kernel: delete Linux 5.4 config and patches

As the upcoming release will be based on Linux 5.10 only, remove all
kernel configuration as well as patches for Linux 5.4.
There were no targets still actively using Linux 5.4.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
(cherry picked from commit 3a14580411adfb75f9a44eded9f41245b9e44606)

1 files changed, 0 insertions, 261 deletions

diff --git a/target/linux/generic/backport-5.4/601-v5.12-net-implement-threaded-able-napi-poll-loop-support.patch b/target/linux/generic/backport-5.4/601-v5.12-net-implement-threaded-able-napi-poll-loop-support.patch
deleted file mode 100644
index 0c548f331a..0000000000
--- a/target/linux/generic/backport-5.4/601-v5.12-net-implement-threaded-able-napi-poll-loop-support.patch
+++ /dev/null
@@ -1,261 +0,0 @@
-From: Wei Wang <weiwan@google.com>
-Date: Mon, 8 Feb 2021 11:34:09 -0800
-Subject: [PATCH] net: implement threaded-able napi poll loop support
-
-This patch allows running each napi poll loop inside its own
-kernel thread.
-The kthread is created during netif_napi_add() if dev->threaded
-is set. And threaded mode is enabled in napi_enable(). We will
-provide a way to set dev->threaded and enable threaded mode
-without a device up/down in the following patch.
-
-Once that threaded mode is enabled and the kthread is
-started, napi_schedule() will wake-up such thread instead
-of scheduling the softirq.
-
-The threaded poll loop behaves quite likely the net_rx_action,
-but it does not have to manipulate local irqs and uses
-an explicit scheduling point based on netdev_budget.
-
-Co-developed-by: Paolo Abeni <pabeni@redhat.com>
-Signed-off-by: Paolo Abeni <pabeni@redhat.com>
-Co-developed-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
-Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
-Co-developed-by: Jakub Kicinski <kuba@kernel.org>
-Signed-off-by: Jakub Kicinski <kuba@kernel.org>
-Signed-off-by: Wei Wang <weiwan@google.com>
-Reviewed-by: Alexander Duyck <alexanderduyck@fb.com>
-Signed-off-by: David S. Miller <davem@davemloft.net>
----
-
---- a/include/linux/netdevice.h
-+++ b/include/linux/netdevice.h
-@@ -340,6 +340,7 @@ struct napi_struct {
- 	struct list_head	dev_list;
- 	struct hlist_node	napi_hash_node;
- 	unsigned int		napi_id;
-+	struct task_struct	*thread;
- };
- 
- enum {
-@@ -350,6 +351,7 @@ enum {
- 	NAPI_STATE_HASHED,	/* In NAPI hash (busy polling possible) */
- 	NAPI_STATE_NO_BUSY_POLL,/* Do not add in napi_hash, no busy polling */
- 	NAPI_STATE_IN_BUSY_POLL,/* sk_busy_loop() owns this NAPI */
-+	NAPI_STATE_THREADED,		/* The poll is performed inside its own thread*/
- };
- 
- enum {
-@@ -360,6 +362,7 @@ enum {
- 	NAPIF_STATE_HASHED	 = BIT(NAPI_STATE_HASHED),
- 	NAPIF_STATE_NO_BUSY_POLL = BIT(NAPI_STATE_NO_BUSY_POLL),
- 	NAPIF_STATE_IN_BUSY_POLL = BIT(NAPI_STATE_IN_BUSY_POLL),
-+	NAPIF_STATE_THREADED	 = BIT(NAPI_STATE_THREADED),
- };
- 
- enum gro_result {
-@@ -504,20 +507,7 @@ bool napi_hash_del(struct napi_struct *n
-  */
- void napi_disable(struct napi_struct *n);
- 
--/**
-- *	napi_enable - enable NAPI scheduling
-- *	@n: NAPI context
-- *
-- * Resume NAPI from being scheduled on this context.
-- * Must be paired with napi_disable.
-- */
--static inline void napi_enable(struct napi_struct *n)
--{
--	BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
--	smp_mb__before_atomic();
--	clear_bit(NAPI_STATE_SCHED, &n->state);
--	clear_bit(NAPI_STATE_NPSVC, &n->state);
--}
-+void napi_enable(struct napi_struct *n);
- 
- /**
-  *	napi_synchronize - wait until NAPI is not running
-@@ -1783,6 +1773,8 @@ enum netdev_ml_priv_type {
-  *
-  *	@wol_enabled:	Wake-on-LAN is enabled
-  *
-+ *	@threaded:	napi threaded mode is enabled
-+ *
-  *	FIXME: cleanup struct net_device such that network protocol info
-  *	moves out.
-  */
-@@ -2075,6 +2067,7 @@ struct net_device {
- 	struct lock_class_key	addr_list_lock_key;
- 	bool			proto_down;
- 	unsigned		wol_enabled:1;
-+	unsigned		threaded:1;
- };
- #define to_net_dev(d) container_of(d, struct net_device, dev)
- 
---- a/net/core/dev.c
-+++ b/net/core/dev.c
-@@ -91,6 +91,7 @@
- #include <linux/etherdevice.h>
- #include <linux/ethtool.h>
- #include <linux/skbuff.h>
-+#include <linux/kthread.h>
