Re: [PATCH v2] random: remove mostly unused async readiness notifier

Petr Mladek
2022-05-19T07:11:51Z

On Wed 2022-05-18 11:56:58, Jason A. Donenfeld wrote:
> The register_random_ready_notifier() notifier is somewhat complicated,
> and was already recently rewritten to use notifier blocks. It is only
> used now by one consumer in the kernel, vsprintf.c, for which the async
> mechanism is really overly complex for what it actually needs. This
> commit removes register_random_ready_notifier() and unregister_random_
> ready_notifier(), because it just adds complication with little utility,
> and changes vsprintf.c to just check on `!rng_is_initialized() &&
> !rng_has_arch_random()`, which will eventually be true. Performance-
> wise, that code was already using a static branch, so there's basically
> no overhead at all to this change.
>
> Cc: Petr Mladek <pmladek@suse.com>
> Cc: Steven Rostedt <rostedt@goodmis.org>
> Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
> Acked-by: Petr Mladek <pmladek@suse.com> # for vsprintf.c
> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
> ---
> Changes v1->v2:
> - Use a trylock instead of a spinlock to be NMI safe.

Looks good to me. My ack is already there. Feel free to use:

Reviewed-by: Petr Mladek <pmladek@suse.com>

if you would prefer it.

Thanks a lot for updating the patch.

Best Regards,
Petr