On Saturday 30 August 2008, Tejun Heo wrote:

[...]

quoted

Actually it seems that CONFIG_DEBUG_BLOCK_EXT_DEVT introduction (which I
think is a nice step forward) is a good oportunity to put the deprecation
of the default root device further, i.e. it may be worth to hook the
default root device check and/or CONFIG_DEBUG_BLOCK_EXT_DEVT one into
mount_block_root().

Maybe we can add a warning there if BLOCK_EXT_DEVT is enabled or do
you have something else on mind?

Yes, this is would be nice, having warning on using the default root
device (instead of "root=") would be even nicer.

Thanks,
Bart