linux-kernel - Re: [PATCH v3] random: defer crediting bootloader randomness to random

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Message-ID: <a696e6fe-7337-2f16-9349-13130bc7805e@raspberrypi.com>
Date:   Tue, 7 Jun 2022 15:13:51 +0100
From:   Phil Elwell <phil@...pberrypi.com>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Russell King <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v3] random: defer crediting bootloader randomness to
 random_init()

Jason,

On 07/06/2022 14:51, Jason A. Donenfeld wrote:
> Hi Phil,
> 
> And this one also works, I assume?
> 
> https://lore.kernel.org/lkml/20220607100210.683136-1-Jason@zx2c4.com/

Using the metrics "earlier is better2 and "shorter is better", that patch wins 
on both counts:

With 5.15.45 + CONFIG_RANDOM_TRUST_BOOTLOADER=y:
[    0.000000] random: crng init done
[    1.985290] bcm2835-rng 3f104000.rng: hwrng registered

With rpi-5.15.y:
[    0.000000] random: crng init done
[    1.969552] bcm2835-rng 3f104000.rng: hwrng registered

No splats in either, of course.

Phil