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/rcupdate.h | 23 ++++++++++++-----------
1 files changed, 12 insertions(+), 11 deletions(-)
diff --git a/kernel/include/linux/rcupdate.h b/kernel/include/linux/rcupdate.h
index 1effcae..a833efa 100644
--- a/kernel/include/linux/rcupdate.h
+++ b/kernel/include/linux/rcupdate.h
@@ -54,11 +54,6 @@
* types of kernel builds, the rcu_read_lock() nesting depth is unknowable.
*/
#define rcu_preempt_depth() (current->rcu_read_lock_nesting)
-#ifndef CONFIG_PREEMPT_RT
-#define sched_rcu_preempt_depth() rcu_preempt_depth()
-#else
-static inline int sched_rcu_preempt_depth(void) { return 0; }
-#endif
#else /* #ifdef CONFIG_PREEMPT_RCU */
@@ -84,13 +79,11 @@
return 0;
}
-#define sched_rcu_preempt_depth() rcu_preempt_depth()
-
#endif /* #else #ifdef CONFIG_PREEMPT_RCU */
/* Internal to kernel */
void rcu_init(void);
-extern int rcu_scheduler_active __read_mostly;
+extern int rcu_scheduler_active;
void rcu_sched_clock_irq(int user);
void rcu_report_dead(unsigned int cpu);
void rcutree_migrate_callbacks(int cpu);
@@ -196,6 +189,7 @@
#define rcu_note_voluntary_context_switch(t) rcu_tasks_qs(t, false)
void exit_tasks_rcu_start(void);
+void exit_tasks_rcu_stop(void);
void exit_tasks_rcu_finish(void);
#else /* #ifdef CONFIG_TASKS_RCU_GENERIC */
#define rcu_tasks_qs(t, preempt) do { } while (0)
@@ -203,6 +197,7 @@
#define call_rcu_tasks call_rcu
#define synchronize_rcu_tasks synchronize_rcu
static inline void exit_tasks_rcu_start(void) { }
+static inline void exit_tasks_rcu_stop(void) { }
static inline void exit_tasks_rcu_finish(void) { }
#endif /* #else #ifdef CONFIG_TASKS_RCU_GENERIC */
@@ -313,11 +308,18 @@
* RCU_LOCKDEP_WARN - emit lockdep splat if specified condition is met
* @c: condition to check
* @s: informative message
+ *
+ * This checks debug_lockdep_rcu_enabled() before checking (c) to
+ * prevent early boot splats due to lockdep not yet being initialized,
+ * and rechecks it after checking (c) to prevent false-positive splats
+ * due to races with lockdep being disabled. See commit 3066820034b5dd
+ * ("rcu: Reject RCU_LOCKDEP_WARN() false positives") for more detail.
*/
#define RCU_LOCKDEP_WARN(c, s) \
do { \
static bool __section(".data.unlikely") __warned; \
- if ((c) && debug_lockdep_rcu_enabled() && !__warned) { \
+ if (debug_lockdep_rcu_enabled() && (c) && \
+ debug_lockdep_rcu_enabled() && !__warned) { \
__warned = true; \
lockdep_rcu_suspicious(__FILE__, __LINE__, s); \
} \
@@ -336,8 +338,7 @@
#define rcu_sleep_check() \
do { \
rcu_preempt_sleep_check(); \
- if (!IS_ENABLED(CONFIG_PREEMPT_RT)) \
- RCU_LOCKDEP_WARN(lock_is_held(&rcu_bh_lock_map), \
+ RCU_LOCKDEP_WARN(lock_is_held(&rcu_bh_lock_map), \
"Illegal context switch in RCU-bh read-side critical section"); \
RCU_LOCKDEP_WARN(lock_is_held(&rcu_sched_lock_map), \
"Illegal context switch in RCU-sched read-side critical section"); \
--
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