linux-kernel - Re: How to avoid data copies in a driver ?

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Message-ID: <38b2ab8a0805161317i161e6b12w60ae21b4727de6ea@mail.gmail.com>
Date:	Fri, 16 May 2008 22:17:46 +0200
From:	"Francis Moreau" <francis.moro@...il.com>
To:	"Lennart Sorensen" <lsorense@...lub.uwaterloo.ca>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: How to avoid data copies in a driver ?

On Thu, May 15, 2008 at 3:59 PM, Lennart Sorensen
<lsorense@...lub.uwaterloo.ca> 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.

-- 
Francis
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