linux-kernel - Re: [PATCH v2] random: unify early init crng load accounting

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Date:   Mon, 21 Feb 2022 11:18:29 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     linux-kernel@...r.kernel.org, Theodore Ts'o <tytso@....edu>,
        Dominik Brodowski <linux@...inikbrodowski.net>
Subject: Re: [PATCH v2] random: unify early init crng load accounting

On Mon, Feb 21, 2022 at 04:24:56PM +0100, Jason A. Donenfeld wrote:
> crng_fast_load() and crng_slow_load() have different semantics:
> 
> - crng_fast_load() xors and accounts with crng_init_cnt.
> - crng_slow_load() hashes and doesn't account.
> 
> However add_hwgenerator_randomness() can afford to hash (it's called
> from a kthread), and it should account. Additionally, ones that can
> afford to hash don't need to take a trylock but can take a normal lock.
> So, we combine these into one function, crng_pre_init_inject(), which
> allows us to control these in a uniform way. This will make it simpler
> later to simplify this all down when the time comes for that.
> 
> Cc: Theodore Ts'o <tytso@....edu>
> Reviewed-by: Dominik Brodowski <linux@...inikbrodowski.net>
> Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
> ---
> Changes v1->v2:
> - cp -> input,
> - fix comment reference to old function,
> - fix brace style.
> 
>  drivers/char/random.c | 112 ++++++++++++++++++++++--------------------
>  1 file changed, 58 insertions(+), 54 deletions(-)

Reviewed-by: Eric Biggers <ebiggers@...gle.com>

- Eric