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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - include/linux/rcupreempt.h
2 * Read-Copy Update mechanism for mutual exclusion (RT implementation)
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.
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.
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.
18 * Copyright (C) IBM Corporation, 2006
20 * Author: Paul McKenney <paulmck@us.ibm.com>
22 * Based on the original work by Paul McKenney <paul.mckenney@us.ibm.com>
23 * and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen.
25 * http://www.rdrop.com/users/paulmck/paper/rclockpdcsproof.pdf
26 * http://lse.sourceforge.net/locking/rclock_OLS.2001.05.01c.sc.pdf (OLS2001)
28 * For detailed explanation of Read-Copy Update mechanism see -
33 #ifndef __LINUX_RCUPREEMPT_H
34 #define __LINUX_RCUPREEMPT_H
38 #include <linux/cache.h>
39 #include <linux/spinlock.h>
40 #include <linux/threads.h>
41 #include <linux/percpu.h>
42 #include <linux/cpumask.h>
43 #include <linux/seqlock.h>
45 #define rcu_qsctr_inc(cpu)
46 #define rcu_bh_qsctr_inc(cpu)
47 #define call_rcu_bh(head, rcu) call_rcu(head, rcu)
49 extern void __rcu_read_lock(void);
50 extern void __rcu_read_unlock(void);
51 extern int rcu_pending(int cpu
);
52 extern int rcu_needs_cpu(int cpu
);
54 #define __rcu_read_lock_bh() { rcu_read_lock(); local_bh_disable(); }
55 #define __rcu_read_unlock_bh() { local_bh_enable(); rcu_read_unlock(); }
57 extern void __synchronize_sched(void);
59 extern void __rcu_init(void);
60 extern void rcu_check_callbacks(int cpu
, int user
);
61 extern void rcu_restart_cpu(int cpu
);
62 extern long rcu_batches_completed(void);
65 * Return the number of RCU batches processed thus far. Useful for debug
66 * and statistic. The _bh variant is identifcal to straight RCU
68 static inline long rcu_batches_completed_bh(void)
70 return rcu_batches_completed();
73 #ifdef CONFIG_RCU_TRACE
74 struct rcupreempt_trace
;
75 extern long *rcupreempt_flipctr(int cpu
);
76 extern long rcupreempt_data_completed(void);
77 extern int rcupreempt_flip_flag(int cpu
);
78 extern int rcupreempt_mb_flag(int cpu
);
79 extern char *rcupreempt_try_flip_state_name(void);
80 extern struct rcupreempt_trace
*rcupreempt_trace_cpu(int cpu
);
83 struct softirq_action
;
85 #endif /* __KERNEL__ */
86 #endif /* __LINUX_RCUPREEMPT_H */