linux-kernel - Re: [RFC PATCH 1/3] genirq: add support for per-cpu dev

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Message-ID: <CAHXqBFKOQNOePc00yuzfotrYP6wT0ue_CJfv7rKdC+gEkomunA@mail.gmail.com>
Date:	Thu, 15 Sep 2011 23:36:23 +0200
From:	Michał Mirosław <mirqus@...il.com>
To:	Marc Zyngier <marc.zyngier@....com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC PATCH 1/3] genirq: add support for per-cpu dev_id interrupts

2011/9/15 Marc Zyngier <marc.zyngier@....com>:
[...]
> diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
> index a103732..f9b7fa3 100644
> --- a/include/linux/interrupt.h
> +++ b/include/linux/interrupt.h
> @@ -95,6 +95,7 @@ typedef irqreturn_t (*irq_handler_t)(int, void *);
>  * @flags:     flags (see IRQF_* above)
>  * @name:      name of the device
>  * @dev_id:    cookie to identify the device
> + * @percpu_dev_id:     cookie to identify the device
>  * @next:      pointer to the next irqaction for shared interrupts
>  * @irq:       interrupt number
>  * @dir:       pointer to the proc/irq/NN/name entry
> @@ -104,17 +105,20 @@ typedef irqreturn_t (*irq_handler_t)(int, void *);
>  * @thread_mask:       bitmask for keeping track of @thread activity
>  */
>  struct irqaction {
[...]
> +       void                    *dev_id;
> +#ifdef CONFIG_IRQ_PERCPU_DEVID
> +       void __percpu           *percpu_dev_id;
> +#endif

Those two can share the memory (in a anonymous union), if I read the
idea correctly.

Best Regards,
Michał Mirosław
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