linux-kernel - Re: [PATCH] irqchip/loongarch: Adjust acpi_cascade_irqdomain

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Date:   Thu, 20 Oct 2022 19:49:51 +0800
From:   Huacai Chen <chenhuacai@...il.com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Huacai Chen <chenhuacai@...ngson.cn>,
        Thomas Gleixner <tglx@...utronix.de>,
        loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Xuefeng Li <lixuefeng@...ngson.cn>,
        Jiaxun Yang <jiaxun.yang@...goat.com>
Subject: Re: [PATCH] irqchip/loongarch: Adjust acpi_cascade_irqdomain_init()
 and sub-routines

On Thu, Oct 20, 2022 at 7:21 PM Marc Zyngier <maz@...nel.org> wrote:
>
> On Thu, 20 Oct 2022 08:33:46 +0100,
> Huacai Chen <chenhuacai@...ngson.cn> wrote:
> >
> > 1, Adjust prototype of acpi_cascade_irqdomain_init() because we don't
> >    need its return value.
> > 2, Combine unnecessary short lines to one long line.
> >
> > Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
> > ---
> >  drivers/irqchip/irq-loongarch-cpu.c    | 19 +++++++------------
> >  drivers/irqchip/irq-loongson-eiointc.c | 19 +++++++------------
> >  drivers/irqchip/irq-loongson-pch-pic.c | 11 ++++-------
> >  3 files changed, 18 insertions(+), 31 deletions(-)
> >
> > diff --git a/drivers/irqchip/irq-loongarch-cpu.c b/drivers/irqchip/irq-loongarch-cpu.c
> > index 741612ba6a52..093609c8eaa7 100644
> > --- a/drivers/irqchip/irq-loongarch-cpu.c
> > +++ b/drivers/irqchip/irq-loongarch-cpu.c
> > @@ -92,31 +92,26 @@ static const struct irq_domain_ops loongarch_cpu_intc_irq_domain_ops = {
> >       .xlate = irq_domain_xlate_onecell,
> >  };
> >
> > -static int __init
> > -liointc_parse_madt(union acpi_subtable_headers *header,
> > -                    const unsigned long end)
> > +static int __init liointc_parse_madt(union acpi_subtable_headers *header,
> > +                                     const unsigned long end)
> >  {
> >       struct acpi_madt_lio_pic *liointc_entry = (struct acpi_madt_lio_pic *)header;
> >
> >       return liointc_acpi_init(irq_domain, liointc_entry);
> >  }
> >
> > -static int __init
> > -eiointc_parse_madt(union acpi_subtable_headers *header,
> > -                    const unsigned long end)
> > +static int __init eiointc_parse_madt(union acpi_subtable_headers *header,
> > +                                     const unsigned long end)
> >  {
> >       struct acpi_madt_eio_pic *eiointc_entry = (struct acpi_madt_eio_pic *)header;
> >
> >       return eiointc_acpi_init(irq_domain, eiointc_entry);
> >  }
> >
> > -static int __init acpi_cascade_irqdomain_init(void)
> > +static void __init acpi_cascade_irqdomain_init(void)
> >  {
> > -     acpi_table_parse_madt(ACPI_MADT_TYPE_LIO_PIC,
> > -                           liointc_parse_madt, 0);
> > -     acpi_table_parse_madt(ACPI_MADT_TYPE_EIO_PIC,
> > -                           eiointc_parse_madt, 0);
> > -     return 0;
> > +     acpi_table_parse_madt(ACPI_MADT_TYPE_LIO_PIC, liointc_parse_madt, 0);
> > +     acpi_table_parse_madt(ACPI_MADT_TYPE_EIO_PIC, eiointc_parse_madt, 0);
>
> This definitely looks like it is moving in the wrong direction. The
> parsing can return an error, and you're not handling it anywhere.
> Given how often firmware tables are broken, this seems pretty bad.
Oh, I'm sorry, I have misunderstood your reply in another thread. :(

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