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, 173 deletions

diff --git a/target/linux/generic/backport-5.4/080-wireguard-0134-wireguard-allowedips-allocate-nodes-in-kmem_cache.patch b/target/linux/generic/backport-5.4/080-wireguard-0134-wireguard-allowedips-allocate-nodes-in-kmem_cache.patch
deleted file mode 100644
index 65b31b05f5..0000000000
--- a/target/linux/generic/backport-5.4/080-wireguard-0134-wireguard-allowedips-allocate-nodes-in-kmem_cache.patch
+++ /dev/null
@@ -1,173 +0,0 @@
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: "Jason A. Donenfeld" <Jason@zx2c4.com>
-Date: Fri, 4 Jun 2021 17:17:37 +0200
-Subject: [PATCH] wireguard: allowedips: allocate nodes in kmem_cache
-
-commit dc680de28ca849dfe589dc15ac56d22505f0ef11 upstream.
-
-The previous commit moved from O(n) to O(1) for removal, but in the
-process introduced an additional pointer member to a struct that
-increased the size from 60 to 68 bytes, putting nodes in the 128-byte
-slab. With deployed systems having as many as 2 million nodes, this
-represents a significant doubling in memory usage (128 MiB -> 256 MiB).
-Fix this by using our own kmem_cache, that's sized exactly right. This
-also makes wireguard's memory usage more transparent in tools like
-slabtop and /proc/slabinfo.
-
-Fixes: e7096c131e51 ("net: WireGuard secure network tunnel")
-Suggested-by: Arnd Bergmann <arnd@arndb.de>
-Suggested-by: Matthew Wilcox <willy@infradead.org>
-Cc: stable@vger.kernel.org
-Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
-Signed-off-by: David S. Miller <davem@davemloft.net>
-Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
----
- drivers/net/wireguard/allowedips.c | 31 ++++++++++++++++++++++++------
- drivers/net/wireguard/allowedips.h |  5 ++++-
- drivers/net/wireguard/main.c       | 10 +++++++++-
- 3 files changed, 38 insertions(+), 8 deletions(-)
-
---- a/drivers/net/wireguard/allowedips.c
-+++ b/drivers/net/wireguard/allowedips.c
-@@ -6,6 +6,8 @@
- #include "allowedips.h"
- #include "peer.h"
- 
-+static struct kmem_cache *node_cache;
-+
- static void swap_endian(u8 *dst, const u8 *src, u8 bits)
- {
- 	if (bits == 32) {
-@@ -40,6 +42,11 @@ static void push_rcu(struct allowedips_n
- 	}
- }
- 
-+static void node_free_rcu(struct rcu_head *rcu)
-+{
-+	kmem_cache_free(node_cache, container_of(rcu, struct allowedips_node, rcu));
-+}
-+
- static void root_free_rcu(struct rcu_head *rcu)
- {
- 	struct allowedips_node *node, *stack[128] = {
-@@ -49,7 +56,7 @@ static void root_free_rcu(struct rcu_hea
- 	while (len > 0 && (node = stack[--len])) {
- 		push_rcu(stack, node->bit[0], &len);
- 		push_rcu(stack, node->bit[1], &len);
--		kfree(node);
-+		kmem_cache_free(node_cache, node);
- 	}
- }
- 
-@@ -164,7 +171,7 @@ static int add(struct allowedips_node __
- 		return -EINVAL;
- 
- 	if (!rcu_access_pointer(*trie)) {
--		node = kzalloc(sizeof(*node), GFP_KERNEL);
-+		node = kmem_cache_zalloc(node_cache, GFP_KERNEL);
- 		if (unlikely(!node))
