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2024-11-01 2f529f9b558ca1c1bd74be7437a84e4711743404

 kernel/include/linux/rcupdate.h
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@@ -118,6 +118,14 @@
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 static inline void rcu_nocb_flush_deferred_wakeup(void) { }
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 #endif /* #else #ifdef CONFIG_RCU_NOCB_CPU */
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+#ifdef CONFIG_IRQ_PIPELINE
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+void rcu_oob_prepare_lock(void);
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+void rcu_oob_finish_lock(void);
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+#else
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+#define rcu_oob_prepare_lock()	 do { } while (0)
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+#define rcu_oob_finish_lock()	 do { } while (0)
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+#endif
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+
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 /**
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  * RCU_NONIDLE - Indicate idle-loop code that needs RCU readers
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  * @a: Code that RCU needs to pay attention to.
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@@ -290,7 +298,7 @@
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 static inline int rcu_read_lock_sched_held(void)
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 {
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-	return !preemptible();
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+	return !running_inband() || !preemptible();
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 }
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 static inline int rcu_read_lock_any_held(void)
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@@ -646,6 +654,7 @@
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  */
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 static __always_inline void rcu_read_lock(void)
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 {
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+	rcu_oob_prepare_lock();
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 	__rcu_read_lock();
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 	__acquire(RCU);
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 	rcu_lock_acquire(&rcu_lock_map);
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@@ -702,6 +711,7 @@
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 			 "rcu_read_unlock() used illegally while idle");
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 	__release(RCU);
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 	__rcu_read_unlock();
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+	rcu_oob_finish_lock();
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 	rcu_lock_release(&rcu_lock_map); /* Keep acq info for rls diags. */
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 }
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@@ -755,6 +765,7 @@
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 static inline void rcu_read_lock_sched(void)
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 {
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 	preempt_disable();
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+	rcu_oob_prepare_lock();
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 	__acquire(RCU_SCHED);
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 	rcu_lock_acquire(&rcu_sched_lock_map);
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 	RCU_LOCKDEP_WARN(!rcu_is_watching(),
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@@ -779,6 +790,7 @@
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 			 "rcu_read_unlock_sched() used illegally while idle");
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 	rcu_lock_release(&rcu_sched_lock_map);
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 	__release(RCU_SCHED);
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+	rcu_oob_finish_lock();
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 	preempt_enable();
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 }
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