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/
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
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 faulting kmalloced buffers into userspace through mmap() 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]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4849AC21.5090301@brontes3d.com \
--to=ddrake@brontes3d.com \
--cc=hannes@saeurebad.de \
--cc=linux-mm@kvack.org \
--cc=nickpiggin@yahoo.com.au \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.