Merge branch 'for-linus' of ssh://master.kernel.org/pub/scm/linux/kernel/git/hskinnem...

[linux-2.6-omap-h63xx.git] / arch / sparc64 / kernel / mdesc.c

diff --git a/arch/sparc64/kernel/mdesc.c b/arch/sparc64/kernel/mdesc.c
index 95059c2ec414804e50d63681b60ddd2ccfaa4be4..856659bb13116ed7444c263ec1a9f8087c660ec7 100644 (file)
--- a/arch/sparc64/kernel/mdesc.c
+++ b/arch/sparc64/kernel/mdesc.c
@@ -9,6 +9,7 @@
 #include <linux/list.h>
 #include <linux/slab.h>
 #include <linux/mm.h>
+#include <linux/miscdevice.h>
 
 #include <asm/hypervisor.h>
 #include <asm/mdesc.h>
@@ -776,8 +777,12 @@ void __devinit mdesc_fill_in_cpu_data(cpumask_t mask)
                cpuid = *id;
 
 #ifdef CONFIG_SMP
-               if (cpuid >= NR_CPUS)
+               if (cpuid >= NR_CPUS) {
+                       printk(KERN_WARNING "Ignoring CPU %d which is "
+                              ">= NR_CPUS (%d)\n",
+                              cpuid, NR_CPUS);
                        continue;
+               }
                if (!cpu_isset(cpuid, mask))
                        continue;
 #else
@@ -836,6 +841,43 @@ void __devinit mdesc_fill_in_cpu_data(cpumask_t mask)
        mdesc_release(hp);
 }
 
+static ssize_t mdesc_read(struct file *file, char __user *buf,
+                         size_t len, loff_t *offp)
+{
+       struct mdesc_handle *hp = mdesc_grab();
+       int err;
+
+       if (!hp)
+               return -ENODEV;
+
+       err = hp->handle_size;
+       if (len < hp->handle_size)
+               err = -EMSGSIZE;
+       else if (copy_to_user(buf, &hp->mdesc, hp->handle_size))
+               err = -EFAULT;
+       mdesc_release(hp);
+
+       return err;
+}
+
+static const struct file_operations mdesc_fops = {
+       .read   = mdesc_read,
+       .owner  = THIS_MODULE,
+};
+
+static struct miscdevice mdesc_misc = {
+       .minor  = MISC_DYNAMIC_MINOR,
+       .name   = "mdesc",
+       .fops   = &mdesc_fops,
+};
+
+static int __init mdesc_misc_init(void)
+{
+       return misc_register(&mdesc_misc);
+}
+
+__initcall(mdesc_misc_init);
+
 void __init sun4v_mdesc_init(void)
 {
        struct mdesc_handle *hp;