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

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Message-ID: <20110322133045.GA24498@linux-sh.org>
Date:	Tue, 22 Mar 2011 22:30:45 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Mel Gorman <mel@....ul.ie>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH] mm: page allocator: Silence build_all_zonelists() section mismatch.

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(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 7945247..134e0b8 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3110,7 +3110,7 @@ static __init_refok int __build_all_zonelists(void *data)
  * Called with zonelists_mutex held always
  * unless system_state == SYSTEM_BOOTING.
  */
-void build_all_zonelists(void *data)
+void __ref build_all_zonelists(void *data)
 {
 	set_zonelist_order();

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