From: "Stephen C. Tweedie" <sct@redhat.com>
To: Timur Tabi <ttabi@interactivesi.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: ioremap_nocache problem?
Date: Thu, 25 Jan 2001 15:16:55 +0000 [thread overview]
Message-ID: <20010125151655.V11607@redhat.com> (raw)
In-Reply-To: <3A6D5D28.C132D416@sangate.com> <20010123165117Z131182-221+34@kanga.kvack.org>
In-Reply-To: <20010123165117Z131182-221+34@kanga.kvack.org>; from ttabi@interactivesi.com on Tue, Jan 23, 2001 at 10:53:51AM -0600
Hi,
On Tue, Jan 23, 2001 at 10:53:51AM -0600, Timur Tabi wrote:
>
> My problem is that it's very easy to map memory with ioremap_nocache, but if
> you use iounmap() the un-map it, the entire system will crash. No one has been
> able to explain that one to me, either.
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.
Cheers,
Stephen
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WARNING: multiple messages have this Message-ID (diff)
From: "Stephen C. Tweedie" <sct@redhat.com>
To: Timur Tabi <ttabi@interactivesi.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: ioremap_nocache problem?
Date: Thu, 25 Jan 2001 15:16:55 +0000 [thread overview]
Message-ID: <20010125151655.V11607@redhat.com> (raw)
In-Reply-To: <20010123165117Z131182-221+34@kanga.kvack.org>; from ttabi@interactivesi.com on Tue, Jan 23, 2001 at 10:53:51AM -0600
Hi,
On Tue, Jan 23, 2001 at 10:53:51AM -0600, Timur Tabi wrote:
>
> My problem is that it's very easy to map memory with ioremap_nocache, but if
> you use iounmap() the un-map it, the entire system will crash. No one has been
> able to explain that one to me, either.
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.
Cheers,
Stephen
--
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.eu.org/Linux-MM/
next prev parent reply other threads:[~2001-01-25 15:19 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-23 10:30 ioremap_nocache problem? Mark Mokryn
2001-01-23 10:30 ` Mark Mokryn
2001-01-23 16:53 ` Timur Tabi
2001-01-23 16:53 ` Timur Tabi
2001-01-25 15:16 ` Stephen C. Tweedie [this message]
2001-01-25 15:16 ` Stephen C. Tweedie
2001-01-25 15:56 ` Timur Tabi
2001-01-25 16:44 ` Roman Zippel
2001-01-25 16:44 ` Roman Zippel
2001-01-25 16:49 ` Timur Tabi
2001-01-26 10:39 ` Stephen C. Tweedie
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 17:04 ` Jeff Hartmann
2001-01-25 17:11 ` Timur Tabi
2001-01-25 17:11 ` Timur Tabi
[not found] ` <E14LpvQ-0008Pw-00@mail.valinux.com>
2001-01-25 17:47 ` Jeff Hartmann
2001-01-25 17:47 ` Jeff Hartmann
2001-01-25 17:53 ` Timur Tabi
2001-01-26 10:43 ` Stephen C. Tweedie
2001-01-26 10:43 ` Stephen C. Tweedie
2001-01-26 16:32 ` Eric W. Biederman
2001-01-26 19:22 ` Timur Tabi
2001-01-25 17:53 ` Timur Tabi
2001-01-25 18:13 ` Jeff Hartmann
2001-01-25 18:13 ` Jeff Hartmann
2001-01-25 18:18 ` Timur Tabi
2001-01-25 18:18 ` Timur Tabi
[not found] ` <E14Lqyt-0003z6-00@mail.valinux.com>
2001-01-25 18:46 ` Jeff Hartmann
2001-01-25 18:46 ` Jeff Hartmann
[not found] ` <200101251556.f0PFuPd01743@mail.redhat.com>
2001-01-26 10:37 ` Stephen C. Tweedie
2001-01-26 10:37 ` Stephen C. Tweedie
2001-01-25 15:56 ` Timur Tabi
2001-01-23 18:12 ` Roman Zippel
2001-01-23 18:12 ` Roman Zippel
2001-01-23 18:38 ` Timur Tabi
2001-01-24 0:50 ` David Wragg
2001-01-24 0:50 ` David Wragg, David Wragg
2001-01-24 15:14 ` Timur Tabi
2001-01-24 15:14 ` Timur Tabi
[not found] ` <E14LRce-0008FU-00@diver.doc.ic.ac.uk>
2001-01-24 15:39 ` David Wragg
2001-01-24 15:39 ` David Wragg
2001-01-23 18:38 ` Timur Tabi
2001-01-24 1:01 ` David Wragg
2001-01-24 1:01 ` David Wragg
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