From: David Rientjes <rientjes@google.com>
To: Chris Metcalf <cmetcalf@tilera.com>
Cc: Tejun Heo <tj@kernel.org>,
Christoph Lameter <cl@linux-foundation.org>,
Pekka Enberg <penberg@kernel.org>, Matt Mackall <mpm@selenic.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH] slub: always align cpu_slab to honor cmpxchg_double requirement
Date: Thu, 2 Jun 2011 10:16:31 -0700 (PDT) [thread overview]
Message-ID: <alpine.DEB.2.00.1106021015220.18350@chino.kir.corp.google.com> (raw)
In-Reply-To: <201106021424.p52EO91O006974@lab-17.internal.tilera.com>
On Thu, 2 Jun 2011, Chris Metcalf wrote:
> On an architecture without CMPXCHG_LOCAL but with DEBUG_VM enabled,
> the VM_BUG_ON() in __pcpu_double_call_return_bool() will cause an early
> panic during boot unless we always align cpu_slab properly.
>
> In principle we could remove the alignment-testing VM_BUG_ON() for
> architectures that don't have CMPXCHG_LOCAL, but leaving it in means
> that new code will tend not to break x86 even if it is introduced
> on another platform, and it's low cost to require alignment.
>
> Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Acked-by: David Rientjes <rientjes@google.com>
> ---
> This needs to be pushed for 3.0 to allow arch/tile to boot.
> I'm happy to push it but I assume it would be better coming
> from an mm or percpu tree. Thanks!
>
Should also be marked for stable for 2.6.39.x, right?
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next prev parent reply other threads:[~2011-06-02 17:16 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-02 14:19 Chris Metcalf
2011-06-02 17:16 ` David Rientjes [this message]
2011-06-02 18:13 ` Chris Metcalf
2011-06-03 5:49 ` Pekka Enberg
2011-06-03 14:06 ` Christoph Lameter
2011-06-03 14:33 ` Chris Metcalf
2011-06-03 14:41 ` Christoph Lameter
2011-06-03 18:06 ` Pekka Enberg
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