Am Dienstag, 24. April 2018, 18:27:12 CEST schrieb Michal Hocko:
> fs/ubifs/debug.c

This one is just for debugging.
So, preallocating + locking would not hurt much.

> fs/ubifs/lprops.c

Ditto.

> fs/ubifs/lpt_commit.c

Here we use it also only in debugging mode and in one case for
fatal error reporting.
No hot paths.

> fs/ubifs/orphan.c

Also only for debugging.
Getting rid of vmalloc with GFP_NOFS in UBIFS is no big problem.
I can prepare a patch.

Thanks,
//richard