linux-kernel - Re: [linux-next][PATCH] mm: slub: work around unneeded lockdep warning

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Message-ID: <alpine.DEB.2.02.1401252041120.10325@chino.kir.corp.google.com>
Date:	Sat, 25 Jan 2014 20:41:41 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Dave Hansen <dave@...1.net>
cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	peterz@...radead.org, penberg@...nel.org, linux@....linux.org.uk
Subject: Re: [linux-next][PATCH] mm: slub: work around unneeded lockdep
 warning

On Fri, 24 Jan 2014, Dave Hansen wrote:

> From: Dave Hansen <dave.hansen@...ux.intel.com>
> 
> The slub code does some setup during early boot in
> early_kmem_cache_node_alloc() with some local data.  There is no
> possible way that another CPU can see this data, so the slub code
> doesn't unnecessarily lock it.  However, some new lockdep asserts
> check to make sure that add_partial() _always_ has the list_lock
> held.
> 
> Just add the locking, even though it is technically unnecessary.
> 
> Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Pekka Enberg <penberg@...nel.org>
> Cc: Russell King <linux@....linux.org.uk>

Acked-by: David Rientjes <rientjes@...gle.com>
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