[PATCH 5/5] fix rootfstype=tmpfs
From: Rob Landley
Date: Tue Feb 21 2023 - 15:50:58 EST
Wire up rootfstype=tmpfs to force rootfs to be tmpfs even when you specify root=
Initramfs automatically uses tmpfs (if available) when you DON'T specify a
root= fallback root to mount over initramfs, but some people can't NOT do
that for some reason (old bootloaders), so let rootfstype=tmpfs override it.
My original code tried to do this 10 years ago but got the test wrong,
and nobody's corrected it since, so here you go...
Signed-off-by: Rob Landley <rob@xxxxxxxxxxx>
See https://lkml.iu.edu/hypermail/linux/kernel/2207.3/06939.html
---
init/do_mounts.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/init/do_mounts.c b/init/do_mounts.c
index 811e94daf0a8..01d80fb828fd 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -665,7 +665,7 @@ struct file_system_type rootfs_fs_type = {
void __init init_rootfs(void)
{
- if (IS_ENABLED(CONFIG_TMPFS) && !saved_root_name[0] &&
- (!root_fs_names || strstr(root_fs_names, "tmpfs")))
+ if (IS_ENABLED(CONFIG_TMPFS) && (!root_fs_names ? !saved_root_name[0] :
+ !!strstr(root_fs_names, "tmpfs")))
is_tmpfs = true;
}