linux-kernel - [PATCH 02/33] x86-64, NUMA: Simplify hotplug node handling in acpi_numa_memory_affinity

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 16 Feb 2011 13:20:36 +0100
From:	Tejun Heo <tj@...nel.org>
To:	linux-kernel@...r.kernel.org, x86@...nel.org, yinghai@...nel.org,
	brgerst@...il.com, gorcunov@...il.com, shaohui.zheng@...el.com,
	rientjes@...gle.com, mingo@...e.hu, hpa@...ux.intel.com,
	ankita@...ibm.com
Cc:	Tejun Heo <tj@...nel.org>
Subject: [PATCH 02/33] x86-64, NUMA: Simplify hotplug node handling in acpi_numa_memory_affinity_init()

Hotplug node handling in acpi_numa_memory_affinity_init() was
unnecessarily complicated with storing the original nodes[] entry and
restoring it afterwards.  Simplify it by not modifying the nodes[]
entry for hotplug nodes from the beginning.

Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Yinghai Lu <yinghai@...nel.org>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Cyrill Gorcunov <gorcunov@...il.com>
Cc: Shaohui Zheng <shaohui.zheng@...el.com>
Cc: David Rientjes <rientjes@...gle.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: H. Peter Anvin <hpa@...ux.intel.com>
---
 arch/x86/mm/srat_64.c |   31 +++++++++++++------------------
 1 files changed, 13 insertions(+), 18 deletions(-)

diff --git a/arch/x86/mm/srat_64.c b/arch/x86/mm/srat_64.c
index 23498f8..988b0b7 100644
--- a/arch/x86/mm/srat_64.c
+++ b/arch/x86/mm/srat_64.c
@@ -251,7 +251,7 @@ update_nodes_add(int node, unsigned long start, unsigned long end)
 void __init
 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
 {
-	struct bootnode *nd, oldnode;
+	struct bootnode *nd;
 	unsigned long start, end;
 	int node, pxm;
 	int i;
@@ -289,28 +289,23 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
 		bad_srat();
 		return;
 	}
-	nd = &nodes[node];
-	oldnode = *nd;
-	if (!node_test_and_set(node, nodes_parsed)) {
-		nd->start = start;
-		nd->end = end;
-	} else {
-		if (start < nd->start)
-			nd->start = start;
-		if (nd->end < end)
-			nd->end = end;
-	}
 
 	printk(KERN_INFO "SRAT: Node %u PXM %u %lx-%lx\n", node, pxm,
 	       start, end);
 
-	if (ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) {
+	if (!(ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)) {
+		nd = &nodes[node];
+		if (!node_test_and_set(node, nodes_parsed)) {
+			nd->start = start;
+			nd->end = end;
+		} else {
+			if (start < nd->start)
+				nd->start = start;
+			if (nd->end < end)
+				nd->end = end;
+		}
+	} else
 		update_nodes_add(node, start, end);
-		/* restore nodes[node] */
-		*nd = oldnode;
-		if ((nd->start | nd->end) == 0)
-			node_clear(node, nodes_parsed);
-	}
 
 	node_memblk_range[num_node_memblks].start = start;
 	node_memblk_range[num_node_memblks].end = end;
-- 
1.7.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/