linux-kernel - [tip:x86/mm] x86, mm, numa: Move node_possible

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Message-ID: <tip-052f56f9b1ffa4b1d1fffb7beb43511e0c630305@git.kernel.org>
Date:	Fri, 14 Jun 2013 14:32:59 -0700
From:	tip-bot for Yinghai Lu <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	yinghai@...nel.org, tj@...nel.org, tangchen@...fujitsu.com,
	tglx@...utronix.de, hpa@...ux.intel.com
Subject: [tip:x86/mm] x86, mm, numa: Move node_possible_map setting later

Commit-ID:  052f56f9b1ffa4b1d1fffb7beb43511e0c630305
Gitweb:     http://git.kernel.org/tip/052f56f9b1ffa4b1d1fffb7beb43511e0c630305
Author:     Yinghai Lu <yinghai@...nel.org>
AuthorDate: Thu, 13 Jun 2013 21:03:02 +0800
Committer:  H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Fri, 14 Jun 2013 14:05:03 -0700

x86, mm, numa: Move node_possible_map setting later

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>
Link: http://lkml.kernel.org/r/1371128589-8953-16-git-send-email-tangchen@cn.fujitsu.com
Reviewed-by: Tang Chen <tangchen@...fujitsu.com>
Tested-by: Tang Chen <tangchen@...fujitsu.com>
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
---
 arch/x86/mm/numa.c | 11 +++++++----
 1 file 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);
--
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