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From: Adam Litke <agl@us.ibm.com>
To: Andy Whitcroft <apw@shadowen.org>
Cc: Andrew Morton <akpm@osdl.org>,
Nishanth Aravamudan <nacc@us.ibm.com>,
William Irwin <wli@holomorphy.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] hugetlb: ensure we do not reference a surplus page after handing it to buddy
Date: Tue, 19 Feb 2008 12:41:51 -0600 [thread overview]
Message-ID: <1203446512.11987.36.camel@localhost.localdomain> (raw)
In-Reply-To: <1203445688.0@pinky>
Indeed. I'll take credit for this thinko...
On Tue, 2008-02-19 at 18:28 +0000, Andy Whitcroft wrote:
> When we free a page via free_huge_page and we detect that we are in
> surplus the page will be returned to the buddy. After this we no longer
> own the page. However at the end free_huge_page we clear out our mapping
> pointer from page private. Even where the page is not a surplus we
> free the page to the hugepage pool, drop the pool locks and then clear
> page private. In either case the page may have been reallocated. BAD.
>
> Make sure we clear out page private before we free the page.
>
> Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Acked-by: Adam Litke <agl@us.ibm.com>
--
Adam Litke - (agl at us.ibm.com)
IBM Linux Technology Center
next prev parent reply other threads:[~2008-02-19 18:35 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-19 18:28 Andy Whitcroft
2008-02-19 18:41 ` Adam Litke [this message]
2008-02-19 23:30 ` Andrew Morton
2008-02-20 14:59 ` Adam Litke
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