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From: "Amir Hermelin" <amir@montilio.com>
To: <linux-kernel@vger.kernel.org>
Subject: PG_reserved bug
Date: Wed, 26 Nov 2003 12:09:58 +0200	[thread overview]
Message-ID: <001501c3b405$75d49c90$1d01a8c0@CARTMAN> (raw)

Hi,
I've found a bug in the 2.4.20 kernel (might have appeared before), that if
the PG_reserved flag is set on a page, its reference count will be
incremented but won't be decremented.  This is due to the wrong order of
lazy if tests in __free_pages().

I have two questions:
1.  How do I report it?  I found no maintainer for MM in MAINTAINERS
2.  I'm writing a module that gets pages (via __get_free_pages) and holds
them throughout its lifetime.  Where must I check if this page can be taken
from under me, without using the reserved bit?  In other words, if I want to
make sure the behavior is the same with or without the reserved bit, what
must I maintain?

Thanks,
Amir.



             reply	other threads:[~2003-11-26 10:10 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-11-26 10:09 Amir Hermelin [this message]
2003-11-26 10:17 ` PG_reserved bug William Lee Irwin III
2003-11-26 12:45   ` Amir Hermelin
2003-11-26 12:50     ` William Lee Irwin III
2003-11-26 13:07       ` Amir Hermelin
2003-11-26 13:09         ` William Lee Irwin III

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