[Bug 214001] [bisected][regression] After commit "drm/ttm: Initialize debugfs from ttm_global_init()" kernels without debugfs explicitly set to 'allow all' fail to boot

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=214001

--- Comment #1 from Linux_Chemist (untaintableangel@hotmail.co.uk) ---
As an addendum, I suppose a slight source of confusion is the info for 

CONFIG_DEBUG_FS which reads:

"debugfs is a virtual file system that kernel developers use to put
debugging files into. Enable this option to be able to read and
write to these files.

For detailed documentation on the debugfs API, see
Documentation/filesystems/.

If unsure, say N."

which implies: a) that it isn't strictly necessary to have enabled in order to
boot/run normally (highlighting this bug) and b) that you would have zero need
for it if you weren't reading/writing to these debugging files. 


To then have the option to enable debugfs but only run minimally with
CONFIG_DEBUG_FS_ALLOW_NONE:
"Access is off. Clients get -PERM when trying to create nodes in
debugfs tree and debugfs is not registered as a filesystem.
Client can then back-off or continue without debugfs access."

leaves the question of 'why have it on and set to "allow none" rather than off
completely?'

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