Latest UBI/UBIFS requires DebugFs?

[Bill Pringlemeir]

I have pulled the latest UBI/UBIFS from
git://git.infradead.org/users/dedekind/ubifs-v2.6.36.git.  I think that
the same issue may exist on the head.

If your root device is ubifs and you do not configure with
CONFIG_DEBUG_FS, then several functions will fail and the root will not
be mounted.  Depending on other configurations, you might not get any
error messages.

It appears that ubi_debugfs_init_dev, ubi_debugfs_init,
dbg_debugfs_init_fs, and dbg_debugfs_init rely on DEBUGFS and return
errors when creating DEBUGFS files.

I think either we could conditionalize these functions to return 0 when
DEBUGFS is not present or use a '#error UBI/UBIFS not supported without
DebugFs'.

I think maybe this was an over zealous commit to get good bug reports
and the DEBUGFS itself is not needed, but just the other printk stuff in 
the debug.c files?

I can submit a patch, but I think the explanation above is probably
enough for someone else with a better understanding of the structure.

Regards,
Bill Pringlemeir.