linux-kernel - [PATCH] x86, numa: refactoring numa_register

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Date:	Wed, 16 Feb 2011 12:58:41 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>
CC:	Tejun Heo <tj@...nel.org>, David Rientjes <rientjes@...gle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86, numa: refactoring numa_register_memblks


Don't hide init_memory_mapping and setup_bootmem into that __register__ function

those are really work.

Also We don't need to scan two times for setup_node_bootmem() becase we
are using mapped memblock for node_data already.

let num_register_memblks only take care of register them into early_node_map[]

Signed-off-by: Yinghai Lu <yinghai@...nel.org>

---
 arch/x86/mm/numa_64.c |   47 ++++++++++++++++++++++++++---------------------
 1 file changed, 26 insertions(+), 21 deletions(-)

Index: linux-2.6/arch/x86/mm/numa_64.c
===================================================================
--- linux-2.6.orig/arch/x86/mm/numa_64.c
+++ linux-2.6/arch/x86/mm/numa_64.c
@@ -491,7 +491,7 @@ static bool __init numa_meminfo_cover_me
 
 static int __init numa_register_memblks(struct numa_meminfo *mi)
 {
-	int i, j, nid;
+	int i;
 
 	/* Account for nodes with cpus and no memory */
 	node_possible_map = numa_nodes_parsed;
@@ -515,33 +515,34 @@ static int __init numa_register_memblks(
 	if (!numa_meminfo_cover_memory(mi))
 		return -EINVAL;
 
-	init_memory_mapping_high();
+	return 0;
+}
+
+static void __init setup_numa_bootmem(struct numa_meminfo *mi)
+{
+	int i, nid;
 
 	/*
-	 * Finally register nodes.  Do it twice in case setup_node_bootmem
-	 * missed one due to missing bootmem.
+	 * Do not do that twice, not needed!
+	 *   We are using mapped memblock directly for node data
 	 */
-	for (i = 0; i < 2; i++) {
-		for_each_node_mask(nid, node_possible_map) {
-			u64 start = (u64)max_pfn << PAGE_SHIFT;
-			u64 end = 0;
-
-			if (node_online(nid))
-				continue;
+	for_each_node_mask(nid, node_possible_map) {
+		u64 start = (u64)max_pfn << PAGE_SHIFT;
+		u64 end = 0;
 
-			for (j = 0; j < mi->nr_blks; j++) {
-				if (nid != mi->blk[j].nid)
-					continue;
-				start = min(mi->blk[j].start, start);
-				end = max(mi->blk[j].end, end);
-			}
+		if (node_online(nid))
+			continue;
 
-			if (start < end)
-				setup_node_bootmem(nid, start, end);
+		for (i = 0; i < mi->nr_blks; i++) {
+			if (nid != mi->blk[i].nid)
+				continue;
+			start = min(mi->blk[i].start, start);
+			end = max(mi->blk[i].end, end);
 		}
-	}
 
-	return 0;
+		if (start < end)
+			setup_node_bootmem(nid, start, end);
+	}
 }
 
 #ifdef CONFIG_NUMA_EMU
@@ -968,6 +969,10 @@ void __init initmem_init(void)
 		if (numa_register_memblks(&numa_meminfo) < 0)
 			continue;
 
+		init_memory_mapping_high();
+
+		setup_numa_bootmem(&numa_meminfo);
+
 		for (j = 0; j < nr_cpu_ids; j++) {
 			int nid = early_cpu_to_node(j);
 
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