From: Daniel Drake <ddrake@brontes3d.com>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Johannes Weiner <hannes@saeurebad.de>, linux-mm@kvack.org
Subject: Re: faulting kmalloced buffers into userspace through mmap()
Date: Fri, 06 Jun 2008 22:29:05 +0100 [thread overview]
Message-ID: <4849AC21.5090301@brontes3d.com> (raw)
In-Reply-To: <200806042100.39345.nickpiggin@yahoo.com.au>
Nick Piggin wrote:
> You can map it with a pfn mapping / vm_insert_pfn / remap_pfn_range etc.
> which does not touch the underlying struct pages. You must then ensure
> you deallocate the memory yourself after it is finished with.
Ah, excellent, I wasn't aware of pfn mappings or vm_insert_pfn. I should
have read further than LDD3 :)
I have brushed up the section I wrote earlier:
http://linux-mm.org/DeviceDriverMmap
Hopefully someone else will find it useful.
Since I'm working with 2.6.25 I've implemented a nopfn handler which
works perfectly using vm_insert_pfn(). Thanks for all your great work in
this area!
--
Daniel Drake
Brontes Technologies, A 3M Company
http://www.brontes3d.com/opensource/
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prev parent reply other threads:[~2008-06-06 21:29 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-01 14:40 Daniel Drake
2008-06-02 5:38 ` Johannes Weiner
2008-06-04 9:39 ` Daniel Drake
2008-06-04 11:00 ` Nick Piggin
2008-06-06 21:29 ` Daniel Drake [this message]
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