus the combined value used upon |
48 | * initial exit from idle. |
49 | */ |
50 | #define DYNTICK_TASK_NEST_WIDTH 7 |
51 | #define DYNTICK_TASK_NEST_VALUE ((LLONG_MAX >> DYNTICK_TASK_NEST_WIDTH) + 1) |
52 | #define DYNTICK_TASK_NEST_MASK (LLONG_MAX - DYNTICK_TASK_NEST_VALUE + 1) |
53 | #define DYNTICK_TASK_FLAG ((DYNTICK_TASK_NEST_VALUE / 8) * 2) |
54 | #define DYNTICK_TASK_MASK ((DYNTICK_TASK_NEST_VALUE / 8) * 3) |
55 | #define DYNTICK_TASK_EXIT_IDLE (DYNTICK_TASK_NEST_VALUE + \ |
56 | DYNTICK_TASK_FLAG) |
57 | |
58 | /* |
59 | * debug_rcu_head_queue()/debug_rcu_head_unqueue() are used internally |
60 | * by call_rcu() and rcu callback execution, and are therefore not part of the |
61 | * RCU API. Leaving in rcupdate.h because they are used by all RCU flavors. |
62 | */ |
63 | |
64 | #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD |
65 | # define STATE_RCU_HEAD_READY 0 |
66 | # define STATE_RCU_HEAD_QUEUED 1 |
67 | |
68 | extern struct debug_obj_descr rcuhead_debug_descr; |
69 | |
70 | static inline void debug_rcu_head_queue(struct rcu_head *head) |
71 | { |
72 | debug_object_activate(head, &rcuhead_debug_descr); |
73 | debug_object_active_state(head, &rcuhead_debug_descr, |
74 | STATE_RCU_HEAD_READY, |
75 | STATE_RCU_HEAD_QUEUED); |
76 | } |
77 | |
78 | static inline void debug_rcu_head_unqueue(struct rcu_head *head) |
79 | { |
80 | debug_object_active_state(head, &rcuhead_debug_descr, |
81 | STATE_RCU_HEAD_QUEUED, |
82 | STATE_RCU_HEAD_READY); |
83 | debug_object_deactivate(head, &rcuhead_debug_descr); |
84 | } |
85 | #else /* !CONFIG_DEBUG_OBJECTS_RCU_HEAD */ |
86 | static inline void debug_rcu_head_queue(struct rcu_head *head) |
87 | { |
88 | } |
89 | |
90 | static inline void debug_rcu_head_unqueue(struct rcu_head *head) |
91 | { |
92 | } |
93 | #endif /* #else !CONFIG_DEBUG_OBJECTS_RCU_HEAD */ |
94 | |
95 | extern void kfree(const void *); |
96 | |
97 | static inline bool __rcu_reclaim(char *rn, struct rcu_head *head) |
98 | { |
99 | unsigned long offset = (unsigned long)head->func; |
100 | |
101 | if (__is_kfree_rcu_offset(offset)) { |
102 | RCU_TRACE(trace_rcu_invoke_kfree_callback(rn, head, offset)); |
103 | kfree((void *)head - offset); |
104 | return 1; |
105 | } else { |
106 | RCU_TRACE(trace_rcu_invoke_callback(rn, head)); |
107 | head->func(head); |
108 | return 0; |
109 | } |
110 | } |
111 | |
112 | #endif /* __LINUX_RCU_H */ |
113 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9