linux-kernel - Re: [patch] mm: nobootmem: fix sign extend problem in __free_pages

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Message-Id: <20120507143218.e8cc5584.akpm@linux-foundation.org>
Date:	Mon, 7 May 2012 14:32:18 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Russ Anderson <rja@....com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Yinghai Lu <yinghai@...nel.org>,
	David Miller <davem@...emloft.net>
Subject: Re: [patch] mm: nobootmem: fix sign extend problem in
 __free_pages_memory()

On Mon, 7 May 2012 14:32:03 -0500
Russ Anderson <rja@....com> wrote:

> Systems with 8 TBytes of memory or greater can hit a problem 
> where only the the first 8 TB of memory shows up.

erk.

>  This is
> due to "int i" being smaller than "unsigned long start_aligned",
> causing the high bits to be dropped.
> 
> The fix is to change i to unsigned long to match start_aligned
> and end_aligned.
> 
> Thanks to Jack Steiner (steiner@....com) for assistance tracking
> this down.
> 

I added the Cc: <stable@...r.kernel.org> to this.  The fix is small and
safe and someone might want to run older kernels on such a machine.

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