Re: [PATCH] genirq/proc: Add missing space separator back

[Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>]

Hi Thomas,

On Tue, Dec 3, 2024 at 11:40 AM Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:
> The recent conversion of show_interrupts() to seq_put_decimal_ull_width()
> caused a formatting regression as it drops a previosuly existing space
> separator.
>
> Add it back by unconditionally inserting a space after the interrupt
> counts and removing the extra leading space from the chip name prints.
>
> Fixes: f9ed1f7c2e26 ("genirq/proc: Use seq_put_decimal_ull_width() for decimal values")
> Reported-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Tested-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
> Closes: https://lore.kernel.org/all/4ce18851-6e9f-bbe-8319-cc5e69fb45c@xxxxxxxxxxxxxx

Thanks for your patch!

> --- a/kernel/irq/proc.c
> +++ b/kernel/irq/proc.c
> @@ -501,17 +501,18 @@ int show_interrupts(struct seq_file *p,
>
>                 seq_put_decimal_ull_width(p, " ", cnt, 10);
>         }
> +       seq_putc(p, ' ');
>
>         raw_spin_lock_irqsave(&desc->lock, flags);
>         if (desc->irq_data.chip) {
>                 if (desc->irq_data.chip->irq_print_chip)
>                         desc->irq_data.chip->irq_print_chip(&desc->irq_data, p);

You should also remove the leading space from the few .irq_print_chip()
callbacks that print such a space. According to

    git grep -lw irq_print_chip | xargs git grep -W "seq_.*\" "

and filterng out the false positives:

    arch/powerpc/sysdev/fsl_msi.c:  seq_printf(p, " fsl-msi-%d", cascade_virq);
    drivers/bus/moxtet.c:   seq_printf(p, " moxtet-%s.%i#%i",
mox_module_name(id), pos->idx,
    drivers/irqchip/irq-partition-percpu.c: seq_printf(p, " %5s-%lu",
chip->name, data->hwirq);
    drivers/soc/qcom/smp2p.c:       seq_printf(p, " %8s",
dev_name(entry->smp2p->dev));

>                 else if (desc->irq_data.chip->name)
> -                       seq_printf(p, " %8s", desc->irq_data.chip->name);
> +                       seq_printf(p, "%8s", desc->irq_data.chip->name);
>                 else
> -                       seq_printf(p, " %8s", "-");
> +                       seq_printf(p, "%8s", "-");
>         } else {
> -               seq_printf(p, " %8s", "None");
> +               seq_printf(p, "%8s", "None");
>         }
>         if (desc->irq_data.domain)
>                 seq_printf(p, " %*lu", prec, desc->irq_data.hwirq);

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds