From: "Francis Moreau" <francis.moro@gmail.com>
To: "Lennart Sorensen" <lsorense@csclub.uwaterloo.ca>
Cc: linux-kernel@vger.kernel.org
Subject: Re: How to avoid data copies in a driver ?
Date: Fri, 16 May 2008 22:17:46 +0200 [thread overview]
Message-ID: <38b2ab8a0805161317i161e6b12w60ae21b4727de6ea@mail.gmail.com> (raw)
In-Reply-To: <20080515135901.GX7577@csclub.uwaterloo.ca>
On Thu, May 15, 2008 at 3:59 PM, Lennart Sorensen
<lsorense@csclub.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
next prev parent reply other threads:[~2008-05-16 20:18 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-14 19:54 Francis Moreau
2008-05-14 20:02 ` Lennart Sorensen
2008-05-15 7:44 ` Francis Moreau
2008-05-15 13:59 ` Lennart Sorensen
2008-05-16 20:17 ` Francis Moreau [this message]
2008-05-14 21:23 ` linux-os (Dick Johnson)
2008-05-15 7:40 ` Francis Moreau
2008-05-15 11:50 ` Arnd Hannemann
2008-05-15 12:08 ` Francis Moreau
2008-05-15 13:16 ` linux-os (Dick Johnson)
2008-05-16 8:10 ` Jeremy Fitzhardinge
2008-05-16 11:44 ` Francis Moreau
2008-05-21 10:41 ` Pavel Machek
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