sched/headers: Prepare for new header dependencies before moving code to <linux/sched/user.h>

We are going to split <linux/sched/user.h> out of <linux/sched.h>, which
will have to be picked up from other headers and a couple of .c files.

Create a trivial placeholder <linux/sched/user.h> file that just
maps to <linux/sched.h> to make this patch obviously correct and
bisectable.

Include the new header in the files that are going to need it.
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

block/ioprio.c

@@ -25,6 +25,7 @@
 #include <linux/ioprio.h>
 #include <linux/blkdev.h>
 #include <linux/capability.h>
+#include <linux/sched/user.h>
 #include <linux/syscalls.h>
 #include <linux/security.h>
 #include <linux/pid_namespace.h>

include/linux/cred.h

@@ -18,8 +18,8 @@
 #include <linux/selinux.h>
 #include <linux/atomic.h>
 #include <linux/uidgid.h>
+#include <linux/sched/user.h>
 
-struct user_struct;
 struct cred;
 struct inode;
 

include/linux/sched/user.h

+#ifndef _LINUX_SCHED_USER_H
+#define _LINUX_SCHED_USER_H
+
+#include <linux/sched.h>
+
+#endif /* _LINUX_SCHED_USER_H */

ipc/mqueue.c

@@ -37,6 +37,7 @@
 #include <linux/slab.h>
 #include <linux/sched/wake_q.h>
 #include <linux/sched/signal.h>
+#include <linux/sched/user.h>
 
 #include <net/sock.h>
 #include "util.h"

kernel/fork.c

@@ -15,6 +15,7 @@
 #include <linux/sched/autogroup.h>
 #include <linux/sched/mm.h>
 #include <linux/sched/coredump.h>
+#include <linux/sched/user.h>
 #include <linux/init.h>
 #include <linux/unistd.h>
 #include <linux/module.h>

kernel/signal.c

@@ -14,6 +14,7 @@
 #include <linux/export.h>
 #include <linux/init.h>
 #include <linux/sched.h>
+#include <linux/sched/user.h>
 #include <linux/fs.h>
 #include <linux/tty.h>
 #include <linux/binfmts.h>

kernel/user.c

@@ -13,6 +13,7 @@
 #include <linux/slab.h>
 #include <linux/bitops.h>
 #include <linux/key.h>
+#include <linux/sched/user.h>
 #include <linux/interrupt.h>
 #include <linux/export.h>
 #include <linux/user_namespace.h>

mm/mlock.c

@@ -8,6 +8,7 @@
 #include <linux/capability.h>
 #include <linux/mman.h>
 #include <linux/mm.h>
+#include <linux/sched/user.h>
 #include <linux/swap.h>
 #include <linux/swapops.h>
 #include <linux/pagemap.h>

net/core/scm.c

@@ -14,6 +14,7 @@
 #include <linux/capability.h>
 #include <linux/errno.h>
 #include <linux/sched.h>
+#include <linux/sched/user.h>
 #include <linux/mm.h>
 #include <linux/kernel.h>
 #include <linux/stat.h>

security/keys/process_keys.c

@@ -12,6 +12,7 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/sched.h>
+#include <linux/sched/user.h>
 #include <linux/keyctl.h>
 #include <linux/fs.h>
 #include <linux/err.h>