Subject: RE: [PATCH v2] arm64: kexec: Check if IRQ is already masked before masking

From: "Farber, Eliav" <[email-masked]>
Date: Thu, 28 Nov 2024 20:07:57 +0000

On 11/28/2024 12:39 PM, Thomas Gleixner wrote:
> This is just wrong. If the interrupt was torn down, then its state is deactivated and it was masked already. So the EOI handling and the mask/disable dance are neither required nor make sense.
>
> So this whole thing should be:
>
>                 chip = irq_desc_get_chip(desc);
> -               if (!chip)
> +               if (!chip || !irqd_is_started(&desc->irq_data))
>                         continue;
ACK. Will be done this way in V3.

> But what's worse is that we have 4 almost identical variants of the same code.
>
> So instead of exposing core functionality and "fixing" up four variants, can we please have a consolidated version of this function in the core
> code:
>                 struct irq_chip *chip;
>                 int check_eoi = 1;
>
>                 chip = irq_desc_get_chip(desc);
>                 if (!chip || !irqd_is_started(&desc->irq_data))
>                         continue;
>
>                 if (IS_ENABLED(CONFIG_.....)) {
>                         /*
>                          * Add a sensible comment which explains this.
>                          */
>                         check_eoi = irq_set_irqchip_state(....);
>                 }
>
>                 if (check_eoi && ....)
>                         chip->irq_eoi(&desc->irq_data);
>
>                 irq_shutdown(desc);
>
> No?
In V3 I will add a preliminary patch that will remove the four variants
and instead add a common implementations to the kexec core.

Thanks, Eliav