linux-kernel - Re: ioctl definition - has it changed recently?

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Date:	Tue, 17 Aug 2010 15:59:11 +0200
From:	Piotr Hosowicz <piotr@...owicz.com>
To:	piotr@...owicz.com
CC:	Arnd Bergmann <arnd@...db.de>, Sam Ravnborg <sam@...nborg.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: ioctl definition - has it changed recently?

On 17.08.2010 15:51, Piotr Hosowicz wrote:
> On 17.08.2010 15:18, Arnd Bergmann wrote:
>> On Tuesday 17 August 2010, Piotr Hosowicz wrote:
>>>>> Just take a look at all the other patches that went into the
>>>>> kernel to do this for other drivers.
>>>
>>> I do not know how to find them. :-(
>>
>> git log -p -S"unlocked_ioctl"
>
> Thanks a lot.
>
>>>> It seems different. How to change it? Now it works, I built it without
>>>> your remarks, exactly how I described on my blog:
>>>>
>>>> http://phosowicz.jogger.pl/2010/08/15/nvidia-graphics-in-fresh-kernels/
>>>
>>> Ok, as I wrote the prototypes differ. What should I do with the inode
>>> parameter?
>>
>> It's normally not needed.
>
> It seems so because the implementation nowwhere refers to the inode
> parameter. But I guess it won't be OK to just remove this parameter from
> the declaraion and the implemetation because some other NVidia code may
> refer to this parameter, pass it and so on. Potentially scrambling
> (spoiling) the parameter stack.

This is as I said, I just commented inode parameter and it wont build:

/root/nvidia/NVIDIA-Linux-x86_64-256.44/kernel/nv.c: At top level: 
 
 

/root/nvidia/NVIDIA-Linux-x86_64-256.44/kernel/nv.c:426: warning: 
initialization from incompatible pointer type 
 

/root/nvidia/NVIDIA-Linux-x86_64-256.44/kernel/nv.c: In function 
‘nv_kern_unlocked_ioctl’: 
 

/root/nvidia/NVIDIA-Linux-x86_64-256.44/kernel/nv.c:3062: warning: 
passing argument 1 of ‘nv_kern_ioctl’ from incompatible pointer type 
 

/root/nvidia/NVIDIA-Linux-x86_64-256.44/kernel/nv.c:2876: note: expected 
‘struct file *’ but argument is of type ‘struct inode *’ 
 

/root/nvidia/NVIDIA-Linux-x86_64-256.44/kernel/nv.c:3062: warning: 
passing argument 2 of ‘nv_kern_ioctl’ makes integer from pointer without 
a cast 

/root/nvidia/NVIDIA-Linux-x86_64-256.44/kernel/nv.c:2876: note: expected 
‘unsigned int’ but argument is of type ‘struct file *’ 
 

/root/nvidia/NVIDIA-Linux-x86_64-256.44/kernel/nv.c:3062: error: too 
many arguments to function ‘nv_kern_ioctl’ 
 

/root/nvidia/NVIDIA-Linux-x86_64-256.44/kernel/nv.c: In function 
‘nv_kern_compat_ioctl’: 
 

/root/nvidia/NVIDIA-Linux-x86_64-256.44/kernel/nv.c:3071: warning: 
passing argument 1 of ‘nv_kern_ioctl’ from incompatible pointer type 
 

/root/nvidia/NVIDIA-Linux-x86_64-256.44/kernel/nv.c:2876: note: expected 
‘struct file *’ but argument is of type ‘struct inode *’ 
 

/root/nvidia/NVIDIA-Linux-x86_64-256.44/kernel/nv.c:3071: warning: 
passing argument 2 of ‘nv_kern_ioctl’ makes integer from pointer without 
a cast 

/root/nvidia/NVIDIA-Linux-x86_64-256.44/kernel/nv.c:2876: note: expected 
‘unsigned int’ but argument is of type ‘struct file *’ 
 

/root/nvidia/NVIDIA-Linux-x86_64-256.44/kernel/nv.c:3071: error: too 
many arguments to function ‘nv_kern_ioctl’

Regards,

Piotr Hosowicz

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