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From 3b6115d6b57a263bdc8c9b1df273bd4a7955eead Mon Sep 17 00:00:00 2001
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From: Felix Fietkau <nbd@nbd.name>
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Date: Sat, 8 Jul 2017 08:16:31 +0200
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Subject: debloat: add some debloat patches, strip down procfs and make O_DIRECT support optional, saves ~15K after lzma on MIPS
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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net/Kconfig | 3 +++
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net/core/Makefile | 3 ++-
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net/core/sock.c | 2 ++
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net/ipv4/Kconfig | 1 +
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net/netlink/Kconfig | 1 +
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net/packet/Kconfig | 1 +
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net/unix/Kconfig | 1 +
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7 files changed, 11 insertions(+), 1 deletion(-)
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--- a/net/Kconfig
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+++ b/net/Kconfig
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@@ -98,6 +98,9 @@ source "net/netlabel/Kconfig"
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endif # if INET
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+config SOCK_DIAG
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+ bool
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+
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config NETWORK_SECMARK
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bool "Security Marking"
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help
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--- a/net/core/Makefile
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+++ b/net/core/Makefile
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@@ -10,9 +10,10 @@ obj-$(CONFIG_SYSCTL) += sysctl_net_core.
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obj-y += dev.o ethtool.o dev_addr_lists.o dst.o netevent.o \
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neighbour.o rtnetlink.o utils.o link_watch.o filter.o \
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- sock_diag.o dev_ioctl.o tso.o sock_reuseport.o \
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+ dev_ioctl.o tso.o sock_reuseport.o \
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fib_notifier.o xdp.o
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+obj-$(CONFIG_SOCK_DIAG) += sock_diag.o
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obj-y += net-sysfs.o
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obj-$(CONFIG_PAGE_POOL) += page_pool.o
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obj-$(CONFIG_PROC_FS) += net-procfs.o
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--- a/net/core/sock.c
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+++ b/net/core/sock.c
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@@ -490,6 +490,18 @@ discard_and_relse:
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}
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EXPORT_SYMBOL(__sk_receive_skb);
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+u64 sock_gen_cookie(struct sock *sk)
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+{
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+ while (1) {
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+ u64 res = atomic64_read(&sk->sk_cookie);
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+
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+ if (res)
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+ return res;
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+ res = atomic64_inc_return(&sock_net(sk)->cookie_gen);
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+ atomic64_cmpxchg(&sk->sk_cookie, 0, res);
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+ }
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+}
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+
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struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
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{
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struct dst_entry *dst = __sk_dst_get(sk);
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@@ -1603,9 +1615,11 @@ static void __sk_free(struct sock *sk)
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if (likely(sk->sk_net_refcnt))
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sock_inuse_add(sock_net(sk), -1);
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+#ifdef CONFIG_SOCK_DIAG
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if (unlikely(sk->sk_net_refcnt && sock_diag_has_destroy_listeners(sk)))
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sock_diag_broadcast_destroy(sk);
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else
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+#endif
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sk_destruct(sk);
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}
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--- a/net/core/sock_diag.c
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+++ b/net/core/sock_diag.c
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@@ -20,18 +20,6 @@ static int (*inet_rcv_compat)(struct sk_
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static DEFINE_MUTEX(sock_diag_table_mutex);
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static struct workqueue_struct *broadcast_wq;
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-u64 sock_gen_cookie(struct sock *sk)
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-{
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- while (1) {
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- u64 res = atomic64_read(&sk->sk_cookie);
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-
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- if (res)
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- return res;
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- res = atomic64_inc_return(&sock_net(sk)->cookie_gen);
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- atomic64_cmpxchg(&sk->sk_cookie, 0, res);
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- }
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-}
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-
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int sock_diag_check_cookie(struct sock *sk, const __u32 *cookie)
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{
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u64 res;
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--- a/net/ipv4/Kconfig
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+++ b/net/ipv4/Kconfig
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@@ -426,6 +426,7 @@ config INET_XFRM_MODE_BEET
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config INET_DIAG
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tristate "INET: socket monitoring interface"
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+ select SOCK_DIAG
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default y
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---help---
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Support for INET (TCP, DCCP, etc) socket monitoring interface used by
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--- a/net/netlink/Kconfig
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+++ b/net/netlink/Kconfig
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@@ -4,6 +4,7 @@
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config NETLINK_DIAG
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tristate "NETLINK: socket monitoring interface"
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+ select SOCK_DIAG
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default n
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---help---
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Support for NETLINK socket monitoring interface used by the ss tool.
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--- a/net/packet/Kconfig
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+++ b/net/packet/Kconfig
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@@ -18,6 +18,7 @@ config PACKET
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config PACKET_DIAG
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tristate "Packet: sockets monitoring interface"
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depends on PACKET
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+ select SOCK_DIAG
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default n
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---help---
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Support for PF_PACKET sockets monitoring interface used by the ss tool.
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--- a/net/unix/Kconfig
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+++ b/net/unix/Kconfig
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@@ -22,6 +22,7 @@ config UNIX
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config UNIX_DIAG
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tristate "UNIX: socket monitoring interface"
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depends on UNIX
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+ select SOCK_DIAG
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default n
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---help---
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Support for UNIX socket monitoring interface used by the ss tool.
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