Re: How to avoid data copies in a driver ?

From: Francis Moreau
Date: Fri May 16 2008 - 16:18:05 EST

On Thu, May 15, 2008 at 3:59 PM, Lennart Sorensen
<lsorense@xxxxxxxxxxxxxxxxxxx> wrote:
> On Thu, May 15, 2008 at 09:44:37AM +0200, Francis Moreau wrote:
>> So I would need to map this pointer into the kernel space, then fill it, take
>> care of cache coherency, unmap the kernel pointer.
>> Do you have any example of that in the kernel tree ?
> I was asking if that would work. Does the to_user and from_user work on
> a pointer from user space if that pointer points at a memory mapped
> file?

I would say yes but I'm not really confident.

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