add at24 driver

hc

2023-11-06 15ade055295d13f95d49e3d99b09f3bbfb4a43e7

 kernel/include/net/sch_generic.h
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@@ -10,6 +10,7 @@
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 #include <linux/percpu.h>
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 #include <linux/dynamic_queue_limits.h>
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 #include <linux/list.h>
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+#include <net/net_seq_lock.h>
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 #include <linux/refcount.h>
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 #include <linux/workqueue.h>
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 #include <net/gen_stats.h>
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@@ -100,7 +101,7 @@
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 	struct sk_buff_head	gso_skb ____cacheline_aligned_in_smp;
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 	struct qdisc_skb_head	q;
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 	struct gnet_stats_basic_packed bstats;
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-	seqcount_t		running;
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+	net_seqlock_t		running;
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 	struct gnet_stats_queue	qstats;
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 	unsigned long		state;
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 	struct Qdisc            *next_sched;
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@@ -137,7 +138,11 @@
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 {
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 	if (qdisc->flags & TCQ_F_NOLOCK)
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 		return spin_is_locked(&qdisc->seqlock);
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+#ifdef CONFIG_PREEMPT_RT_BASE
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+	return spin_is_locked(&qdisc->running.lock) ? true : false;
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+#else
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 	return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
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+#endif
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 }
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 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
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@@ -148,17 +153,27 @@
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 	} else if (qdisc_is_running(qdisc)) {
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 		return false;
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 	}
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+#ifdef CONFIG_PREEMPT_RT_BASE
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+	if (try_write_seqlock(&qdisc->running))
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+		return true;
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+	return false;
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+#else
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 	/* Variant of write_seqcount_begin() telling lockdep a trylock
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 	 * was attempted.
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 	 */
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 	raw_write_seqcount_begin(&qdisc->running);
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 	seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
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 	return true;
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+#endif
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 }
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 static inline void qdisc_run_end(struct Qdisc *qdisc)
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 {
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+#ifdef CONFIG_PREEMPT_RT_BASE
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+	write_sequnlock(&qdisc->running);
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+#else
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 	write_seqcount_end(&qdisc->running);
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+#endif
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 	if (qdisc->flags & TCQ_F_NOLOCK)
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 		spin_unlock(&qdisc->seqlock);
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 }
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@@ -475,7 +490,7 @@
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 	return qdisc_lock(root);
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 }
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-static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
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+static inline net_seqlock_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
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 {
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 	struct Qdisc *root = qdisc_root_sleeping(qdisc);
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