proc: register filesystem last

As soon as register_filesystem() exits, filesystem can be mounted.  It
is better to present fully operational /proc.

Of course it doesn't matter because /proc is not modular but do it
anyway.

Drop error check, it should be handled by panicking.

Link: http://lkml.kernel.org/r/20180309222709.GA3843@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/proc/root.c b/fs/proc/root.c
index cd45abf..9e99204 100644 (file)
--- a/fs/proc/root.c
+++ b/fs/proc/root.c
@@ -123,14 +123,8 @@ static struct file_system_type proc_fs_type = {
 
 void __init proc_root_init(void)
 {
-       int err;
-
        proc_init_kmemcache();
        set_proc_pid_nlink();
-       err = register_filesystem(&proc_fs_type);
-       if (err)
-               return;
-
        proc_self_init();
        proc_thread_self_init();
        proc_symlink("mounts", NULL, "self/mounts");
@@ -146,6 +140,8 @@ void __init proc_root_init(void)
        proc_tty_init();
        proc_mkdir("bus", NULL);
        proc_sys_init();
+
+       register_filesystem(&proc_fs_type);
 }
 
 static int proc_root_getattr(const struct path *path, struct kstat *stat,