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-rw-r--r--include/linux/rcupdate.h91
1 files changed, 13 insertions, 78 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 4db8bcacc51a..6cdb1db776cf 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -1,25 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Read-Copy Update mechanism for mutual exclusion
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, you can access it online at
- * http://www.gnu.org/licenses/gpl-2.0.html.
- *
* Copyright IBM Corporation, 2001
*
* Author: Dipankar Sarma <dipankar@in.ibm.com>
*
- * Based on the original work by Paul McKenney <paulmck@us.ibm.com>
+ * Based on the original work by Paul McKenney <paulmck@vnet.ibm.com>
* and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen.
* Papers:
* http://www.rdrop.com/users/paulmck/paper/rclockpdcsproof.pdf
@@ -89,7 +76,7 @@ static inline int rcu_preempt_depth(void)
/* Internal to kernel */
void rcu_init(void);
extern int rcu_scheduler_active __read_mostly;
-void rcu_check_callbacks(int user);
+void rcu_sched_clock_irq(int user);
void rcu_report_dead(unsigned int cpu);
void rcutree_migrate_callbacks(int cpu);
@@ -309,16 +296,16 @@ static inline void rcu_preempt_sleep_check(void) { }
*/
#ifdef __CHECKER__
-#define rcu_dereference_sparse(p, space) \
+#define rcu_check_sparse(p, space) \
((void)(((typeof(*p) space *)p) == p))
#else /* #ifdef __CHECKER__ */
-#define rcu_dereference_sparse(p, space)
+#define rcu_check_sparse(p, space)
#endif /* #else #ifdef __CHECKER__ */
#define __rcu_access_pointer(p, space) \
({ \
typeof(*p) *_________p1 = (typeof(*p) *__force)READ_ONCE(p); \
- rcu_dereference_sparse(p, space); \
+ rcu_check_sparse(p, space); \
((typeof(*p) __force __kernel *)(_________p1)); \
})
#define __rcu_dereference_check(p, c, space) \
@@ -326,13 +313,13 @@ static inline void rcu_preempt_sleep_check(void) { }
/* Dependency order vs. p above. */ \
typeof(*p) *________p1 = (typeof(*p) *__force)READ_ONCE(p); \
RCU_LOCKDEP_WARN(!(c), "suspicious rcu_dereference_check() usage"); \
- rcu_dereference_sparse(p, space); \
+ rcu_check_sparse(p, space); \
((typeof(*p) __force __kernel *)(________p1)); \
})
#define __rcu_dereference_protected(p, c, space) \
({ \
RCU_LOCKDEP_WARN(!(c), "suspicious rcu_dereference_protected() usage"); \
- rcu_dereference_sparse(p, space); \
+ rcu_check_sparse(p, space); \
((typeof(*p) __force __kernel *)(p)); \
})
#define rcu_dereference_raw(p) \
@@ -382,6 +369,7 @@ static inline void rcu_preempt_sleep_check(void) { }
#define rcu_assign_pointer(p, v) \
({ \
uintptr_t _r_a_p__v = (uintptr_t)(v); \
+ rcu_check_sparse(p, __rcu); \
\
if (__builtin_constant_p(v) && (_r_a_p__v) == (uintptr_t)NULL) \
WRITE_ONCE((p), (typeof(p))(_r_a_p__v)); \
@@ -785,7 +773,7 @@ static inline notrace void rcu_read_unlock_sched_notrace(void)
*/
#define RCU_INIT_POINTER(p, v) \
do { \
- rcu_dereference_sparse(p, __rcu); \
+ rcu_check_sparse(p, __rcu); \
WRITE_ONCE(p, RCU_INITIALIZER(v)); \
} while (0)
@@ -859,7 +847,7 @@ static inline notrace void rcu_read_unlock_sched_notrace(void)
/* Has the specified rcu_head structure been handed to call_rcu()? */
-/*
+/**
* rcu_head_init - Initialize rcu_head for rcu_head_after_call_rcu()
* @rhp: The rcu_head structure to initialize.
*
@@ -874,10 +862,10 @@ static inline void rcu_head_init(struct rcu_head *rhp)
rhp->func = (rcu_callback_t)~0L;
}
-/*
+/**
* rcu_head_after_call_rcu - Has this rcu_head been passed to call_rcu()?
* @rhp: The rcu_head structure to test.
- * @func: The function passed to call_rcu() along with @rhp.
+ * @f: The function passed to call_rcu() along with @rhp.
*
* Returns @true if the @rhp has been passed to call_rcu() with @func,
* and @false otherwise. Emits a warning in any other case, including
@@ -896,57 +884,4 @@ rcu_head_after_call_rcu(struct rcu_head *rhp, rcu_callback_t f)
return false;
}
-
-/* Transitional pre-consolidation compatibility definitions. */
-
-static inline void synchronize_rcu_bh(void)
-{
- synchronize_rcu();
-}
-
-static inline void synchronize_rcu_bh_expedited(void)
-{
- synchronize_rcu_expedited();
-}
-
-static inline void call_rcu_bh(struct rcu_head *head, rcu_callback_t func)
-{
- call_rcu(head, func);
-}
-
-static inline void rcu_barrier_bh(void)
-{
- rcu_barrier();
-}
-
-static inline void synchronize_sched(void)
-{
- synchronize_rcu();
-}
-
-static inline void synchronize_sched_expedited(void)
-{
- synchronize_rcu_expedited();
-}
-
-static inline void call_rcu_sched(struct rcu_head *head, rcu_callback_t func)
-{
- call_rcu(head, func);
-}
-
-static inline void rcu_barrier_sched(void)
-{
- rcu_barrier();
-}
-
-static inline unsigned long get_state_synchronize_sched(void)
-{
- return get_state_synchronize_rcu();
-}
-
-static inline void cond_synchronize_sched(unsigned long oldstate)
-{
- cond_synchronize_rcu(oldstate);
-}
-
#endif /* __LINUX_RCUPDATE_H */