device_create(): make fmt argument 'const char *'

[linux-2.6-omap-h63xx.git] / drivers / base / cpu.c

diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index 281d26784d251107bc6b158ba3ce5f5904a157fd..4bef76a2f3f2a7611ff0dcbca79c8d774d7a7255 100644 (file)
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -8,6 +8,7 @@
 #include <linux/cpu.h>
 #include <linux/topology.h>
 #include <linux/device.h>
+#include <linux/node.h>
 
 #include "base.h"
 
@@ -19,11 +20,6 @@ EXPORT_SYMBOL(cpu_sysdev_class);
 static struct sys_device *cpu_sys_devices[NR_CPUS];
 
 #ifdef CONFIG_HOTPLUG_CPU
-int __attribute__((weak)) smp_prepare_cpu (int cpu)
-{
-       return 0;
-}
-
 static ssize_t show_online(struct sys_device *dev, char *buf)
 {
        struct cpu *cpu = container_of(dev, struct cpu, sysdev);
@@ -44,9 +40,7 @@ static ssize_t store_online(struct sys_device *dev, const char *buf,
                        kobject_uevent(&dev->kobj, KOBJ_OFFLINE);
                break;
        case '1':
-               ret = smp_prepare_cpu(cpu->sysdev.id);
-               if (!ret)
-                       ret = cpu_up(cpu->sysdev.id);
+               ret = cpu_up(cpu->sysdev.id);
                if (!ret)
                        kobject_uevent(&dev->kobj, KOBJ_ONLINE);
                break;
@@ -64,13 +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);
@@ -83,6 +76,31 @@ static inline void register_cpu_control(struct cpu *cpu)
 }
 #endif /* CONFIG_HOTPLUG_CPU */
 
+#ifdef CONFIG_KEXEC
+#include <linux/kexec.h>
+
+static ssize_t show_crash_notes(struct sys_device *dev, char *buf)
+{
+       struct cpu *cpu = container_of(dev, struct cpu, sysdev);
+       ssize_t rc;
+       unsigned long long addr;
+       int cpunum;
+
+       cpunum = cpu->sysdev.id;
+
+       /*
+        * Might be reading other cpu's data based on which cpu read thread
+        * has been scheduled. But cpu data (memory) is allocated once during
+        * boot up and this data does not change there after. Hence this
+        * operation should be safe. No locking required.
+        */
+       addr = __pa(per_cpu_ptr(crash_notes, cpunum));
+       rc = sprintf(buf, "%Lx\n", addr);
+       return rc;
+}
+static SYSDEV_ATTR(crash_notes, 0400, show_crash_notes, NULL);
+#endif
+
 /*
  * register_cpu - Setup a driverfs device for a CPU.
  * @cpu - Callers can set the cpu->no_control field to 1, to indicate not to
@@ -91,27 +109,30 @@ static inline void register_cpu_control(struct cpu *cpu)
  *
  * 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)
+               error = sysdev_create_file(&cpu->sysdev, &attr_crash_notes);
+#endif
        return error;
 }
 
-struct sys_device *get_cpu_sysdev(int cpu)
+struct sys_device *get_cpu_sysdev(unsigned cpu)
 {
        if (cpu < NR_CPUS)
                return cpu_sys_devices[cpu];
@@ -122,5 +143,13 @@ EXPORT_SYMBOL_GPL(get_cpu_sysdev);
 
 int __init cpu_dev_init(void)
 {
-       return sysdev_class_register(&cpu_sysdev_class);
+       int err;
+
+       err = sysdev_class_register(&cpu_sysdev_class);
+#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
+       if (!err)
+               err = sched_create_sysfs_power_savings_entries(&cpu_sysdev_class);
+#endif
+
+       return err;
 }