linux-kernel - [Patch 1/4] x86: get pg_data

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Message-ID: <4FB0F356.70101@jp.fujitsu.com>
Date:	Mon, 14 May 2012 20:58:14 +0900
From:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To:	Lai Jiangshan <laijs@...fujitsu.com>
CC:	Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: [Patch 1/4] x86: get pg_data_t's memory from other node

If system can create movable node which all memory of the
node is allocated as ZONE_MOVABLE, setup_node_data() cannot
allocate memory for the node's pg_data_t.
So when memblock_alloc_nid() fails, setup_node_data() retries
memblock_alloc().

---
  arch/x86/mm/numa.c |    8 ++++++--
  1 file changed, 6 insertions(+), 2 deletions(-)

Index: linux-3.4-rc6/arch/x86/mm/numa.c
===================================================================
--- linux-3.4-rc6.orig/arch/x86/mm/numa.c	2012-05-15 06:43:38.887962970 +0900
+++ linux-3.4-rc6/arch/x86/mm/numa.c	2012-05-15 06:43:42.422918776 +0900
@@ -223,9 +223,13 @@ static void __init setup_node_data(int n
  		remapped = true;
  	} else {
  		nd_pa = memblock_alloc_nid(nd_size, SMP_CACHE_BYTES, nid);
-		if (!nd_pa) {
-			pr_err("Cannot find %zu bytes in node %d\n",
+		if (!nd_pa)
+			printk(KERN_WARNING "Cannot find %zu bytes in node %d\n",
  			       nd_size, nid);
+		nd_pa = memblock_alloc(nd_size, SMP_CACHE_BYTES);
+		if (!nd_pa) {
+			pr_err("Cannot find %zu bytes in other node\n",
+			       nd_size);
  			return;
  		}
  		nd = __va(nd_pa);

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