linux-kernel - Re: [PATCH] powerpc/rng: wire up during setup

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Date:   Sat, 11 Jun 2022 11:20:01 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH] powerpc/rng: wire up during setup_arch

Hi Christophe,

On Sat, Jun 11, 2022 at 09:16:24AM +0000, Christophe Leroy wrote:
> Le 11/06/2022 à 10:11, 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
> > it's easy to wire this up for each of the three platforms that have an
> > RNG. This commit also removes some noisy log messages that don't add
> > much.
> 
> Can't we use one of the machine initcalls for that ?
> Like machine_early_initcall() or machine_arch_initcall() ?

No, unfortunately. I tried this, and it's still too late. This must be
done in setup_arch().

> Today it is using  machine_subsys_initcall() and you didn't remove it. 
> It means rng_init() will be called twice. Is that ok ?

I did remove the calls to machine_subsys_initcall(). I just double
checked:

zx2c4@...nkpad ~/Projects/random-linux/arch/powerpc $ rg machine_subsys_initcall platforms/*/rng.c
zx2c4@...nkpad ~/Projects/random-linux/arch/powerpc $

Jason