From: William Lee Irwin III <wli@holomorphy.com>
To: Andrew Morton <akpm@osdl.org>
Cc: Andrea Arcangeli <andrea@suse.de>,
linux-kernel@vger.kernel.org, torvalds@osdl.org
Subject: Re: can device drivers return non-ram via vm_ops->nopage?
Date: Sat, 20 Mar 2004 12:50:53 -0800 [thread overview]
Message-ID: <20040320205053.GJ2045@holomorphy.com> (raw)
In-Reply-To: <20040320121345.2a80e6a0.akpm@osdl.org>
On Sat, Mar 20, 2004 at 12:13:45PM -0800, Andrew Morton wrote:
> I agree that ->nopage implementations should not be doing what that driver
> is doing. ->nopage is defined to return a page*: it's crazy to be
> returning someting from there which isn't covered by mem_map[].
> I just don't think it's important enough to be able to cope with
> non-mem_map[] "memory" in do_no_page(), so I agree that requiring ->mmap()
> to synchronously instantiate the pte's and retaining the debug check in
> do_no_page() is a good idea.
There are other reasons for doing it, e.g. unusual TLB attributes
and/or unusual pagetable structures backing the virtual region. I don't
see anyone standing up and screaming for more functionality than cache
coherency and/or disablement now, so as far as I'm concerned,
remap_area_pages() (or rmk's stuff) kills the issue.
-- wli
next prev parent reply other threads:[~2004-03-20 20:51 UTC|newest]
Thread overview: 105+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-20 13:30 can device drivers return non-ram via vm_ops->nopage? Andrea Arcangeli
2004-03-20 14:40 ` William Lee Irwin III
2004-03-20 15:06 ` Andrea Arcangeli
2004-03-20 15:27 ` William Lee Irwin III
2004-03-20 15:44 ` Russell King
2004-03-20 15:57 ` Andrea Arcangeli
2004-03-20 16:15 ` Russell King
2004-03-20 16:25 ` Andrea Arcangeli
2004-03-20 16:57 ` William Lee Irwin III
2004-03-20 17:48 ` Andrea Arcangeli
2004-03-20 19:03 ` Andrea Arcangeli
2004-03-20 15:58 ` Jaroslav Kysela
2004-03-20 16:09 ` Russell King
2004-03-20 19:44 ` Jaroslav Kysela
2004-03-20 22:23 ` Russell King
2004-03-20 22:45 ` William Lee Irwin III
2004-03-20 23:54 ` Russell King
2004-03-21 0:22 ` Zwane Mwaikambo
2004-03-22 4:46 ` Benjamin Herrenschmidt
2004-03-22 18:23 ` Richard Curnow
2004-03-21 0:23 ` William Lee Irwin III
2004-03-21 9:52 ` Arjan van de Ven
2004-03-21 10:39 ` Jaroslav Kysela
2004-03-22 4:43 ` Benjamin Herrenschmidt
2004-03-20 20:13 ` Andrew Morton
2004-03-20 20:28 ` Andrea Arcangeli
2004-03-20 20:50 ` William Lee Irwin III [this message]
2004-03-20 22:26 ` Russell King
2004-03-20 22:45 ` William Lee Irwin III
2004-03-21 20:45 ` David Woodhouse
2004-03-21 20:49 ` Christoph Hellwig
2004-03-21 20:57 ` David Woodhouse
2004-03-21 21:53 ` Linus Torvalds
2004-03-21 22:17 ` Jeff Garzik
2004-03-21 22:23 ` David Woodhouse
2004-03-21 22:23 ` Russell King
2004-03-21 22:34 ` Jeff Garzik
2004-03-21 22:42 ` David Woodhouse
2004-03-21 23:06 ` Jeff Garzik
2004-03-21 22:51 ` Russell King
2004-03-21 23:09 ` Jeff Garzik
2004-03-21 23:11 ` Linus Torvalds
2004-03-21 23:22 ` Jeff Garzik
2004-03-21 23:51 ` Linus Torvalds
2004-03-21 23:58 ` Russell King
2004-03-22 0:34 ` Andrea Arcangeli
2004-03-22 3:05 ` Linus Torvalds
2004-03-23 17:59 ` Andy Whitcroft
2004-03-23 17:58 ` David Woodhouse
2004-03-23 18:11 ` William Lee Irwin III
2004-03-22 0:02 ` David Woodhouse
2004-03-22 3:28 ` Linus Torvalds
2004-03-22 0:10 ` Jeff Garzik
2004-03-22 0:20 ` Russell King
2004-03-22 0:33 ` Jeff Garzik
2004-03-22 4:57 ` Benjamin Herrenschmidt
2004-03-21 23:45 ` Russell King
2004-03-22 0:23 ` William Lee Irwin III
2004-03-22 0:29 ` Jeff Garzik
2004-03-22 1:28 ` William Lee Irwin III
2004-03-22 3:45 ` William Lee Irwin III
2004-03-22 4:41 ` James Bottomley
2004-03-22 4:46 ` William Lee Irwin III
2004-03-22 4:56 ` James Bottomley
2004-03-22 5:26 ` Benjamin Herrenschmidt
2004-03-22 11:58 ` Andrea Arcangeli
2004-03-22 12:05 ` Russell King
2004-03-22 12:34 ` Andrea Arcangeli
2004-03-22 9:30 ` Russell King
2004-03-22 15:04 ` James Bottomley
2004-03-22 15:15 ` Russell King
2004-03-22 15:27 ` James Bottomley
2004-03-22 21:50 ` Benjamin Herrenschmidt
2004-03-22 22:18 ` Jeff Garzik
2004-03-22 22:35 ` William Lee Irwin III
2004-03-22 23:57 ` Benjamin Herrenschmidt
2004-03-23 0:22 ` David Woodhouse
2004-03-23 2:07 ` William Lee Irwin III
2004-03-23 9:28 ` Russell King
2004-03-23 9:34 ` David Woodhouse
2004-03-23 10:04 ` Russell King
2004-03-23 10:05 ` William Lee Irwin III
2004-03-23 11:29 ` Benjamin Herrenschmidt
2004-03-23 11:35 ` Andrea Arcangeli
2004-03-23 11:44 ` William Lee Irwin III
2004-03-23 12:34 ` Andrea Arcangeli
2004-03-23 12:40 ` Russell King
2004-03-23 15:25 ` Linus Torvalds
2004-03-23 15:36 ` Andrea Arcangeli
2004-03-23 15:46 ` Linus Torvalds
2004-03-23 15:50 ` Russell King
2004-03-23 22:10 ` Benjamin Herrenschmidt
2004-03-25 20:25 ` Russell King
2004-03-28 10:17 ` Russell King
2004-03-23 12:49 ` William Lee Irwin III
2004-03-22 23:19 ` Russell King
2004-03-22 23:35 ` Jeff Garzik
2004-03-23 2:26 ` James Bottomley
2004-03-22 6:36 ` William Lee Irwin III
2004-03-20 17:39 ` Linus Torvalds
2004-03-20 17:56 ` Andrea Arcangeli
2004-03-20 18:22 ` William Lee Irwin III
2004-03-21 3:13 ` Chris Wedgwood
2004-03-21 6:23 ` Christoph Hellwig
2004-03-21 7:00 ` Chris Wedgwood
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=20040320205053.GJ2045@holomorphy.com \
--to=wli@holomorphy.com \
--cc=akpm@osdl.org \
--cc=andrea@suse.de \
--cc=linux-kernel@vger.kernel.org \
--cc=torvalds@osdl.org \
/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.