linux-kernel - Re: [PATCH v4 08/19] irqdomain: Refactor __irq_domain_alloc

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Date:   Tue, 17 Jan 2023 22:34:40 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Johan Hovold <johan+linaro@...nel.org>,
        Marc Zyngier <maz@...nel.org>
Cc:     x86@...nel.org, platform-driver-x86@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Johan Hovold <johan+linaro@...nel.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Mark-PK Tsai <mark-pk.tsai@...iatek.com>
Subject: Re: [PATCH v4 08/19] irqdomain: Refactor __irq_domain_alloc_irqs()

On Mon, Jan 16 2023 at 14:50, Johan Hovold wrote:

> Refactor __irq_domain_alloc_irqs() so that it can be called internally
> while holding the irq_domain_mutex.
>
> This will be used to fix a shared-interrupt mapping race.

No functional change. The split out internal function will be used to
fix a shared interrupt mapping race. This change is therefore tagged
with the same fixes tag.

Fixes: ....

> -int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
> -			    unsigned int nr_irqs, int node, void *arg,
> -			    bool realloc, const struct irq_affinity_desc *affinity)
> +static int ___irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
> +				    unsigned int nr_irqs, int node, void *arg,
> +				    bool realloc, const struct irq_affinity_desc *affinity)

__ vs. ___ is almost undistinguishable.

irq_domain_alloc_irqs_locked() nicely explains what this is about, no?

Thanks,

        tglx