linux-kernel - Re: [PATCH RFC: linux-next 1/2] irq: Add CPU mask affinity hint callback framework

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Message-ID: <alpine.LFD.2.00.1004271425140.2951@localhost.localdomain>
Date:	Tue, 27 Apr 2010 14:32:22 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
cc:	davem@...emloft.net, arjan@...ux.jf.intel.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC: linux-next 1/2] irq: Add CPU mask affinity hint
 callback framework

On Sun, 18 Apr 2010, Peter P Waskiewicz Jr wrote:
> +/**
> + * struct irqaffinityhint - per interrupt affinity helper
> + * @callback:	device driver callback function
> + * @dev:	reference for the affected device
> + * @irq:	interrupt number
> + */
> +struct irqaffinityhint {
> +	irq_affinity_hint_t callback;
> +	void *dev;
> +	int irq;
> +};

Why do you need that extra data structure ? The device and the irq
number are known, so all you need is the callback itself. So no need
for allocating memory ....

> +static ssize_t irq_affinity_hint_proc_write(struct file *file,
> +		const char __user *buffer, size_t count, loff_t *pos)
> +{
> +	/* affinity_hint is read-only from proc */
> +	return -EOPNOTSUPP;
> +}
> +

Why do you want a write function when the file is read only ?

Thanks,

	tglx
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