Messages in this thread Patch in this message | | | From | Rob Landley <> | Subject | [PATCH] Wire up CONFIG_DEVTMPFS_MOUNT to initramfs. | Date | Sun, 16 Jan 2022 12:36:49 -0600 |
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From: Rob Landley <rob@landley.net>
The kernel has had CONFIG_DEVTMPFS_MOUNT for years, but it only applied to fallback ROOT= not initramfs/initmpfs. As long as the config option exists, it might as well work.
I use this for board bringup: populating a chdir and calling cpio as a normal user often leaves /dev empty (because mknod requires root access), meaning no /dev/console for init/main.c to open, meaning init runs without stdin/stdout/stderr and has to mount devtmpfs and redirect the filehandles blind with no error output if something goes wrong.
Signed-off-by: Rob Landley <rob@landley.net> --- Previously: https://lkml.org/lkml/2017/9/13/651
init/main.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/init/main.c b/init/main.c index bb984ed79de0..288c73db57f4 100644 --- a/init/main.c +++ b/init/main.c @@ -1612,7 +1612,6 @@ static noinline void __init kernel_init_freeable(void) kunit_run_all_tests();
wait_for_initramfs(); - console_on_rootfs();
/* * check if there is an early userspace init. If yes, let it do all @@ -1621,7 +1620,11 @@ static noinline void __init kernel_init_freeable(void) if (init_eaccess(ramdisk_execute_command) != 0) { ramdisk_execute_command = NULL; prepare_namespace(); + } else if (IS_ENABLED(CONFIG_DEVTMPFS_MOUNT)) { + sys_mkdir("/dev", 0755); + devtmpfs_mount(); } + console_on_rootfs();
/* * Ok, we have completed the initial bootup, and
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