disable uart0 uart7 uart9

hc

2023-11-22 983d7f83616922a6439b4352d1b3af488ee27f95

 kernel/include/linux/buffer_head.h
..
..
@@ -76,8 +76,50 @@
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 	struct address_space *b_assoc_map;	/* mapping this buffer is
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 						   associated with */
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 	atomic_t b_count;		/* users using this buffer_head */
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+#ifdef CONFIG_PREEMPT_RT_BASE
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+	spinlock_t b_uptodate_lock;
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+#if IS_ENABLED(CONFIG_JBD2)
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+	spinlock_t b_state_lock;
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+	spinlock_t b_journal_head_lock;
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+#endif
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+#endif
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 };
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+static inline unsigned long bh_uptodate_lock_irqsave(struct buffer_head *bh)
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+{
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+	unsigned long flags;
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+
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+#ifndef CONFIG_PREEMPT_RT_BASE
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+	local_irq_save(flags);
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+	bit_spin_lock(BH_Uptodate_Lock, &bh->b_state);
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+#else
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+	spin_lock_irqsave(&bh->b_uptodate_lock, flags);
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+#endif
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+	return flags;
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+}
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+
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+static inline void
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+bh_uptodate_unlock_irqrestore(struct buffer_head *bh, unsigned long flags)
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+{
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+#ifndef CONFIG_PREEMPT_RT_BASE
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+	bit_spin_unlock(BH_Uptodate_Lock, &bh->b_state);
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+	local_irq_restore(flags);
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+#else
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+	spin_unlock_irqrestore(&bh->b_uptodate_lock, flags);
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+#endif
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+}
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+
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+static inline void buffer_head_init_locks(struct buffer_head *bh)
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+{
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+#ifdef CONFIG_PREEMPT_RT_BASE
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+	spin_lock_init(&bh->b_uptodate_lock);
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+#if IS_ENABLED(CONFIG_JBD2)
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+	spin_lock_init(&bh->b_state_lock);
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+	spin_lock_init(&bh->b_journal_head_lock);
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+#endif
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+#endif
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+}
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+
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 /*
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  * macro tricks to expand the set_buffer_foo(), clear_buffer_foo()
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  * and buffer_foo() functions.