From: "Stephen C. Tweedie" <sct@redhat.com>
To: Timur Tabi <ttabi@interactivesi.com>
Cc: "Stephen C. Tweedie" <sct@redhat.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: ioremap_nocache problem?
Date: Fri, 26 Jan 2001 10:37:14 +0000 [thread overview]
Message-ID: <20010126103714.B11607@redhat.com> (raw)
In-Reply-To: <3A6D5D28.C132D416@sangate.com> <20010123165117Z131182-221+34@kanga.kvack.org> <20010123165117Z131182-221+34@kanga.kvack.org> <20010125151655.V11607@redhat.com> <200101251556.f0PFuPd01743@mail.redhat.com>
In-Reply-To: <200101251556.f0PFuPd01743@mail.redhat.com>; from ttabi@interactivesi.com on Thu, Jan 25, 2001 at 09:56:32AM -0600
Hi,
On Thu, Jan 25, 2001 at 09:56:32AM -0600, Timur Tabi wrote:
> > ioremap*() is only supposed to be used on IO regions or reserved
> > pages. If you haven't marked the pages as reserved, then iounmap will
> > do the wrong thing, so it's up to you to reserve the pages.
>
> Au contraire!
>
> I mark the page as reserved when I ioremap() it. However, if I leave it marked
> reserved, then iounmap() will not unmap it.
It certainly should do, and the 2.4 source certainly looks as if it
does. At least on i386, iounmap calls vfree, which ends up in
free_area_pte(), which will unconditionally clear the pte (hence
unmapping the page).
Cheers,
Stephen
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/
next prev parent reply other threads:[~2001-01-26 10:40 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-23 10:30 ioremap_nocache problem? Mark Mokryn
2001-01-23 16:53 ` Timur Tabi
2001-01-23 18:12 ` Roman Zippel
2001-01-24 0:50 ` David Wragg
2001-01-24 15:14 ` Timur Tabi
[not found] ` <E14LRce-0008FU-00@diver.doc.ic.ac.uk>
2001-01-24 15:39 ` David Wragg
2001-01-23 18:38 ` Timur Tabi
2001-01-24 1:01 ` David Wragg
[not found] ` <20010123165117Z131182-221+34@kanga.kvack.org>
2001-01-25 15:16 ` Stephen C. Tweedie
[not found] ` <200101251556.f0PFuPd01743@mail.redhat.com>
2001-01-26 10:37 ` Stephen C. Tweedie [this message]
2001-01-25 15:56 ` Timur Tabi
[not found] ` <20010125155345Z131181-221+38@kanga.kvack.org>
2001-01-25 16:44 ` Roman Zippel
[not found] ` <20010125164707Z131181-222+39@kanga.kvack.org>
2001-01-26 10:39 ` Stephen C. Tweedie
2001-01-25 16:49 ` Timur Tabi
2001-01-25 17:04 ` Jeff Hartmann
2001-01-25 17:11 ` Timur Tabi
[not found] ` <E14LpvQ-0008Pw-00@mail.valinux.com>
2001-01-25 17:47 ` Jeff Hartmann
[not found] ` <20010125175027Z131219-222+40@kanga.kvack.org>
2001-01-26 10:43 ` Stephen C. Tweedie
2001-01-25 17:53 ` Timur Tabi
2001-01-25 18:13 ` Jeff Hartmann
2001-01-25 18:18 ` Timur Tabi
[not found] ` <E14Lqyt-0003z6-00@mail.valinux.com>
2001-01-25 18:46 ` Jeff Hartmann
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=20010126103714.B11607@redhat.com \
--to=sct@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=ttabi@interactivesi.com \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox