init: unify opening /dev/console as stdin/stdout/stderr (b49a733d) · Commits · 戴 / test

include/linux/initrd.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -28,3 +28,5 @@ extern unsigned int real_root_dev;

		extern char __initramfs_start[];
		extern unsigned long __initramfs_size;

		void console_on_rootfs(void);

+1 −4

Original line number	Diff line number	Diff line
		@@ -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);

+12 −5

Original line number	Diff line number	Diff line
		@@ -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