Re: [PATCH v5] powerpc/powernv: wire up rng during setup_arch

[Christophe Leroy <christophe.leroy@csgroup.eu>]

Le 21/06/2022 à 16:08, Jason A. Donenfeld a écrit :
> The platform's RNG must be available before random_init() in order to be
> useful for initial seeding, which in turn means that it needs to be
> called from setup_arch(), rather than from an init call. Fortunately,
> each platform already has a setup_arch function pointer, which means we
> can wire it up that way. Complicating things, however, is that POWER8
> systems need some per-cpu state and kmalloc, which isn't available at
> this stage. So we split things up into an early phase and a later
> opportunistic phase. This commit also removes some noisy log messages
> that don't add much.

Regarding the kmalloc(), I have not looked at it in details, but usually 
you can use memblock_alloc() when kmalloc is not available yet.

Christophe