linux-kernel - Re: [patch 16/30] mfd: ab8500-debugfs: Remove the racy fiddling with irq

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Date:   Fri, 11 Dec 2020 20:12:07 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
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Subject: Re: [patch 16/30] mfd: ab8500-debugfs: Remove the racy fiddling with irq_desc

On Thu, Dec 10, 2020 at 9:57 PM Thomas Gleixner <tglx@...utronix.de> wrote:
>
> First of all drivers have absolutely no business to dig into the internals
> of an irq descriptor. That's core code and subject to change. All of this
> information is readily available to /proc/interrupts in a safe and race
> free way.
>
> Remove the inspection code which is a blatant violation of subsystem
> boundaries and racy against concurrent modifications of the interrupt
> descriptor.
>
> Print the irq line instead so the information can be looked up in a sane
> way in /proc/interrupts.

...

> -               seq_printf(s, "%3i:  %6i %4i",
> +               seq_printf(s, "%3i:  %6i %4i %4i\n",

Seems different specifiers, I think the intention was something like
               seq_printf(s, "%3i:  %4i %6i %4i\n",

>                            line,
> +                          line + irq_first,
>                            num_interrupts[line],
>                            num_wake_interrupts[line]);


-- 
With Best Regards,
Andy Shevchenko