linux-kernel - Re: [PATCH] mm: page allocator: Silence build_all

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Message-ID: <20110323103836.GC6802@csn.ul.ie>
Date:	Wed, 23 Mar 2011 10:38:36 +0000
From:	Mel Gorman <mel@....ul.ie>
To:	Paul Mundt <lethal@...ux-sh.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: page allocator: Silence build_all_zonelists()
 section mismatch.

On Tue, Mar 22, 2011 at 10:30:45PM +0900, Paul Mundt wrote:
> The memory hotplug case involves calling to build_all_zonelists() which
> in turns calls in to setup_zone_pageset(). The latter is marked
> __meminit while build_all_zonelists() itself has no particular
> annotation. build_all_zonelists() is only handed a non-NULL pointer in
> the case of memory hotplug through an existing __meminit path, so the
> setup_zone_pageset() reference is always safe.
> 
> The options as such are either to flag build_all_zonelists() as __ref (as
> per __build_all_zonelists()), or to simply discard the __meminit
> annotation from setup_zone_pageset().
> 
> Signed-off-by: Paul Mundt <lethal@...ux-sh.org>
> 
> ---
> 
> While discarding the __meminit annotation from setup_zone_pageset() is
> probably cleanest I expected some people would take issue with this so
> opted for the more visually offensive __ref route. I can resend for the
> other way if people prefer, or someone else can do it given that it's a
> trivial change.
> 
>  mm/page_alloc.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 

Discarding __meminit from setup_zone_pageset() would unnecessarily grow
the kernel image in the !HOTPLUG case and setting __meminit on
build_all_zonelists() looks like it would just cause other section
mistmatch warnings so;

Acked-by: Mel Gorman <mel@....ul.ie>
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