linux-kernel - Re: [PATCH v7 01/15] RISC-V: Add riscv_get_intc

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Date:   Wed, 2 Aug 2023 18:18:51 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Andrew Jones <ajones@...tanamicro.com>
Cc:     Anup Patel <apatel@...tanamicro.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        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>,
        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 v7 01/15] RISC-V: Add riscv_get_intc_hartid() function

On Wed, Aug 02, 2023 at 08:09:18PM +0300, Andrew Jones wrote:
> On Wed, Aug 02, 2023 at 08:30:04PM +0530, Anup Patel wrote:
> > We add a common riscv_get_intc_hartid() which help device drivers to
> > get hartid of the HART associated with a INTC (i.e. local interrupt
> > controller) fwnode. This new function is more generic compared to
> > the existing riscv_of_parent_hartid() function hence we also replace
> > use of riscv_of_parent_hartid() with riscv_get_intc_hartid().
> > 
> > Also, while we are here let us update riscv_of_parent_hartid() to
> > always return the hartid irrespective whether the CPU/HART DT node
> > is disabled or not.
> 
> This change should probably be a separate patch with its own
> justification in its commit message.

Yeah, it certainly needs a justification, not just an "oh, btw I did
this". It also invalidates the comment above the function, so that
would need to be changed too.

> > diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c
> > index a2fc952318e9..c3eaa8a55bbe 100644
> > --- a/arch/riscv/kernel/cpu.c
> > +++ b/arch/riscv/kernel/cpu.c
> > @@ -81,21 +81,35 @@ int riscv_early_of_processor_hartid(struct device_node *node, unsigned long *har
> >   * To achieve this, we walk up the DT tree until we find an active
                                                                 ^^^^^^

> >   * RISC-V core (HART) node and extract the cpuid from it.
> >   */
> > -int riscv_of_parent_hartid(struct device_node *node, unsigned long *hartid)
> > +static int riscv_of_parent_hartid(struct device_node *node,

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