linux-kernel - [Part1 PATCH v5 15/22] x86, mm, numa: Move node_possible

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Date:	Thu, 13 Jun 2013 21:03:02 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	tglx@...utronix.de, mingo@...e.hu, hpa@...or.com,
	akpm@...ux-foundation.org, tj@...nel.org, trenn@...e.de,
	yinghai@...nel.org, jiang.liu@...wei.com, wency@...fujitsu.com,
	laijs@...fujitsu.com, isimatu.yasuaki@...fujitsu.com,
	mgorman@...e.de, minchan@...nel.org, mina86@...a86.com,
	gong.chen@...ux.intel.com, vasilis.liaskovitis@...fitbricks.com,
	lwoodman@...hat.com, riel@...hat.com, jweiner@...hat.com,
	prarit@...hat.com
Cc:	x86@...nel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: [Part1 PATCH v5 15/22] x86, mm, numa: Move node_possible_map setting later

From: Yinghai Lu <yinghai@...nel.org>

Move node_possible_map handling out of numa_check_memblks()
to avoid side effect when changing numa_check_memblks().

Only set node_possible_map once for successful path instead
of resetting in numa_init() every time.

Suggested-by: Tejun Heo <tj@...nel.org>
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
Reviewed-by: Tang Chen <tangchen@...fujitsu.com>
Tested-by: Tang Chen <tangchen@...fujitsu.com>
---
 arch/x86/mm/numa.c |   11 +++++++----
 1 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index e448b6f..da2ebab 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -536,12 +536,13 @@ static unsigned long __init node_map_pfn_alignment(struct numa_meminfo *mi)
 
 static int __init numa_check_memblks(struct numa_meminfo *mi)
 {
+	nodemask_t nodes_parsed;
 	unsigned long pfn_align;
 
 	/* Account for nodes with cpus and no memory */
-	node_possible_map = numa_nodes_parsed;
-	numa_nodemask_from_meminfo(&node_possible_map, mi);
-	if (WARN_ON(nodes_empty(node_possible_map)))
+	nodes_parsed = numa_nodes_parsed;
+	numa_nodemask_from_meminfo(&nodes_parsed, mi);
+	if (WARN_ON(nodes_empty(nodes_parsed)))
 		return -EINVAL;
 
 	if (!numa_meminfo_cover_memory(mi))
@@ -593,7 +594,6 @@ static int __init numa_init(int (*init_func)(void))
 		set_apicid_to_node(i, NUMA_NO_NODE);
 
 	nodes_clear(numa_nodes_parsed);
-	nodes_clear(node_possible_map);
 	memset(&numa_meminfo, 0, sizeof(numa_meminfo));
 	numa_reset_distance();
 
@@ -669,6 +669,9 @@ void __init x86_numa_init(void)
 
 	early_x86_numa_init();
 
+	node_possible_map = numa_nodes_parsed;
+	numa_nodemask_from_meminfo(&node_possible_map, mi);
+
 	for (i = 0; i < mi->nr_blks; i++) {
 		struct numa_memblk *mb = &mi->blk[i];
 		memblock_set_node(mb->start, mb->end - mb->start, mb->nid);
-- 
1.7.1

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