linux-kernel - Re: [PATCH] ISDN/capidrv: fix casting warning

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Message-ID: <47213AA6.6040909@garzik.org>
Date:	Thu, 25 Oct 2007 20:53:58 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Karsten Keil <kkeil@...e.de>
CC:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] ISDN/capidrv: fix casting warning

Karsten Keil wrote:
> On Thu, Oct 25, 2007 at 04:06:16AM -0400, Jeff Garzik wrote:
>> drivers/isdn/capi/capidrv.c: In function 'if_sendbuf':
>> drivers/isdn/capi/capidrv.c:1865: warning: cast from pointer to integer
>> of different size
>>
>> We are passing a kernel pointer, skb->data, but the interface itself is
>> limited to 32 bits.  A future changeset may want to mark this code
>> 32-bit only, if it turns out cmsg->Data value truncation on 64-bit
>> platforms is problematic in practice.
>>
> 
> I think I should really add somewhere a comment for this issue.
> This field is not used in practice in linux kernel (neither in 32 or
> 64 bit), but should have some value, since a CAPI message trace will
> display it.
> The correct value in the 32 bit case is the address of the
> data, in 64 bit it makes no sense, maybe we should use 0 here.

So noted...  I will make sure the next revision of the patch fulfills 
all your wishes :)

	Jeff


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