From: Andrew Morton <akpm@linux-foundation.org>
To: Russ Anderson <rja@sgi.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Yinghai Lu <yinghai@kernel.org>,
David Miller <davem@davemloft.net>
Subject: Re: [patch] mm: nobootmem: fix sign extend problem in __free_pages_memory()
Date: Mon, 7 May 2012 14:32:18 -0700 [thread overview]
Message-ID: <20120507143218.e8cc5584.akpm@linux-foundation.org> (raw)
In-Reply-To: <20120507193202.GA11518@sgi.com>
On Mon, 7 May 2012 14:32:03 -0500
Russ Anderson <rja@sgi.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@sgi.com) for assistance tracking
> this down.
>
I added the Cc: <stable@vger.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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WARNING: multiple messages have this Message-ID (diff)
From: Andrew Morton <akpm@linux-foundation.org>
To: Russ Anderson <rja@sgi.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Yinghai Lu <yinghai@kernel.org>,
David Miller <davem@davemloft.net>
Subject: Re: [patch] mm: nobootmem: fix sign extend problem in __free_pages_memory()
Date: Mon, 7 May 2012 14:32:18 -0700 [thread overview]
Message-ID: <20120507143218.e8cc5584.akpm@linux-foundation.org> (raw)
In-Reply-To: <20120507193202.GA11518@sgi.com>
On Mon, 7 May 2012 14:32:03 -0500
Russ Anderson <rja@sgi.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@sgi.com) for assistance tracking
> this down.
>
I added the Cc: <stable@vger.kernel.org> to this. The fix is small and
safe and someone might want to run older kernels on such a machine.
next prev parent reply other threads:[~2012-05-07 21:32 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-07 19:32 [patch] mm: nobootmem: fix sign extend problem in __free_pages_memory() Russ Anderson
2012-05-07 19:32 ` Russ Anderson
2012-05-07 21:32 ` Andrew Morton [this message]
2012-05-07 21:32 ` Andrew Morton
2012-05-08 20:16 ` Yinghai Lu
2012-05-08 20:16 ` Yinghai Lu
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