From: Timur Tabi <ttabi@interactivesi.com>
To: Linux Kernel Mailing list <linux-kernel@vger.kernel.org>
Subject: Should page->count ever be -1?
Date: Wed, 3 Jan 2001 15:07:03 -0600 [thread overview]
Message-ID: <20010103210714Z129267-457+17@vger.kernel.org> (raw)
I'm experiencing some kind of memory leaks playing with ioremap and iounmap,
and I've narrowed down the problem to iounmap refusing to unmap the memory that
I just mapped. The line of code in question is
if (!PageReserved(page) && atomic_dec_and_test(&page->count)) {
from page_alloc.c (this is 2.2.18pre15). It appears that page->count is
already zero when this code is executed, and after it's executed, page->count
becomes -1 (or more accurately, 0xFFFFFFFF). Is this acceptable, or is it an
error condition?
--
Timur Tabi - ttabi@interactivesi.com
Interactive Silicon - http://www.interactivesi.com
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next reply other threads:[~2001-01-03 21:07 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-03 21:07 Timur Tabi [this message]
2001-01-03 21:55 ` Should page->count ever be -1? Andrea Arcangeli
2001-01-03 21:59 ` Timur Tabi
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