From: KAMEZAWA Hiroyuki Date: Tue, 27 Jun 2006 09:53:41 +0000 (-0700) Subject: [PATCH] node hotplug: register cpu: remove node struct X-Git-Tag: v2.6.18-rc1~571 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=76b67ed9dce69a6a329cdd66f94af1787f417b62;p=linux-2.6 [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 --- diff --git a/arch/alpha/kernel/setup.c b/arch/alpha/kernel/setup.c index 558b833685..254c507a60 100644 --- a/arch/alpha/kernel/setup.c +++ b/arch/alpha/kernel/setup.c @@ -481,7 +481,7 @@ register_cpus(void) struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL); if (!p) return -ENOMEM; - register_cpu(p, i, NULL); + register_cpu(p, i); } return 0; } diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c index 9fc9af88c6..093ccba050 100644 --- a/arch/arm/kernel/setup.c +++ b/arch/arm/kernel/setup.c @@ -808,7 +808,7 @@ static int __init topology_init(void) int cpu; for_each_possible_cpu(cpu) - register_cpu(&per_cpu(cpu_data, cpu).cpu, cpu, NULL); + register_cpu(&per_cpu(cpu_data, cpu).cpu, cpu); return 0; } diff --git a/arch/i386/kernel/topology.c b/arch/i386/kernel/topology.c index 1eecc2e1bd..e2e281d4bc 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); diff --git a/arch/ia64/kernel/topology.c b/arch/ia64/kernel/topology.c index 42cb05bdc6..5737c9a061 100644 --- a/arch/ia64/kernel/topology.c +++ b/arch/ia64/kernel/topology.c @@ -30,12 +30,6 @@ static struct ia64_cpu *sysfs_cpus; int arch_register_cpu(int num) { - struct node *parent = NULL; - -#ifdef CONFIG_NUMA - parent = &node_devices[cpu_to_node(num)]; -#endif /* CONFIG_NUMA */ - #if defined (CONFIG_ACPI) && defined (CONFIG_HOTPLUG_CPU) /* * If CPEI cannot be re-targetted, and this is @@ -45,21 +39,14 @@ int arch_register_cpu(int num) sysfs_cpus[num].cpu.no_control = 1; #endif - return register_cpu(&sysfs_cpus[num].cpu, num, parent); + return register_cpu(&sysfs_cpus[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); - parent = &node_devices[node]; -#endif /* CONFIG_NUMA */ - - return unregister_cpu(&sysfs_cpus[num].cpu, parent); + return unregister_cpu(&sysfs_cpus[num].cpu); } EXPORT_SYMBOL(arch_register_cpu); EXPORT_SYMBOL(arch_unregister_cpu); diff --git a/arch/m32r/kernel/setup.c b/arch/m32r/kernel/setup.c index 3cd3c2988a..1ff483c8a4 100644 --- a/arch/m32r/kernel/setup.c +++ b/arch/m32r/kernel/setup.c @@ -275,7 +275,7 @@ static int __init topology_init(void) int i; for_each_present_cpu(i) - register_cpu(&cpu_devices[i], i, NULL); + register_cpu(&cpu_devices[i], i); return 0; } diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c index 298f82fe84..9096a5ea42 100644 --- a/arch/mips/kernel/smp.c +++ b/arch/mips/kernel/smp.c @@ -446,7 +446,7 @@ static int __init topology_init(void) int ret; for_each_present_cpu(cpu) { - ret = register_cpu(&per_cpu(cpu_devices, cpu), cpu, NULL); + ret = register_cpu(&per_cpu(cpu_devices, cpu), cpu); if (ret) printk(KERN_WARNING "topology_init: register_cpu %d " "failed (%d)\n", cpu, ret); diff --git a/arch/parisc/kernel/topology.c b/arch/parisc/kernel/topology.c index 3ba040050e..068b20d822 100644 --- a/arch/parisc/kernel/topology.c +++ b/arch/parisc/kernel/topology.c @@ -26,11 +26,10 @@ static struct cpu cpu_devices[NR_CPUS] __read_mostly; static int __init topology_init(void) { - struct node *parent = NULL; int num; for_each_present_cpu(num) { - register_cpu(&cpu_devices[num], num, parent); + register_cpu(&cpu_devices[num], num); } return 0; } diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c index e5a4481244..0932a62a1c 100644 --- a/arch/powerpc/kernel/setup_32.c +++ b/arch/powerpc/kernel/setup_32.c @@ -215,7 +215,7 @@ int __init ppc_init(void) /* register CPU devices */ for_each_possible_cpu(i) - register_cpu(&cpu_devices[i], i, NULL); + register_cpu(&cpu_devices[i], i); /* call platform init */ if (ppc_md.init != NULL) { diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c index 338491d160..412ad00e22 100644 --- a/arch/powerpc/kernel/sysfs.c +++ b/arch/powerpc/kernel/sysfs.c @@ -348,23 +348,13 @@ static SYSDEV_ATTR(physical_id, 0444, show_physical_id, NULL); static int __init topology_init(void) { int cpu; - struct node *parent = NULL; register_nodes(); - register_cpu_notifier(&sysfs_cpu_nb); for_each_possible_cpu(cpu) { struct cpu *c = &per_cpu(cpu_devices, cpu); -#ifdef CONFIG_NUMA - /* The node to which a cpu belongs can't be known - * until the cpu is made present. - */ - parent = NULL; - if (cpu_present(cpu)) - parent = &node_devices[cpu_to_node(cpu)]; -#endif /* * For now, we just see if the system supports making * the RTAS calls for CPU hotplug. But, there may be a @@ -376,7 +366,7 @@ static int __init topology_init(void) c->no_control = 1; if (cpu_online(cpu) || (c->no_control == 0)) { - register_cpu(c, cpu, parent); + register_cpu(c, cpu); sysdev_create_file(&c->sysdev, &attr_physical_id); } diff --git a/arch/ppc/kernel/setup.c b/arch/ppc/kernel/setup.c index 1f79e84ab4..4b4607d89b 100644 --- a/arch/ppc/kernel/setup.c +++ b/arch/ppc/kernel/setup.c @@ -475,7 +475,7 @@ int __init ppc_init(void) /* register CPU devices */ for_each_possible_cpu(i) - register_cpu(&cpu_devices[i], i, NULL); + register_cpu(&cpu_devices[i], i); /* call platform init */ if (ppc_md.init != NULL) { diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index 343120c922..8e03219eea 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -869,7 +869,7 @@ static int __init topology_init(void) int ret; for_each_possible_cpu(cpu) { - ret = register_cpu(&per_cpu(cpu_devices, cpu), cpu, NULL); + ret = register_cpu(&per_cpu(cpu_devices, cpu), cpu); if (ret) printk(KERN_WARNING "topology_init: register_cpu %d " "failed (%d)\n", cpu, ret); diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c index bb229ef030..9af22116c9 100644 --- a/arch/sh/kernel/setup.c +++ b/arch/sh/kernel/setup.c @@ -402,7 +402,7 @@ static int __init topology_init(void) int cpu_id; for_each_possible_cpu(cpu_id) - register_cpu(&cpu[cpu_id], cpu_id, NULL); + register_cpu(&cpu[cpu_id], cpu_id); return 0; } diff --git a/arch/sh64/kernel/setup.c b/arch/sh64/kernel/setup.c index d2711c9c9d..da98d8dbcf 100644 --- a/arch/sh64/kernel/setup.c +++ b/arch/sh64/kernel/setup.c @@ -309,7 +309,7 @@ static struct cpu cpu[1]; static int __init topology_init(void) { - return register_cpu(cpu, 0, NULL); + return register_cpu(cpu, 0); } subsys_initcall(topology_init); diff --git a/arch/sparc64/kernel/setup.c b/arch/sparc64/kernel/setup.c index a6a7d81683..116d963200 100644 --- a/arch/sparc64/kernel/setup.c +++ b/arch/sparc64/kernel/setup.c @@ -537,7 +537,7 @@ static int __init topology_init(void) for_each_possible_cpu(i) { struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL); if (p) { - register_cpu(p, i, NULL); + register_cpu(p, i); err = 0; } } diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c index dd712b24ec..3972d8ac97 100644 --- a/drivers/base/cpu.c +++ b/drivers/base/cpu.c @@ -8,6 +8,7 @@ #include #include #include +#include #include "base.h" @@ -57,13 +58,12 @@ static void __devinit register_cpu_control(struct cpu *cpu) { sysdev_create_file(&cpu->sysdev, &attr_online); } -void unregister_cpu(struct cpu *cpu, struct node *root) +void unregister_cpu(struct cpu *cpu) { int logical_cpu = cpu->sysdev.id; - if (root) - sysfs_remove_link(&root->sysdev.kobj, - kobject_name(&cpu->sysdev.kobj)); + unregister_cpu_under_node(logical_cpu, cpu_to_node(logical_cpu)); + sysdev_remove_file(&cpu->sysdev, &attr_online); sysdev_unregister(&cpu->sysdev); @@ -109,23 +109,21 @@ static SYSDEV_ATTR(crash_notes, 0400, show_crash_notes, NULL); * * Initialize and register the CPU device. */ -int __devinit register_cpu(struct cpu *cpu, int num, struct node *root) +int __devinit register_cpu(struct cpu *cpu, int num) { int error; - cpu->node_id = cpu_to_node(num); cpu->sysdev.id = num; cpu->sysdev.cls = &cpu_sysdev_class; error = sysdev_register(&cpu->sysdev); - if (!error && root) - error = sysfs_create_link(&root->sysdev.kobj, - &cpu->sysdev.kobj, - kobject_name(&cpu->sysdev.kobj)); + if (!error && !cpu->no_control) register_cpu_control(cpu); if (!error) cpu_sys_devices[num] = &cpu->sysdev; + if (!error) + register_cpu_under_node(num, cpu_to_node(num)); #ifdef CONFIG_KEXEC if (!error) diff --git a/drivers/base/node.c b/drivers/base/node.c index cbd0f62b48..eae2bdc183 100644 --- a/drivers/base/node.c +++ b/drivers/base/node.c @@ -11,6 +11,7 @@ #include #include #include +#include static struct sysdev_class node_class = { set_kset_name("node"), @@ -192,9 +193,38 @@ void unregister_node(struct node *node) struct node node_devices[MAX_NUMNODES]; +/* + * register cpu under node + */ +int register_cpu_under_node(unsigned int cpu, unsigned int nid) +{ + if (node_online(nid)) { + struct sys_device *obj = get_cpu_sysdev(cpu); + if (!obj) + return 0; + return sysfs_create_link(&node_devices[nid].sysdev.kobj, + &obj->kobj, + kobject_name(&obj->kobj)); + } + + return 0; +} + +int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) +{ + if (node_online(nid)) { + struct sys_device *obj = get_cpu_sysdev(cpu); + if (obj) + sysfs_remove_link(&node_devices[nid].sysdev.kobj, + kobject_name(&obj->kobj)); + } + return 0; +} + int register_one_node(int nid) { int error = 0; + int cpu; if (node_online(nid)) { int p_node = parent_node(nid); @@ -204,6 +234,12 @@ int register_one_node(int nid) parent = &node_devices[p_node]; error = register_node(&node_devices[nid], nid, parent); + + /* link cpu under this node */ + for_each_present_cpu(cpu) { + if (cpu_to_node(cpu) == nid) + register_cpu_under_node(cpu, nid); + } } return error; diff --git a/include/linux/cpu.h b/include/linux/cpu.h index 08d50c53aa..b23bf1c8ad 100644 --- a/include/linux/cpu.h +++ b/include/linux/cpu.h @@ -31,10 +31,10 @@ struct cpu { struct sys_device sysdev; }; -extern int register_cpu(struct cpu *, int, struct node *); +extern int register_cpu(struct cpu *cpu, int num); extern struct sys_device *get_cpu_sysdev(unsigned cpu); #ifdef CONFIG_HOTPLUG_CPU -extern void unregister_cpu(struct cpu *, struct node *); +extern void unregister_cpu(struct cpu *cpu); #endif struct notifier_block; diff --git a/include/linux/node.h b/include/linux/node.h index 1e5347527f..81dcec84cd 100644 --- a/include/linux/node.h +++ b/include/linux/node.h @@ -32,6 +32,19 @@ extern int register_node(struct node *, int, struct node *); extern void unregister_node(struct node *node); extern int register_one_node(int nid); extern void unregister_one_node(int nid); +#ifdef CONFIG_NUMA +extern int register_cpu_under_node(unsigned int cpu, unsigned int nid); +extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid); +#else +static inline int register_cpu_under_node(unsigned int cpu, unsigned int nid) +{ + return 0; +} +static inline int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) +{ + return 0; +} +#endif #define to_node(sys_device) container_of(sys_device, struct node, sysdev)