Am Dienstag, 18. Juli 2017, 11:02:02 CEST schrieb Arnd Bergmann:

Hi Arnd,

I can see why the jitterentropy implementation avoids using kernel headers,
the problem now is that part of it gets moved into a new header, and that
already violates the original principle.

From my reading of the code, we could probably leave the structure
definition in the crypto/jitterentropy.c, and have the statically
allocated instance in the same file when CONFIG_LRNG is
set,

That is a very good idea -- I will implement this approach.

or provide a way to allocate an instance early (I assume you
can't call jent_entropy_collector_alloc() here since you need
the RNG long before kzalloc() works).

Correct. I cannot assume that any of the memory allocation routines are 
available.

Thank you.

Ciao
Stephan