linux-kernel - Re: [PATCH v9 05/15] irqchip/sifive-plic: Convert PLIC driver into a platform driver

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Message-ID: <87bkdlma6j.wl-maz@kernel.org>
Date:   Fri, 29 Sep 2023 13:32:52 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Anup Patel <apatel@...tanamicro.com>
Cc:     Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Frank Rowand <frowand.list@...il.com>,
        Conor Dooley <conor+dt@...nel.org>,
        Atish Patra <atishp@...shpatra.org>,
        Andrew Jones <ajones@...tanamicro.com>,
        Sunil V L <sunilvl@...tanamicro.com>,
        Saravana Kannan <saravanak@...gle.com>,
        Anup Patel <anup@...infault.org>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v9 05/15] irqchip/sifive-plic: Convert PLIC driver into a platform driver

On Thu, 28 Sep 2023 07:11:57 +0100,
Anup Patel <apatel@...tanamicro.com> wrote:
> 
> The PLIC driver does not require very early initialization so let
> us convert it into a platform driver.
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> 
> As part of the conversion, the PLIC probing undergoes the following
> changes:
> 1. Use dev_info(), dev_err() and dev_warn() instead of pr_info(),
>    pr_err() and pr_warn()
> 2. Use devm_xyz() APIs wherever applicable
> 3. PLIC is now probed after CPUs are brought-up so we have to
>    setup cpuhp state after context handler of all online CPUs
>    are initialized otherwise we see crash on multi-socket systems
> 
> Signed-off-by: Anup Patel <apatel@...tanamicro.com>
> ---
>  drivers/irqchip/irq-sifive-plic.c | 242 +++++++++++++++++++-----------
>  1 file changed, 154 insertions(+), 88 deletions(-)
>

[...]

> +core_initcall(plic_init);

Or not. There are only two choices: either you absolutely require
early init, and you stick with the current situation, or you don't,
and you can rely on dependencies.

I'm not prepared to have a third option.

	M.

-- 
Without deviation from the norm, progress is not possible.