netdev - Re: [Bugme-new] [Bug 33502] New: Caught 64-bit read from uninitialized memory in __alloc

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Message-ID: <4DC90F23.7090009@cs.helsinki.fi>
Date:	Tue, 10 May 2011 13:10:43 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Christoph Lameter <cl@...ux.com>, casteyde.christian@...e.fr,
	Andrew Morton <akpm@...ux-foundation.org>,
	netdev@...r.kernel.org, bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.org,
	Vegard Nossum <vegardno@....uio.no>
Subject: Re: [Bugme-new] [Bug 33502] New: Caught 64-bit read from uninitialized
 memory in __alloc_skb

Hi Eric,

On 5/10/11 1:03 PM, Eric Dumazet wrote:
> What I meant is I dont understand how Christoph expect to solve this
> problem if irqsafe_cpu_cmpxchg_double() is used everywhere.

Do you see any problem with annotating the freelist pointers with 
kmemcheck_mark_initialized() in set_freepointer()?

The #ifdef removal was requested by Linus et al when we fixed a bug that 
was causing problems during boot on certain CPUs. So even though it 
invalidates your fix, it's the way to go forward.

			Pekka
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