[Xenomai-core] RTDM mmap and vm_operations

[Xenomai-core] RTDM mmap and vm_operations

[Rodrigo Rosenfeld Rosas]

Hi Jan,

Is there a way of knowing what was the src_addr or pptr data passed to 
rtdm_mmap_to_user without using the vm_private_data struct? I mean, can I 
obtain those information directly in the vma struct passed to the close 
handler? If so, I could pass a more generic struct to vm_private and use 
those information,making my life a bit easier... :)

Thanks in advance,

Rodrigo.

		
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Re: [Xenomai-core] RTDM mmap and vm_operations

[Jan Kiszka]

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Rodrigo Rosenfeld Rosas wrote:
> Hi Jan,
> 
> Is there a way of knowing what was the src_addr or pptr data passed to 
> rtdm_mmap_to_user without using the vm_private_data struct? I mean, can I 
> obtain those information directly in the vma struct passed to the close 
> handler? If so, I could pass a more generic struct to vm_private and use 
> those information,making my life a bit easier... :)
> 

I do not see a clean, official way right now. It would definitely be
something you have to obtain via vma_area_struct or something that's
contained in it. The information is likely there - somewhere. But I
doubt that obtaining it would make your code very portable across
different kernel versions.

Jan


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Re: [Xenomai-core] RTDM mmap and vm_operations

[Rodrigo Rosenfeld Rosas]

Jan Kiszka escreveu:
> Rodrigo Rosenfeld Rosas wrote:
>   
>> Hi Jan,
>>
>> Is there a way of knowing what was the src_addr or pptr data passed to 
>> rtdm_mmap_to_user without using the vm_private_data struct? I mean, can I 
>> obtain those information directly in the vma struct passed to the close 
>> handler? If so, I could pass a more generic struct to vm_private and use 
>> those information,making my life a bit easier... :)
>>     
>
> I do not see a clean, official way right now. It would definitely be
> something you have to obtain via vma_area_struct or something that's
> contained in it. The information is likely there - somewhere. But I
> doubt that obtaining it would make your code very portable across
> different kernel versions.
>   
Ok, don't worry Jan. I was wondering if there was a portable easy way of 
obtaining those data, like a member of vma struct, but if not, there is 
no problem. I'll include these values in the private data struct.

Rodrigo.


		
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