From: Timur Tabi <ttabi@interactivesi.com>
To: Linux Kernel Mailing list <linux-kernel@vger.kernel.org>,
Linux MM mailing list <linux-mm@kvack.org>
Subject: kernel BUG at page_alloc.c:85 (iounmap)
Date: Fri, 22 Sep 2000 18:11:25 -0500 [thread overview]
Message-ID: <20000922230543Z131169-10809+23@kanga.kvack.org> (raw)
I have a driver which calls marks a physical page as PG_Reserved, calls
ioremap_nocache() on it, performs a non-destructive memory write, and then
calls iounmap(). I have a recurring problem which I can't figure out. After
28 such map/unmap calls, I get an error in page_alloc.c on line 85. This is
with 2.4.0-test2. The offending line is in function __free_pages_ok:
if (page->buffers)
BUG();
My guess is that the page I'm trying to map with iounmap() has a non-zero value
of buffers before I map it, but ioremap() doesn't care about that. But when I
go to iounmap it, then it checks buffers and complains.
Is this correct? And if so, what does 'buffers' do?
--
Timur Tabi - ttabi@interactivesi.com
Interactive Silicon - http://www.interactivesi.com
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reply other threads:[~2000-09-22 23:11 UTC|newest]
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