linux-kernel - Re: [PATCH v4 01/11] mfd: add pruss mfd driver.

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Date:	Wed, 27 Apr 2011 18:48:54 +0530
From:	"Subhasish Ghosh" <subhasish@...tralsolutions.com>
To:	"Russell King - ARM Linux" <linux@....linux.org.uk>,
	"Marc Kleine-Budde" <mkl@...gutronix.de>
Cc:	<sachi@...tralsolutions.com>,
	<davinci-linux-open-source@...ux.davincidsp.com>,
	"Samuel Ortiz" <sameo@...ux.intel.com>, <nsekhar@...com>,
	"open list" <linux-kernel@...r.kernel.org>, <m-watkins@...com>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 01/11] mfd: add pruss mfd driver.

My problem is, I am doing something like this:

s32 pruss_writel_multi(struct device *dev, u32 offset,
                u32 *pdatatowrite, u16 wordstowrite)
{
        struct pruss_priv *pruss = dev_get_drvdata(dev->parent);
        u32 __iomem *paddresstowrite;
        u16 i;

        paddresstowrite = pruss->ioaddr + offset;

        for (i = 0; i < wordstowrite; i++)
                iowrite32(*pdatatowrite++, paddresstowrite++);

        return 0;
}

So, if I make paddresstowrite as void, it will not work. 
The above implementation does not generate any sparse errors though.


> On Wed, Apr 27, 2011 at 09:29:59AM +0200, Marc Kleine-Budde wrote:
>> On 04/27/2011 08:39 AM, Subhasish Ghosh wrote:
>> > - Is it ok to have u32 etc for __iomem cookie ?
>> 
>> no - "void __iomem *" is "void __iomem *"
> 
> Actually, it is _provided_ you don't directly dereference it.  You can
> then do pointer arithmetic on it in the usual way - which is about the
> only valid thing to do with an __iomem pointer.  The voidness just acts
> as an additional check against direct dereferences of this.
> 
> The important thing though is that the code passes sparse checks. 
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