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 <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

net/unix/af_unix.c

···
 #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

···
 // 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

···
  *		wrt receive and holding up unrelated socket operations.
  */
 
-#include <linux/file.h>
 #include <linux/fs.h>
-#include <linux/kernel.h>
-#include <linux/netdevice.h>
-#include <linux/proc_fs.h>
+#include <linux/list.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

···
  * 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"