From f9004dbfff8a3fbbd7e2a88c8a4327c7f2f8e5b2 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Wed, 31 Jan 2024 01:04:47 +0000
Subject: [PATCH] add driver 5G
---
kernel/include/linux/srcu.h | 122 +++++++++++++---------------------------
1 files changed, 41 insertions(+), 81 deletions(-)
diff --git a/kernel/include/linux/srcu.h b/kernel/include/linux/srcu.h
index 67135d4..a0895bb 100644
--- a/kernel/include/linux/srcu.h
+++ b/kernel/include/linux/srcu.h
@@ -1,24 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Sleepable 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 (C) IBM Corporation, 2006
* Copyright (C) Fujitsu, 2012
*
- * Author: Paul McKenney <paulmck@us.ibm.com>
+ * Author: Paul McKenney <paulmck@linux.ibm.com>
* Lai Jiangshan <laijs@cn.fujitsu.com>
*
* For detailed explanation of Read-Copy Update mechanism see -
@@ -38,20 +25,20 @@
#ifdef CONFIG_DEBUG_LOCK_ALLOC
-int __init_srcu_struct(struct srcu_struct *sp, const char *name,
+int __init_srcu_struct(struct srcu_struct *ssp, const char *name,
struct lock_class_key *key);
-#define init_srcu_struct(sp) \
+#define init_srcu_struct(ssp) \
({ \
static struct lock_class_key __srcu_key; \
\
- __init_srcu_struct((sp), #sp, &__srcu_key); \
+ __init_srcu_struct((ssp), #ssp, &__srcu_key); \
})
#define __SRCU_DEP_MAP_INIT(srcu_name) .dep_map = { .name = #srcu_name },
#else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
-int init_srcu_struct(struct srcu_struct *sp);
+int init_srcu_struct(struct srcu_struct *ssp);
#define __SRCU_DEP_MAP_INIT(srcu_name)
#endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */
@@ -67,52 +54,21 @@
struct srcu_struct { };
#endif
-void call_srcu(struct srcu_struct *sp, struct rcu_head *head,
+void call_srcu(struct srcu_struct *ssp, struct rcu_head *head,
void (*func)(struct rcu_head *head));
-void _cleanup_srcu_struct(struct srcu_struct *sp, bool quiesced);
-int __srcu_read_lock(struct srcu_struct *sp) __acquires(sp);
-void __srcu_read_unlock(struct srcu_struct *sp, int idx) __releases(sp);
-void synchronize_srcu(struct srcu_struct *sp);
-
-/**
- * cleanup_srcu_struct - deconstruct a sleep-RCU structure
- * @sp: structure to clean up.
- *
- * Must invoke this after you are finished using a given srcu_struct that
- * was initialized via init_srcu_struct(), else you leak memory.
- */
-static inline void cleanup_srcu_struct(struct srcu_struct *sp)
-{
- _cleanup_srcu_struct(sp, false);
-}
-
-/**
- * cleanup_srcu_struct_quiesced - deconstruct a quiesced sleep-RCU structure
- * @sp: structure to clean up.
- *
- * Must invoke this after you are finished using a given srcu_struct that
- * was initialized via init_srcu_struct(), else you leak memory. Also,
- * all grace-period processing must have completed.
- *
- * "Completed" means that the last synchronize_srcu() and
- * synchronize_srcu_expedited() calls must have returned before the call
- * to cleanup_srcu_struct_quiesced(). It also means that the callback
- * from the last call_srcu() must have been invoked before the call to
- * cleanup_srcu_struct_quiesced(), but you can use srcu_barrier() to help
- * with this last. Violating these rules will get you a WARN_ON() splat
- * (with high probability, anyway), and will also cause the srcu_struct
- * to be leaked.
- */
-static inline void cleanup_srcu_struct_quiesced(struct srcu_struct *sp)
-{
- _cleanup_srcu_struct(sp, true);
-}
+void cleanup_srcu_struct(struct srcu_struct *ssp);
+int __srcu_read_lock(struct srcu_struct *ssp) __acquires(ssp);
+void __srcu_read_unlock(struct srcu_struct *ssp, int idx) __releases(ssp);
+void synchronize_srcu(struct srcu_struct *ssp);
+unsigned long get_state_synchronize_srcu(struct srcu_struct *ssp);
+unsigned long start_poll_synchronize_srcu(struct srcu_struct *ssp);
+bool poll_state_synchronize_srcu(struct srcu_struct *ssp, unsigned long cookie);
#ifdef CONFIG_DEBUG_LOCK_ALLOC
/**
* srcu_read_lock_held - might we be in SRCU read-side critical section?
- * @sp: The srcu_struct structure to check
+ * @ssp: The srcu_struct structure to check
*
* If CONFIG_DEBUG_LOCK_ALLOC is selected, returns nonzero iff in an SRCU
* read-side critical section. In absence of CONFIG_DEBUG_LOCK_ALLOC,
@@ -126,16 +82,16 @@
* relies on normal RCU, it can be called from the CPU which
* is in the idle loop from an RCU point of view or offline.