- #include <linux/bpf.h>
- #include <linux/bpf_trace.h>
- #include <net/net_namespace.h>
-@@ -1289,6 +1290,27 @@ void netdev_notify_peers(struct net_devi
- }
- EXPORT_SYMBOL(netdev_notify_peers);
- 
-+static int napi_threaded_poll(void *data);
-+
-+static int napi_kthread_create(struct napi_struct *n)
-+{
-+	int err = 0;
-+
-+	/* Create and wake up the kthread once to put it in
-+	 * TASK_INTERRUPTIBLE mode to avoid the blocked task
-+	 * warning and work with loadavg.
-+	 */
-+	n->thread = kthread_run(napi_threaded_poll, n, "napi/%s-%d",
-+				n->dev->name, n->napi_id);
-+	if (IS_ERR(n->thread)) {
-+		err = PTR_ERR(n->thread);
-+		pr_err("kthread_run failed with err %d\n", err);
-+		n->thread = NULL;
-+	}
-+
-+	return err;
-+}
-+
- static int __dev_open(struct net_device *dev, struct netlink_ext_ack *extack)
- {
- 	const struct net_device_ops *ops = dev->netdev_ops;
-@@ -3888,6 +3910,21 @@ int gro_normal_batch __read_mostly = 8;
- static inline void ____napi_schedule(struct softnet_data *sd,
- 				     struct napi_struct *napi)
- {
-+	struct task_struct *thread;
-+
-+	if (test_bit(NAPI_STATE_THREADED, &napi->state)) {
-+		/* Paired with smp_mb__before_atomic() in
-+		 * napi_enable(). Use READ_ONCE() to guarantee
-+		 * a complete read on napi->thread. Only call
-+		 * wake_up_process() when it's not NULL.
-+		 */
-+		thread = READ_ONCE(napi->thread);
-+		if (thread) {
-+			wake_up_process(thread);
-+			return;
-+		}
-+	}
-+
- 	list_add_tail(&napi->poll_list, &sd->poll_list);
- 	__raise_softirq_irqoff(NET_RX_SOFTIRQ);
- }
-@@ -6279,6 +6316,12 @@ void netif_napi_add(struct net_device *d
- 	set_bit(NAPI_STATE_NPSVC, &napi->state);
- 	list_add_rcu(&napi->dev_list, &dev->napi_list);
- 	napi_hash_add(napi);
-+	/* Create kthread for this napi if dev->threaded is set.
-+	 * Clear dev->threaded if kthread creation failed so that
-+	 * threaded mode will not be enabled in napi_enable().
-+	 */
-+	if (dev->threaded && napi_kthread_create(napi))
-+		dev->threaded = 0;
- }
- EXPORT_SYMBOL(netif_napi_add);
- 
-@@ -6295,9 +6338,28 @@ void napi_disable(struct napi_struct *n)
- 	hrtimer_cancel(&n->timer);
- 
- 	clear_bit(NAPI_STATE_DISABLE, &n->state);
-+	clear_bit(NAPI_STATE_THREADED, &n->state);
- }
- EXPORT_SYMBOL(napi_disable);
- 
-+/**
-+ *	napi_enable - enable NAPI scheduling
-+ *	@n: NAPI context
-+ *
-+ * Resume NAPI from being scheduled on this context.
-+ * Must be paired with napi_disable.
-+ */
-+void napi_enable(struct napi_struct *n)
-+{
-+	BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
-+	smp_mb__before_atomic();
-+	clear_bit(NAPI_STATE_SCHED, &n->state);
-+	clear_bit(NAPI_STATE_NPSVC, &n->state);
-+	if (n->dev->threaded && n->thread)
-+		set_bit(NAPI_STATE_THREADED, &n->state);
-+}
-+EXPORT_SYMBOL(napi_enable);
-+
- static void flush_gro_hash(struct napi_struct *napi)
- {
- 	int i;
-@@ -6322,6 +6384,11 @@ void netif_napi_del(struct napi_struct *
- 
- 	flush_gro_hash(napi);
- 	napi->gro_bitmask = 0;
-+
-+	if (napi->thread) {
-+		kthread_stop(napi->thread);
-+		napi->thread = NULL;
-+	}
- }
- EXPORT_SYMBOL(netif_napi_del);
- 
-@@ -6401,6 +6468,51 @@ static int napi_poll(struct napi_struct
- 	return work;
- }
- 
-+static int napi_thread_wait(struct napi_struct *napi)
-+{
-+	set_current_state(TASK_INTERRUPTIBLE);
-+
-+	while (!kthread_should_stop() && !napi_disable_pending(napi)) {
-+		if (test_bit(NAPI_STATE_SCHED, &napi->state)) {
-+			WARN_ON(!list_empty(&napi->poll_list));
-+			__set_current_state(TASK_RUNNING);
-+			return 0;
-+		}
-+
-+		schedule();
-+		set_current_state(TASK_INTERRUPTIBLE);
-+	}
-+	__set_current_state(TASK_RUNNING);
-+	return -1;
-+}
-+
-+static int napi_threaded_poll(void *data)
-+{
-+	struct napi_struct *napi = data;
-+	void *have;
-+
-+	while (!napi_thread_wait(napi)) {
-+		for (;;) {
-+			bool repoll = false;
-+
-+			local_bh_disable();
-+
-+			have = netpoll_poll_lock(napi);
-+			__napi_poll(napi, &repoll);
-+			netpoll_poll_unlock(have);
-+
-+			__kfree_skb_flush();
-+			local_bh_enable();
-+
-+			if (!repoll)
-+				break;
-+
-+			cond_resched();
-+		}
-+	}
-+	return 0;
-+}
-+
- static __latent_entropy void net_rx_action(struct softirq_action *h)
- {
- 	struct softnet_data *sd = this_cpu_ptr(&softnet_data);