mirror of
https://github.com/opnsense/src.git
synced 2026-03-17 16:14:58 -04:00
8341284368
Update rcu_dereference_{check,protected}() to call the check and log
once if it fails and if the RCU debug sysctl is turned on.
Also add proper checks for conditions passed in to these functions.
For that implement linux_rcu_read_lock_held() (lots of help from wulf).
(While here also remove extraneous extern for function prototypes).
Update lockdep_is_held() to always be an inline function with argument
annotation so that we do no longer have unused variables
in callers which only call lockdep_is_held().
Sponsored by: The FreeBSD Foundation
Reviewed by: wulf
Differential Revision: https://reviews.freebsd.org/D46842
(cherry picked from commit 5c92f84bb607c692ce4fa762a7a3c4b86a2fa281)
165 lines
5 KiB
C
165 lines
5 KiB
C
/*-
|
|
* Copyright (c) 2016-2017 Mellanox Technologies, Ltd.
|
|
* All rights reserved.
|
|
* Copyright (c) 2024 The FreeBSD Foundation
|
|
*
|
|
* Portions of this software were developed by Björn Zeeb
|
|
* under sponsorship from the FreeBSD Foundation.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice unmodified, this list of conditions, and the following
|
|
* disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
#ifndef _LINUXKPI_LINUX_RCUPDATE_H_
|
|
#define _LINUXKPI_LINUX_RCUPDATE_H_
|
|
|
|
#include <sys/cdefs.h>
|
|
|
|
#include <linux/compiler.h>
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
|
|
#include <machine/atomic.h>
|
|
|
|
extern int linuxkpi_rcu_debug;
|
|
#define RCU_WARN_ONCE(c, ...) do { \
|
|
if (unlikely(linuxkpi_rcu_debug > 0)) \
|
|
WARN_ONCE((c), ##__VA_ARGS__); \
|
|
} while(0)
|
|
|
|
#define LINUX_KFREE_RCU_OFFSET_MAX 4096 /* exclusive */
|
|
|
|
/* BSD specific defines */
|
|
#define RCU_TYPE_REGULAR 0
|
|
#define RCU_TYPE_SLEEPABLE 1
|
|
#define RCU_TYPE_MAX 2
|
|
|
|
#define RCU_INITIALIZER(v) \
|
|
((__typeof(*(v)) *)(v))
|
|
|
|
#define RCU_INIT_POINTER(p, v) do { \
|
|
(p) = (v); \
|
|
} while (0)
|
|
|
|
#define call_rcu(ptr, func) do { \
|
|
linux_call_rcu(RCU_TYPE_REGULAR, ptr, func); \
|
|
} while (0)
|
|
|
|
#define rcu_barrier(void) do { \
|
|
linux_rcu_barrier(RCU_TYPE_REGULAR); \
|
|
} while (0)
|
|
|
|
#define rcu_read_lock(void) do { \
|
|
linux_rcu_read_lock(RCU_TYPE_REGULAR); \
|
|
} while (0)
|
|
|
|
#define rcu_read_unlock(void) do { \
|
|
linux_rcu_read_unlock(RCU_TYPE_REGULAR);\
|
|
} while (0)
|
|
|
|
#define rcu_read_lock_held(void) \
|
|
linux_rcu_read_lock_held(RCU_TYPE_REGULAR)
|
|
|
|
#define synchronize_rcu(void) do { \
|
|
linux_synchronize_rcu(RCU_TYPE_REGULAR); \
|
|
} while (0)
|
|
|
|
#define synchronize_rcu_expedited(void) do { \
|
|
linux_synchronize_rcu(RCU_TYPE_REGULAR); \
|
|
} while (0)
|
|
|
|
#define kfree_rcu(ptr, rcu_head) do { \
|
|
CTASSERT(offsetof(__typeof(*(ptr)), rcu_head) < \
|
|
LINUX_KFREE_RCU_OFFSET_MAX); \
|
|
call_rcu(&(ptr)->rcu_head, (rcu_callback_t)(uintptr_t) \
|
|
offsetof(__typeof(*(ptr)), rcu_head)); \
|
|
} while (0)
|
|
|
|
#define rcu_access_pointer(p) \
|
|
((__typeof(*p) *)READ_ONCE(p))
|
|
|
|
#define rcu_dereference(p) \
|
|
((__typeof(*p) *)READ_ONCE(p))
|
|
|
|
#define __rcu_var_name(n, f, l) \
|
|
__CONCAT(__CONCAT(__CONCAT(rcu_, n), _), __COUNTER__)
|
|
|
|
#define __rcu_dereference_protected(p, c, n) \
|
|
({ \
|
|
RCU_WARN_ONCE(!(c), "%s:%d: condition for %s failed\n", \
|
|
__func__, __LINE__, __XSTRING(n)); \
|
|
rcu_dereference(p); \
|
|
})
|
|
|
|
#define rcu_dereference_protected(p, c) \
|
|
__rcu_dereference_protected((p), (c), \
|
|
__rcu_var_name(protected, __func__, __LINE__))
|
|
|
|
#define __rcu_dereference_check(p, c, n) \
|
|
({ \
|
|
__typeof(*p) *n = rcu_dereference(p); \
|
|
RCU_WARN_ONCE(!(c), "%s:%d: condition for %s failed\n", \
|
|
__func__, __LINE__, __XSTRING(n)); \
|
|
n; \
|
|
})
|
|
|
|
#define rcu_dereference_check(p, c) \
|
|
__rcu_dereference_check((p), (c) || rcu_read_lock_held(), \
|
|
__rcu_var_name(check, __func__, __LINE__))
|
|
|
|
#define rcu_dereference_raw(p) \
|
|
((__typeof(*p) *)READ_ONCE(p))
|
|
|
|
#define rcu_pointer_handoff(p) (p)
|
|
|
|
#define rcu_assign_pointer(p, v) do { \
|
|
atomic_store_rel_ptr((volatile uintptr_t *)&(p), \
|
|
(uintptr_t)(v)); \
|
|
} while (0)
|
|
|
|
#define rcu_replace_pointer(rcu, ptr, c) \
|
|
({ \
|
|
typeof(ptr) __tmp = rcu_dereference_protected(rcu, c); \
|
|
rcu_assign_pointer(rcu, ptr); \
|
|
__tmp; \
|
|
})
|
|
|
|
#define rcu_swap_protected(rcu, ptr, c) do { \
|
|
typeof(ptr) p = rcu_dereference_protected(rcu, c); \
|
|
rcu_assign_pointer(rcu, ptr); \
|
|
(ptr) = p; \
|
|
} while (0)
|
|
|
|
/* prototypes */
|
|
|
|
void linux_call_rcu(unsigned type, struct rcu_head *ptr, rcu_callback_t func);
|
|
void linux_rcu_barrier(unsigned type);
|
|
void linux_rcu_read_lock(unsigned type);
|
|
void linux_rcu_read_unlock(unsigned type);
|
|
bool linux_rcu_read_lock_held(unsigned);
|
|
void linux_synchronize_rcu(unsigned type);
|
|
|
|
/* Empty implementation for !DEBUG */
|
|
#define init_rcu_head(...)
|
|
#define destroy_rcu_head(...)
|
|
#define init_rcu_head_on_stack(...)
|
|
#define destroy_rcu_head_on_stack(...)
|
|
|
|
#endif /* _LINUXKPI_LINUX_RCUPDATE_H_ */
|