linux-kernel - Re: mmotm: mm-slub-optimize-alloc-free-fastpath-by-removing-preemption-on-off.patch is causing preemptible splats

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Message-ID: <20150121141138.GC23700@dhcp22.suse.cz>
Date:	Wed, 21 Jan 2015 15:11:38 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Krzysztof Kozłowski <k.kozlowski.k@...il.com>
Cc:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Christoph Lameter <cl@...ux.com>,
	Jesper Dangaard Brouer <brouer@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: mmotm:
 mm-slub-optimize-alloc-free-fastpath-by-removing-preemption-on-off.patch is
 causing preemptible splats

On Wed 21-01-15 15:06:03, Krzysztof Kozłowski wrote:
[...]
> Same here :) [1] . So actually only ARM seems affected (both armv7 and
> armv8) because it is the only one which uses smp_processor_id() in
> my_cpu_offset.

This was on x86_64 with CONFIG_DEBUG_PREEMPT so it is not only ARM
specific.
 
> [1] https://lkml.org/lkml/2015/1/20/162

Sorry, have missed this post.
-- 
Michal Hocko
SUSE Labs
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