From 76b67ed9dce69a6a329cdd66f94af1787f417b62 Mon Sep 17 00:00:00 2001 From: KAMEZAWA Hiroyuki Date: Tue, 27 Jun 2006 02:53:41 -0700 Subject: [PATCH] node hotplug: register cpu: remove node struct With Goto-san's patch, we can add new pgdat/node at runtime. I'm now considering node-hot-add with cpu + memory on ACPI. I found acpi container, which describes node, could evaluate cpu before memory. This means cpu-hot-add occurs before memory hot add. In most part, cpu-hot-add doesn't depend on node hot add. But register_cpu(), which creates symbolic link from node to cpu, requires that node should be onlined before register_cpu(). When a node is onlined, its pgdat should be there. This patch-set holds off creating symbolic link from node to cpu until node is onlined. This removes node arguments from register_cpu(). Now, register_cpu() requires 'struct node' as its argument. But the array of struct node is now unified in driver/base/node.c now (By Goto's node hotplug patch). We can get struct node in generic way. So, this argument is not necessary now. This patch also guarantees add cpu under node only when node is onlined. It is necessary for node-hot-add vs. cpu-hot-add patch following this. Moreover, register_cpu calculates cpu->node_id by cpu_to_node() without regard to its 'struct node *root' argument. This patch removes it. Also modify callers of register_cpu()/unregister_cpu, whose args are changed by register-cpu-remove-node-struct patch. [Brice.Goglin@ens-lyon.org: fix it] Signed-off-by: KAMEZAWA Hiroyuki Cc: Yasunori Goto Cc: Ashok Raj Cc: Dave Hansen Signed-off-by: Brice Goglin Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/i386/kernel/topology.c | 23 ++++------------------- 1 file changed, 4 insertions(+), 19 deletions(-) (limited to 'arch/i386/kernel/topology.c') diff --git a/arch/i386/kernel/topology.c b/arch/i386/kernel/topology.c index 1eecc2e1bd4b..e2e281d4bcc8 100644 --- a/arch/i386/kernel/topology.c +++ b/arch/i386/kernel/topology.c @@ -32,15 +32,8 @@ static struct i386_cpu cpu_devices[NR_CPUS]; -int arch_register_cpu(int num){ - struct node *parent = NULL; - -#ifdef CONFIG_NUMA - int node = cpu_to_node(num); - if (node_online(node)) - parent = &node_devices[parent_node(node)]; -#endif /* CONFIG_NUMA */ - +int arch_register_cpu(int num) +{ /* * CPU0 cannot be offlined due to several * restrictions and assumptions in kernel. This basically @@ -50,21 +43,13 @@ int arch_register_cpu(int num){ if (!num) cpu_devices[num].cpu.no_control = 1; - return register_cpu(&cpu_devices[num].cpu, num, parent); + return register_cpu(&cpu_devices[num].cpu, num); } #ifdef CONFIG_HOTPLUG_CPU void arch_unregister_cpu(int num) { - struct node *parent = NULL; - -#ifdef CONFIG_NUMA - int node = cpu_to_node(num); - if (node_online(node)) - parent = &node_devices[parent_node(node)]; -#endif /* CONFIG_NUMA */ - - return unregister_cpu(&cpu_devices[num].cpu, parent); + return unregister_cpu(&cpu_devices[num].cpu); } EXPORT_SYMBOL(arch_register_cpu); EXPORT_SYMBOL(arch_unregister_cpu); -- cgit v1.2.2