linux-kernel - [PATCH] mm: clear N_HIGH_MEMORY map before se set it again -v4

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Date:	Thu, 04 Jun 2009 10:26:41 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Christoph Lameter <cl@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>, mingo@...e.hu,
	mel@....ul.ie
CC:	tglx@...utronix.de, hpa@...or.com, suresh.b.siddha@...el.com,
	linux-kernel@...r.kernel.org, viro@...iv.linux.org.uk,
	rusty@...tcorp.com.au, steiner@....com, rientjes@...gle.com
Subject: [PATCH] mm: clear N_HIGH_MEMORY map before se set it again -v4


SRAT tables may contains nodes of very small size. The arch code may
decide to not activate such a node. However, currently the early boot code
sets N_HIGH_MEMORY for such nodes. These nodes therefore seem to be active
although these nodes have no present pages.

for 64bit N_HIGH_MEMORY == N_NORMAL_MEMORY, so that works for 64 bit too

v4: update description according to Christoph

Signed-off-by: Yinghai Lu <Yinghai@...nel.org>
Tested-by: Jack Steiner <steiner@....com>
Acked-by: Christoph Lameter <cl@...ux-foundation.org>

---
 mm/page_alloc.c |    5 +++++
 1 file changed, 5 insertions(+)

Index: linux-2.6/mm/page_alloc.c
===================================================================
--- linux-2.6.orig/mm/page_alloc.c
+++ linux-2.6/mm/page_alloc.c
@@ -4041,6 +4041,11 @@ void __init free_area_init_nodes(unsigne
 						early_node_map[i].start_pfn,
 						early_node_map[i].end_pfn);
 
+	/*
+	 * find_zone_movable_pfns_for_nodes/early_calculate_totalpages init
+	 * that node_mask, clear it at first
+	 */
+	nodes_clear(node_states[N_HIGH_MEMORY]);
 	/* Initialise every node */
 	mminit_verify_pageflags_layout();
 	setup_nr_node_ids();
--
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