From: Timur Tabi <ttabi@interactivesi.com>
To: "Stephen C. Tweedie" <sct@redhat.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: ioremap_nocache problem?
Date: Thu, 25 Jan 2001 09:56:32 -0600 [thread overview]
Message-ID: <20010125155345Z131181-221+38@kanga.kvack.org> (raw)
In-Reply-To: <20010125151655.V11607@redhat.com>
** Reply to message from "Stephen C. Tweedie" <sct@redhat.com> on Thu, 25 Jan
2001 15:16:55 +0000
> 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. If I mark it "unreserved" (i.e.
reset the reserved bit), then iounmap will unmap it, but it will decrement the
page counter to -1 and the whole system will crash soon thereafter.
I've been asking about this problem for months, but no one has bothered to help
me out.
--
Timur Tabi - ttabi@interactivesi.com
Interactive Silicon - http://www.interactivesi.com
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next prev parent reply other threads:[~2001-01-25 15:56 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-23 10:30 Mark Mokryn
2001-01-23 16:53 ` Timur Tabi
2001-01-25 15:16 ` Stephen C. Tweedie
2001-01-25 15:56 ` Timur Tabi [this message]
2001-01-25 16:44 ` Roman Zippel
2001-01-25 16:49 ` Timur Tabi
2001-01-26 10:39 ` Stephen C. Tweedie
[not found] ` <20010125165001Z132264-460+11@vger.kernel.org>
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
2001-01-25 17:53 ` Timur Tabi
2001-01-26 10:43 ` Stephen C. Tweedie
2001-01-26 16:32 ` Eric W. Biederman
2001-01-26 19:22 ` Timur Tabi
[not found] ` <20010125175308Z130507-460+45@vger.kernel.org>
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
[not found] ` <200101251556.f0PFuPd01743@mail.redhat.com>
2001-01-26 10:37 ` Stephen C. Tweedie
2001-01-23 18:12 ` Roman Zippel
2001-01-23 18:38 ` Timur Tabi
2001-01-24 0:50 ` David Wragg, 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
[not found] ` <20010123183847Z131216-18594+636@vger.kernel.org>
2001-01-24 1:01 ` David Wragg
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