linux-kernel - Re: [PATCH 1/2 v2] staging: comedi: new adl

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Message-ID: <502A134C.4000406@mev.co.uk>
Date:	Tue, 14 Aug 2012 09:58:52 +0100
From:	Ian Abbott <abbotti@....co.uk>
To:	H Hartley Sweeten <hartleys@...ionengravers.com>
CC:	Greg KH <gregkh@...uxfoundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	Ian Abbott <ian.abbott@....co.uk>
Subject: Re: [PATCH 1/2 v2] staging: comedi: new adl_pci7x3x driver

On 2012-08-14 02:36, H Hartley Sweeten wrote:
> On Monday, August 13, 2012 6:30 PM, Greg KH wrote:
>> On Fri, Aug 03, 2012 at 10:28:18AM -0700, H Hartley Sweeten wrote:
>>> Currently the ADLink PCI-7230 and PCI-7432 Isolated Digital
>>> I/O Boards are supported using two drivers (adl_pci7230 and
>>> adl_pci7432). These drivers are very similar and only differ
>>> in the total number of di/do channels provided.
>>>
>>> This driver combines the support for both boards into one
>>> common driver. In addition, it adds PCI PnP support for the
>>> other boards in the ADLink PCI-723x and PCI-743x series.
>>>
>>> This driver only supports the comedi PCI auto config attach
>>> mechanism. The legacy attach using the comedi_config utility
>>> is not supported or required by this driver.
>>
>> I now get the following build warnings on my box with this patch
>> applied:
>>
>> drivers/staging/comedi/drivers/adl_pci7x3x.c: In function ‘adl_pci7x3x_do_insn_bits’:
>> drivers/staging/comedi/drivers/adl_pci7x3x.c:124:21: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
>> drivers/staging/comedi/drivers/adl_pci7x3x.c: In function ‘adl_pci7x3x_di_insn_bits’:
>> drivers/staging/comedi/drivers/adl_pci7x3x.c:150:21: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
>
> Hmm.. My build does not have the [-Wpointer-to-int-cast] for some reason
> so I didn't see this. I was trying to save having to allocate any private data but
> I guess it's cleaner if I do.  BTW, there is another comedi driver that does this
> but I can't recall which one of the top of my head...

You could always cast to unsigned long as that is the same size as a 
pointer, at least in the Linux kernel.

-- 
-=( Ian Abbott @ MEV Ltd.    E-mail: <abbotti@....co.uk>        )=-
-=( Tel: +44 (0)161 477 1898   FAX: +44 (0)161 718 3587         )=-

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