RE: Exporting kernel memory to application

RE: Exporting kernel memory to application

[Nitin Dhingra]

You can do that by using kiobuf's ( only in kernel 2.4.x ).
That way you could lock the user buffers in kernel but you 
would have to allocate user buffer prior to using any kiobuf's functions 
like map_user_kiobuf() 

For example you could look at arch/cris/drivers/examples/kiobuftest.c

:),
Nitin


 -----Original Message-----
From: 	Alan Cox [mailto:alan@lxorguk.ukuu.org.uk] 
Sent:	Tuesday, August 07, 2001 4:31 PM
To:	imran.badr@cavium.com
Cc:	linux-kernel@vger.kernel.org
Subject:	Re: Exporting kernel memory to application

> I am in a situation where it is required to export a kernel memory
> (allocated by kmalloc in the device driver) to the user application. I
would
> really appreciate any guidance or suggestion.

Look at the sound drivers, they do this, although with memory allocated
by get_free_pages() - the rest of the theory is the same
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Re: Exporting kernel memory to application

[Andreas Bombe]

On Wed, Aug 08, 2001 at 03:48:50PM +0530, Nitin Dhingra wrote:
> You can do that by using kiobuf's ( only in kernel 2.4.x ).
> That way you could lock the user buffers in kernel but you 
> would have to allocate user buffer prior to using any kiobuf's functions 
> like map_user_kiobuf() 

When someone asks how to lock user buffers into kernel space they are
suggested to allocate the buffers in kernel and map them to user space
which is much cleaner, safer and everything.

That guy got it right on the first attempt.  Don't confuse him with
inferior solutions.

-- 
Andreas E. Bombe <andreas.bombe@munich.netsurf.de>    DSA key 0x04880A44

Re: Exporting kernel memory to application

[Alan Cox]

> I am in a situation where it is required to export a kernel memory
> (allocated by kmalloc in the device driver) to the user application. I would
> really appreciate any guidance or suggestion.

Look at the sound drivers, they do this, although with memory allocated
by get_free_pages() - the rest of the theory is the same

Exporting kernel memory to application

[Imran Badr]

Hi,

I am in a situation where it is required to export a kernel memory
(allocated by kmalloc in the device driver) to the user application. I would
really appreciate any guidance or suggestion.

Thanks,
Imran Badr.