- 			return -ENOMEM;
- 		RCU_INIT_POINTER(node->peer, peer);
-@@ -180,7 +187,7 @@ static int add(struct allowedips_node __
- 		return 0;
- 	}
- 
--	newnode = kzalloc(sizeof(*newnode), GFP_KERNEL);
-+	newnode = kmem_cache_zalloc(node_cache, GFP_KERNEL);
- 	if (unlikely(!newnode))
- 		return -ENOMEM;
- 	RCU_INIT_POINTER(newnode->peer, peer);
-@@ -213,10 +220,10 @@ static int add(struct allowedips_node __
- 		return 0;
- 	}
- 
--	node = kzalloc(sizeof(*node), GFP_KERNEL);
-+	node = kmem_cache_zalloc(node_cache, GFP_KERNEL);
- 	if (unlikely(!node)) {
- 		list_del(&newnode->peer_list);
--		kfree(newnode);
-+		kmem_cache_free(node_cache, newnode);
- 		return -ENOMEM;
- 	}
- 	INIT_LIST_HEAD(&node->peer_list);
-@@ -306,7 +313,7 @@ void wg_allowedips_remove_by_peer(struct
- 		if (child)
- 			child->parent_bit = node->parent_bit;
- 		*rcu_dereference_protected(node->parent_bit, lockdep_is_held(lock)) = child;
--		kfree_rcu(node, rcu);
-+		call_rcu(&node->rcu, node_free_rcu);
- 
- 		/* TODO: Note that we currently don't walk up and down in order to
- 		 * free any potential filler nodes. This means that this function
-@@ -350,4 +357,16 @@ struct wg_peer *wg_allowedips_lookup_src
- 	return NULL;
- }
- 
-+int __init wg_allowedips_slab_init(void)
-+{
-+	node_cache = KMEM_CACHE(allowedips_node, 0);
-+	return node_cache ? 0 : -ENOMEM;
-+}
-+
-+void wg_allowedips_slab_uninit(void)
-+{
-+	rcu_barrier();
-+	kmem_cache_destroy(node_cache);
-+}
-+
- #include "selftest/allowedips.c"
---- a/drivers/net/wireguard/allowedips.h
-+++ b/drivers/net/wireguard/allowedips.h
-@@ -19,7 +19,7 @@ struct allowedips_node {
- 	u8 bits[16] __aligned(__alignof(u64));
- 
- 	/* Keep rarely used members at bottom to be beyond cache line. */
--	struct allowedips_node *__rcu *parent_bit; /* XXX: this puts us at 68->128 bytes instead of 60->64 bytes!! */
-+	struct allowedips_node *__rcu *parent_bit;
- 	union {
- 		struct list_head peer_list;
- 		struct rcu_head rcu;
-@@ -53,4 +53,7 @@ struct wg_peer *wg_allowedips_lookup_src
- bool wg_allowedips_selftest(void);
- #endif
- 
-+int wg_allowedips_slab_init(void);
-+void wg_allowedips_slab_uninit(void);
-+
- #endif /* _WG_ALLOWEDIPS_H */
---- a/drivers/net/wireguard/main.c
-+++ b/drivers/net/wireguard/main.c
-@@ -21,10 +21,15 @@ static int __init mod_init(void)
- {
- 	int ret;
- 
-+	ret = wg_allowedips_slab_init();
-+	if (ret < 0)
-+		goto err_allowedips;
-+
- #ifdef DEBUG
-+	ret = -ENOTRECOVERABLE;
- 	if (!wg_allowedips_selftest() || !wg_packet_counter_selftest() ||
- 	    !wg_ratelimiter_selftest())
--		return -ENOTRECOVERABLE;
-+		goto err_peer;
- #endif
- 	wg_noise_init();
- 
-@@ -50,6 +55,8 @@ err_netlink:
- err_device:
- 	wg_peer_uninit();
- err_peer:
-+	wg_allowedips_slab_uninit();
-+err_allowedips:
- 	return ret;
- }
- 
-@@ -58,6 +65,7 @@ static void __exit mod_exit(void)
- 	wg_genetlink_uninit();
- 	wg_device_uninit();
- 	wg_peer_uninit();
-+	wg_allowedips_slab_uninit();
- }
- 
- module_init(mod_init);