*/
-static inline int srcu_read_lock_held(const struct srcu_struct *sp)
+static inline int srcu_read_lock_held(const struct srcu_struct *ssp)
{
if (!debug_lockdep_rcu_enabled())
return 1;
- return lock_is_held(&sp->dep_map);
+ return lock_is_held(&ssp->dep_map);
}
#else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
-static inline int srcu_read_lock_held(const struct srcu_struct *sp)
+static inline int srcu_read_lock_held(const struct srcu_struct *ssp)
{
return 1;
}
@@ -145,7 +101,7 @@
/**
* srcu_dereference_check - fetch SRCU-protected pointer for later dereferencing
* @p: the pointer to fetch and protect for later dereferencing
- * @sp: pointer to the srcu_struct, which is used to check that we
+ * @ssp: pointer to the srcu_struct, which is used to check that we
* really are in an SRCU read-side critical section.
* @c: condition to check for update-side use
*
@@ -154,29 +110,32 @@
* to 1. The @c argument will normally be a logical expression containing
* lockdep_is_held() calls.
*/
-#define srcu_dereference_check(p, sp, c) \
- __rcu_dereference_check((p), (c) || srcu_read_lock_held(sp), __rcu)
+#define srcu_dereference_check(p, ssp, c) \
+ __rcu_dereference_check((p), (c) || srcu_read_lock_held(ssp), __rcu)
/**
* srcu_dereference - fetch SRCU-protected pointer for later dereferencing
* @p: the pointer to fetch and protect for later dereferencing
- * @sp: pointer to the srcu_struct, which is used to check that we
+ * @ssp: pointer to the srcu_struct, which is used to check that we
* really are in an SRCU read-side critical section.
*
* Makes rcu_dereference_check() do the dirty work. If PROVE_RCU
* is enabled, invoking this outside of an RCU read-side critical
* section will result in an RCU-lockdep splat.
*/
-#define srcu_dereference(p, sp) srcu_dereference_check((p), (sp), 0)
+#define srcu_dereference(p, ssp) srcu_dereference_check((p), (ssp), 0)
/**
* srcu_dereference_notrace - no tracing and no lockdep calls from here
+ * @p: the pointer to fetch and protect for later dereferencing
+ * @ssp: pointer to the srcu_struct, which is used to check that we
+ * really are in an SRCU read-side critical section.
*/
-#define srcu_dereference_notrace(p, sp) srcu_dereference_check((p), (sp), 1)
+#define srcu_dereference_notrace(p, ssp) srcu_dereference_check((p), (ssp), 1)
/**
* srcu_read_lock - register a new reader for an SRCU-protected structure.
- * @sp: srcu_struct in which to register the new reader.
+ * @ssp: srcu_struct in which to register the new reader.
*
* Enter an SRCU read-side critical section. Note that SRCU read-side
* critical sections may be nested. However, it is illegal to
@@ -191,44 +150,45 @@
* srcu_read_unlock() in an irq handler if the matching srcu_read_lock()
* was invoked in process context.
*/
-static inline int srcu_read_lock(struct srcu_struct *sp) __acquires(sp)
+static inline int srcu_read_lock(struct srcu_struct *ssp) __acquires(ssp)
{
int retval;
- retval = __srcu_read_lock(sp);
- rcu_lock_acquire(&(sp)->dep_map);
+ retval = __srcu_read_lock(ssp);
+ rcu_lock_acquire(&(ssp)->dep_map);
return retval;
}
/* Used by tracing, cannot be traced and cannot invoke lockdep. */
static inline notrace int
-srcu_read_lock_notrace(struct srcu_struct *sp) __acquires(sp)
+srcu_read_lock_notrace(struct srcu_struct *ssp) __acquires(ssp)
{
int retval;
- retval = __srcu_read_lock(sp);
+ retval = __srcu_read_lock(ssp);
return retval;
}
/**
* srcu_read_unlock - unregister a old reader from an SRCU-protected structure.
- * @sp: srcu_struct in which to unregister the old reader.
+ * @ssp: srcu_struct in which to unregister the old reader.
* @idx: return value from corresponding srcu_read_lock().
*
* Exit an SRCU read-side critical section.
*/
-static inline void srcu_read_unlock(struct srcu_struct *sp, int idx)
- __releases(sp)
+static inline void srcu_read_unlock(struct srcu_struct *ssp, int idx)
+ __releases(ssp)
{
- rcu_lock_release(&(sp)->dep_map);
- __srcu_read_unlock(sp, idx);
+ WARN_ON_ONCE(idx & ~0x1);
+ rcu_lock_release(&(ssp)->dep_map);
+ __srcu_read_unlock(ssp, idx);
}
/* Used by tracing, cannot be traced and cannot call lockdep. */
static inline notrace void
-srcu_read_unlock_notrace(struct srcu_struct *sp, int idx) __releases(sp)
+srcu_read_unlock_notrace(struct srcu_struct *ssp, int idx) __releases(ssp)
{
- __srcu_read_unlock(sp, idx);
+ __srcu_read_unlock(ssp, idx);
}
/**
--
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