af_unix: Clean up #include under net/unix/.

net/unix/*.c include many unnecessary header files (rtnetlink.h,
netdevice.h, etc).

Let's clean them up.

af_unix.c:

  +uapi/linux/sockios.h   : Only exist under include/uapi
  +uapi/linux/termios.h   : Only exist under include/uapi

  -linux/freezer.h        : No longer use freezable_schedule_timeout()
  -linux/in.h             : No ipv4_is_XXX() etc
  -linux/module.h         : No longer support CONFIG_UNIX=m
  -linux/netdevice.h      : No dev used
  -linux/rtnetlink.h      : Not part of rtnetlink API
  -linux/signal.h         : signal_pending() is defined in sched/signal.h
  -linux/stat.h           : No struct stat used
  -net/checksum.h         : CHECKSUM_UNNECESSARY is defined in skbuff.h

diag.c:

  +linux/dcache.h         : struct dentry in sk_diag_dump_vfs()
  +linux/user_namespace.h : struct user_namespace in sk_diag_dump_uid()
  +uapi/linux/unix_diag.h : Only exist under include/uapi/

garbage.c:

  +linux/list.h           : struct unix_{vertex,edge}, etc
  +linux/workqueue.h      : DECLARE_WORK(unix_gc_work, ...)

  -linux/file.h           : No fget() etc
  -linux/kernel.h         : No cond_resched() etc
  -linux/netdevice.h      : No dev used
  -linux/proc_fs.h        : No procfs provided
  -linux/string.h         : No memcpy(), kmemdup(), etc

sysctl_net_unix.c:

  +linux/string.h         : kmemdup()
  +net/net_namespace.h    : struct net, net_eq()

  -linux/mm.h             : slab.h is enough

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20250318034934.86708-5-kuniyu@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

net/unix/af_unix.c

@@ -84,36 +84,28 @@
 #include <linux/fcntl.h>
 #include <linux/file.h>
 #include <linux/filter.h>
-#include <linux/freezer.h>
 #include <linux/fs.h>
-#include <linux/in.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
-#include <linux/module.h>
 #include <linux/mount.h>
 #include <linux/namei.h>
-#include <linux/netdevice.h>
 #include <linux/poll.h>
 #include <linux/proc_fs.h>
-#include <linux/rtnetlink.h>
 #include <linux/sched/signal.h>
 #include <linux/security.h>
 #include <linux/seq_file.h>
-#include <linux/signal.h>
 #include <linux/skbuff.h>
 #include <linux/slab.h>
 #include <linux/socket.h>
-#include <linux/sockios.h>
 #include <linux/splice.h>
-#include <linux/stat.h>
 #include <linux/string.h>
-#include <linux/termios.h>
 #include <linux/uaccess.h>
 #include <net/af_unix.h>
-#include <net/checksum.h>
 #include <net/net_namespace.h>
 #include <net/scm.h>
 #include <net/tcp_states.h>
+#include <uapi/linux/sockios.h>
+#include <uapi/linux/termios.h>
 
 #include "af_unix.h"
 

net/unix/diag.c

@@ -1,13 +1,15 @@
 // SPDX-License-Identifier: GPL-2.0-only
 
+#include <linux/dcache.h>
 #include <linux/module.h>
 #include <linux/skbuff.h>
 #include <linux/sock_diag.h>
 #include <linux/types.h>
-#include <linux/unix_diag.h>
+#include <linux/user_namespace.h>
 #include <net/af_unix.h>
 #include <net/netlink.h>
 #include <net/tcp_states.h>
+#include <uapi/linux/unix_diag.h>
 
 #include "af_unix.h"
 

net/unix/garbage.c

@@ -63,14 +63,11 @@
  *		wrt receive and holding up unrelated socket operations.
  */
 
-#include <linux/file.h>
 #include <linux/fs.h>
-#include <linux/kernel.h>
+#include <linux/list.h>
-#include <linux/netdevice.h>
-#include <linux/proc_fs.h>
 #include <linux/skbuff.h>
 #include <linux/socket.h>
-#include <linux/string.h>
+#include <linux/workqueue.h>
 #include <net/af_unix.h>
 #include <net/scm.h>
 #include <net/tcp_states.h>

net/unix/sysctl_net_unix.c

@@ -5,10 +5,11 @@
  * Authors:	Mike Shaver.
  */
 
-#include <linux/mm.h>
 #include <linux/slab.h>
+#include <linux/string.h>
 #include <linux/sysctl.h>
 #include <net/af_unix.h>
+#include <net/net_namespace.h>
 
 #include "af_unix.h"