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From: Adam Litke <>
To: Andy Whitcroft <>
Cc: Andrew Morton <>,
	Nishanth Aravamudan <>,
	William Irwin <>,,
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 <>

Acked-by: Adam Litke <>

Adam Litke - (agl at
IBM Linux Technology Center

  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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