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From:   Dominik Brodowski <linux@dominikbrodowski.net>
To:     Alexander Viro <viro@zeniv.linux.org.uk>,
        Linus Torvalds <torvalds@linux-foundation.org>
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Rafael J . Wysocki" <rafael@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Ingo Molnar <mingo@kernel.org>, linux-kernel@vger.kernel.org
Subject: [PATCH 4/5] init: unify opening /dev/console as stdin/stdout/stderr
Date:   Thu, 12 Dec 2019 19:14:21 +0100
Message-Id: <20191212181422.31033-5-linux@dominikbrodowski.net>
In-Reply-To: <20191212181422.31033-1-linux@dominikbrodowski.net>
References: <20191212181422.31033-1-linux@dominikbrodowski.net>
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Merge the two instances where /dev/console is opened as
stdin/stdout/stderr.

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
---
 include/linux/initrd.h  |  2 ++
 init/do_mounts_initrd.c |  5 +----
 init/main.c             | 17 ++++++++++++-----
 3 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/include/linux/initrd.h b/include/linux/initrd.h
index d77fe34fb00a..aa5914355728 100644
--- a/include/linux/initrd.h
+++ b/include/linux/initrd.h
@@ -28,3 +28,5 @@ extern unsigned int real_root_dev;
 
 extern char __initramfs_start[];
 extern unsigned long __initramfs_size;
+
+void console_on_rootfs(void);
diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c
index 3bf7b74153ab..dab8b1151b56 100644
--- a/init/do_mounts_initrd.c
+++ b/init/do_mounts_initrd.c
@@ -48,10 +48,7 @@ early_param("initrd", early_initrd);
 static int init_linuxrc(struct subprocess_info *info, struct cred *new)
 {
 	ksys_unshare(CLONE_FS | CLONE_FILES);
-	/* stdin/stdout/stderr for /linuxrc */
-	ksys_open("/dev/console", O_RDWR, 0);
-	ksys_dup(0);
-	ksys_dup(0);
+	console_on_rootfs();
 	/* move initrd over / and chdir/chroot in initrd root */
 	ksys_chdir("/root");
 	do_mount(".", "/", NULL, MS_MOVE, NULL);
diff --git a/init/main.c b/init/main.c
index 91f6ebb30ef0..2cd736059416 100644
--- a/init/main.c
+++ b/init/main.c
@@ -1155,6 +1155,17 @@ static int __ref kernel_init(void *unused)
 	      "See Linux Documentation/admin-guide/init.rst for guidance.");
 }
 
+void console_on_rootfs(void)
+{
+	/* Open the /dev/console as stdin, this should never fail */
+	if (ksys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
+		pr_err("Warning: unable to open an initial console.\n");
+
+	/* create stdout/stderr */
+	(void) ksys_dup(0);
+	(void) ksys_dup(0);
+}
+
 static noinline void __init kernel_init_freeable(void)
 {
 	/*
@@ -1190,12 +1201,8 @@ static noinline void __init kernel_init_freeable(void)
 
 	do_basic_setup();
 
-	/* Open the /dev/console on the rootfs, this should never fail */
-	if (ksys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
-		pr_err("Warning: unable to open an initial console.\n");
+	console_on_rootfs();
 
-	(void) ksys_dup(0);
-	(void) ksys_dup(0);
 	/*
 	 * check if there is an early userspace init.  If yes, let it do all
 	 * the work
-- 
2.24.1