linux-kernel - [patch] mm: always set nodes with regular memory in N_NORMAL

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Date:	Thu, 21 Apr 2011 14:41:28 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Mel Gorman <mel@....ul.ie>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [patch] mm: always set nodes with regular memory in
 N_NORMAL_MEMORY

N_NORMAL_MEMORY is intended to include all nodes that have present memory 
in regular zones, that is, zones below ZONE_HIGHMEM.  This should be done 
regardless of whether CONFIG_HIGHMEM is set or not.

This fixes ia64 so that the nodes get set appropriately in the nodemask 
for DISCONTIGMEM and mips if it does not enable CONFIG_HIGHMEM even for 
32-bit kernels.

If N_NORMAL_MEMORY is not accurate, slub may encounter errors since it 
relies on this nodemask to setup kmem_cache_node data structures for each 
cache.

Signed-off-by: David Rientjes <rientjes@...gle.com>
---
 mm/page_alloc.c |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4727,7 +4727,6 @@ out:
 /* Any regular memory on that node ? */
 static void check_for_regular_memory(pg_data_t *pgdat)
 {
-#ifdef CONFIG_HIGHMEM
 	enum zone_type zone_type;
 
 	for (zone_type = 0; zone_type <= ZONE_NORMAL; zone_type++) {
@@ -4735,7 +4734,6 @@ static void check_for_regular_memory(pg_data_t *pgdat)
 		if (zone->present_pages)
 			node_set_state(zone_to_nid(zone), N_NORMAL_MEMORY);
 	}
-#endif
 }
 
 /**
--
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