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hc

2023-11-20 21dac118b553f9ebfb6b3a809dbe1794dfa9fb0b

 kernel/include/linux/percpu-rwsem.h
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@@ -29,7 +29,7 @@
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 extern int __percpu_down_read(struct percpu_rw_semaphore *, int);
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 extern void __percpu_up_read(struct percpu_rw_semaphore *);
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-static inline void percpu_down_read_preempt_disable(struct percpu_rw_semaphore *sem)
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+static inline void percpu_down_read(struct percpu_rw_semaphore *sem)
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 {
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 	might_sleep();
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@@ -47,16 +47,10 @@
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 	__this_cpu_inc(*sem->read_count);
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 	if (unlikely(!rcu_sync_is_idle(&sem->rss)))
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 		__percpu_down_read(sem, false); /* Unconditional memory barrier */
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-	barrier();
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 	/*
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-	 * The barrier() prevents the compiler from
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+	 * The preempt_enable() prevents the compiler from
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 	 * bleeding the critical section out.
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 	 */
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-}
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-
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-static inline void percpu_down_read(struct percpu_rw_semaphore *sem)
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-{
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-	percpu_down_read_preempt_disable(sem);
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 	preempt_enable();
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 }
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@@ -83,13 +77,9 @@
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 	return ret;
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 }
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-static inline void percpu_up_read_preempt_enable(struct percpu_rw_semaphore *sem)
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+static inline void percpu_up_read(struct percpu_rw_semaphore *sem)
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 {
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-	/*
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-	 * The barrier() prevents the compiler from
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-	 * bleeding the critical section out.
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-	 */
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-	barrier();
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+	preempt_disable();
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 	/*
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 	 * Same as in percpu_down_read().
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 	 */
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@@ -100,12 +90,6 @@
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 	preempt_enable();
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 	rwsem_release(&sem->rw_sem.dep_map, 1, _RET_IP_);
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-}
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-
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-static inline void percpu_up_read(struct percpu_rw_semaphore *sem)
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-{
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-	preempt_disable();
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-	percpu_up_read_preempt_enable(sem);
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 }
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 extern void percpu_down_write(struct percpu_rw_semaphore *);