/usr/src/lttng-modules-2.7.1/wrapper/rcu.h is in lttng-modules-dkms 2.7.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 | #ifndef _LTTNG_WRAPPER_RCU_H
#define _LTTNG_WRAPPER_RCU_H
/*
* wrapper/rcu.h
*
* wrapper around linux/rcupdate.h and linux/rculist.h.
*
* Copyright (C) 2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; only
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/version.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
#include "list.h"
#ifndef rcu_dereference_raw_notrace
#define rcu_dereference_raw_notrace(p) rcu_dereference_raw(p)
#endif
#define lttng_rcu_dereference(p) rcu_dereference_raw_notrace(p)
/**
* lttng_list_entry_rcu - get the struct for this entry
* @ptr: the &struct list_head pointer.
* @type: the type of the struct this is embedded in.
* @member: the name of the list_head within the struct.
*
* This primitive may safely run concurrently with the _rcu list-mutation
* primitives such as list_add_rcu() as long as it's guarded by
* rcu_read_lock_sched().
* Can be used while tracing RCU.
*/
#define lttng_list_entry_rcu(ptr, type, member) \
({ \
typeof(*ptr) __rcu *__ptr = (typeof(*ptr) __rcu __force *)ptr; \
container_of((typeof(ptr))lttng_rcu_dereference(__ptr), type, member); \
})
/**
* lttng_list_for_each_entry_rcu - iterate over rcu list of given type
* @pos: the type * to use as a loop cursor.
* @head: the head for your list.
* @member: the name of the list_head within the struct.
*
* This list-traversal primitive may safely run concurrently with
* the _rcu list-mutation primitives such as list_add_rcu()
* as long as the traversal is guarded by rcu_read_lock_sched().
* Can be used while tracing RCU.
*/
#define lttng_list_for_each_entry_rcu(pos, head, member) \
for (pos = lttng_list_entry_rcu((head)->next, typeof(*pos), member); \
&pos->member != (head); \
pos = lttng_list_entry_rcu(pos->member.next, typeof(*pos), member))
/**
* lttng_hlist_for_each_entry_rcu - iterate over rcu list of given type (for tracing)
* @pos: the type * to use as a loop cursor.
* @head: the head for your list.
* @member: the name of the hlist_node within the struct.
*
* This list-traversal primitive may safely run concurrently with
* the _rcu list-mutation primitives such as hlist_add_head_rcu()
* as long as the traversal is guarded by rcu_read_lock().
*
* This is the same as hlist_for_each_entry_rcu() except that it does
* not do any RCU debugging or tracing.
*/
#define lttng_hlist_for_each_entry_rcu(pos, head, member) \
for (pos = lttng_hlist_entry_safe (lttng_rcu_dereference(lttng_hlist_first_rcu(head)), \
typeof(*(pos)), member); \
pos; \
pos = lttng_hlist_entry_safe(lttng_rcu_dereference(lttng_hlist_next_rcu( \
&(pos)->member)), typeof(*(pos)), member))
#endif /* _LTTNG_WRAPPER_RCU_H */
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