linux-kernel - Re: [PATCH] arm64: Initialize jump labels before setup_machine

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Message-ID: <CAHmME9qBOwb==N9AWSSb8VhCXANsieWi7JpiiiUMvjU2rdb5XA@mail.gmail.com>
Date:   Thu, 2 Jun 2022 21:42:49 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     Stephen Boyd <swboyd@...omium.org>, Will Deacon <will@...nel.org>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Ard Biesheuvel <ardb@...nel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Douglas Anderson <dianders@...omium.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>, patches@...ts.linux.dev
Subject: Re: [PATCH] arm64: Initialize jump labels before setup_machine_fdt()

Hi Catalin,

On Thu, Jun 2, 2022 at 9:41 PM Catalin Marinas <catalin.marinas@....com> wrote:
>
> On Wed, 1 Jun 2022 19:21:09 -0700, Stephen Boyd wrote:
> > A static key warning splat appears during early boot on arm64 systems
> > that credit randomness from devicetrees that contain an "rng-seed"
> > property. This is because setup_machine_fdt() is called before
> > jump_label_init() during setup_arch(). Let's swap the order of these two
> > calls so that jump labels are initialized before the devicetree is
> > unflattened and the rng seed is credited.
> >
> > [...]
>
> Applied to arm64 (for-next/core), thanks!
>
> [1/1] arm64: Initialize jump labels before setup_machine_fdt()
>       https://git.kernel.org/arm64/c/73e2d827a501

I'm not sure precisely what your for-next tag corresponds to, but just
FYI, this should probably go into 5.19 asap and be marked for stable@.

Jason