From: Richard Weinberger <richard.weinberger@gmail.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: Sebastian Frias <sebastian_frias@sigmadesigns.com>,
Marc Gonzalez <marc_gonzalez@sigmadesigns.com>,
linux-mm <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: m(un)map kmalloc buffers to userspace
Date: Thu, 10 Dec 2015 13:04:48 +0100 [thread overview]
Message-ID: <CAFLxGvy7z5zo1_9QfYZj1AMLN-+iVnErir_U7=5=y2bRFKHhNQ@mail.gmail.com> (raw)
In-Reply-To: <20151210114005.GF19496@dhcp22.suse.cz>
On Thu, Dec 10, 2015 at 12:40 PM, Michal Hocko <mhocko@kernel.org> wrote:
> On Wed 09-12-15 16:35:53, Sebastian Frias wrote:
> [...]
>> We've seen that drivers/media/pci/zoran/zoran_driver.c for example seems to
>> be doing as us kmalloc+remap_pfn_range,
>
> This driver is broken - I will post a patch.
>
>> is there any guarantee (or at least an advised heuristic) to determine
>> if a driver is "current" (ie: uses the latest APIs and works)?
>
> OK, it seems I was overly optimistic when directing you to existing
> drivers. Sorry about that I wasn't aware you could find such a terrible
> code there. Please refer to Linux Device Drivers book which should give
> you a much better lead (e.g. http://www.makelinux.net/ldd3/chp-15-sect-2)
Also consider using UIO.
--
Thanks,
//richard
next prev parent reply other threads:[~2015-12-10 12:04 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-08 17:25 m(un)map kmalloc buffers to userspace Sebastian Frias
2015-12-09 13:55 ` Michal Hocko
2015-12-09 14:07 ` Marc Gonzalez
2015-12-09 14:32 ` Michal Hocko
2015-12-09 14:53 ` Sebastian Frias
2015-12-09 15:12 ` Michal Hocko
2015-12-09 15:35 ` Sebastian Frias
2015-12-10 11:40 ` Michal Hocko
2015-12-10 12:04 ` Richard Weinberger [this message]
2015-12-10 13:37 ` Sebastian Frias
2015-12-10 14:06 ` Michal Hocko
2015-12-10 16:48 ` Sebastian Frias
2015-12-11 9:42 ` Michal Hocko
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