linux-kernel - Re: m(un)map kmalloc buffers to userspace

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Message-ID: <20151210114005.GF19496@dhcp22.suse.cz>
Date:	Thu, 10 Dec 2015 12:40:05 +0100
From:	Michal Hocko <mhocko@...nel.org>
To:	Sebastian Frias <sebastian_frias@...madesigns.com>
Cc:	Marc Gonzalez <marc_gonzalez@...madesigns.com>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: m(un)map kmalloc buffers to userspace

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)
-- 
Michal Hocko
SUSE Labs
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