[PATCH v3] random: defer crediting bootloader randomness to random_init()

Phil Elwell phil at raspberrypi.com
Tue Jun 7 07:13:51 PDT 2022


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



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