add can driver

hc

2023-12-02 57e32c52610e6a560beda60bf33c48f9f42306d5

 kernel/include/linux/list_bl.h
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@@ -3,6 +3,7 @@
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 #define _LINUX_LIST_BL_H
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 #include <linux/list.h>
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+#include <linux/spinlock.h>
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 #include <linux/bit_spinlock.h>
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 /*
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@@ -33,13 +34,24 @@
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 struct hlist_bl_head {
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 	struct hlist_bl_node *first;
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+#ifdef CONFIG_PREEMPT_RT_BASE
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+	raw_spinlock_t lock;
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+#endif
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 };
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 struct hlist_bl_node {
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 	struct hlist_bl_node *next, **pprev;
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 };
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-#define INIT_HLIST_BL_HEAD(ptr) \
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-	((ptr)->first = NULL)
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+
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+#ifdef CONFIG_PREEMPT_RT_BASE
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+#define INIT_HLIST_BL_HEAD(h)		\
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+do {					\
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+	(h)->first = NULL;		\
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+	raw_spin_lock_init(&(h)->lock);	\
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+} while (0)
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+#else
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+#define INIT_HLIST_BL_HEAD(h) (h)->first = NULL
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+#endif
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 static inline void INIT_HLIST_BL_NODE(struct hlist_bl_node *h)
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 {
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@@ -119,12 +131,26 @@
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 static inline void hlist_bl_lock(struct hlist_bl_head *b)
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 {
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+#ifndef CONFIG_PREEMPT_RT_BASE
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 	bit_spin_lock(0, (unsigned long *)b);
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+#else
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+	raw_spin_lock(&b->lock);
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+#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
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+	__set_bit(0, (unsigned long *)b);
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+#endif
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+#endif
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 }
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 static inline void hlist_bl_unlock(struct hlist_bl_head *b)
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 {
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+#ifndef CONFIG_PREEMPT_RT_BASE
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 	__bit_spin_unlock(0, (unsigned long *)b);
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+#else
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+#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
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+	__clear_bit(0, (unsigned long *)b);
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+#endif
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+	raw_spin_unlock(&b->lock);
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+#endif
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 }
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 static inline bool hlist_bl_is_locked(struct hlist_bl_head *b)