From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Timur Tabi <ttabi@interactivesi.com>
Cc: Linux Kernel Mailing list <linux-kernel@vger.kernel.org>,
Linux MM mailing list <linux-mm@kvack.org>
Subject: Re: iounmap() - can't always unmap memory I've mappedt
Date: Fri, 29 Sep 2000 23:00:16 +0100 (BST) [thread overview]
Message-ID: <E13f8CX-0001g1-00@the-village.bc.nu> (raw)
In-Reply-To: <20000929221109Z129234-481+1111@vger.kernel.org> from "Timur Tabi" at Sep 29, 2000 04:56:00 PM
> "num_pages" is usually just equal to 1. This code appears to work very well.
> However, when I call the iounmap function on the memory obtained via
> ioremap_nocache, sometimes I hit a kernel BUG(). The code which causes the bug
> is in page_alloc.c, line 85 (in function __free_pages_ok):
>
> if (page->buffers)
> BUG();
This sounds like you are trying to do maps on pages that are in use. No can do
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next parent reply other threads:[~2000-09-29 22:00 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20000929221109Z129234-481+1111@vger.kernel.org>
2000-09-29 22:00 ` Alan Cox [this message]
2000-09-29 22:12 ` Timur Tabi
[not found] <20000929222813Z129135-481+1113@vger.kernel.org>
2000-09-29 23:24 ` Alan Cox
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