cpu: convert 'cpu' and 'machinecheck' sysdev_class to a regular subsystem

This moves the 'cpu sysdev_class' over to a regular 'cpu' subsystem
and converts the devices to regular devices. The sysdev drivers are
implemented as subsystem interfaces now.

After all sysdev classes are ported to regular driver core entities, the
sysdev implementation will be entirely removed from the kernel.

Userspace relies on events and generic sysfs subsystem infrastructure
from sysdev devices, which are made available with this conversion.

Cc: Haavard Skinnemoen <hskinnemoen@gmail.com>
Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Borislav Petkov <bp@amd64.org>
Cc: Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
Cc: Len Brown <lenb@kernel.org>
Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Dave Jones <davej@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 12 insertions, 13 deletions

diff --git a/arch/x86/kernel/cpu/intel_cacheinfo.c b/arch/x86/kernel/cpu/intel_cacheinfo.c
index a3b0811693c9..6b45e5e7a901 100644
--- a/arch/x86/kernel/cpu/intel_cacheinfo.c
+++ b/arch/x86/kernel/cpu/intel_cacheinfo.c
@@ -844,8 +844,7 @@ static int __cpuinit detect_cache_attributes(unsigned int cpu)
 
 #include <linux/kobject.h>
 #include <linux/sysfs.h>
-
-extern struct sysdev_class cpu_sysdev_class; /* from drivers/base/cpu.c */
+#include <linux/cpu.h>
 
 /* pointer to kobject for cpuX/cache */
 static DEFINE_PER_CPU(struct kobject *, ici_cache_kobject);
@@ -1073,9 +1072,9 @@ err_out:
 static DECLARE_BITMAP(cache_dev_map, NR_CPUS);
 
 /* Add/Remove cache interface for CPU device */
-static int __cpuinit cache_add_dev(struct sys_device * sys_dev)
+static int __cpuinit cache_add_dev(struct device *dev)
 {
-	unsigned int cpu = sys_dev->id;
+	unsigned int cpu = dev->id;
 	unsigned long i, j;
 	struct _index_kobject *this_object;
 	struct _cpuid4_info   *this_leaf;
@@ -1087,7 +1086,7 @@ static int __cpuinit cache_add_dev(struct sys_device * sys_dev)
 
 	retval = kobject_init_and_add(per_cpu(ici_cache_kobject, cpu),
 				      &ktype_percpu_entry,
-				      &sys_dev->kobj, "%s", "cache");
+				      &dev->kobj, "%s", "cache");
 	if (retval < 0) {
 		cpuid4_cache_sysfs_exit(cpu);
 		return retval;
@@ -1124,9 +1123,9 @@ static int __cpuinit cache_add_dev(struct sys_device * sys_dev)
 	return 0;
 }
 
-static void __cpuinit cache_remove_dev(struct sys_device * sys_dev)
+static void __cpuinit cache_remove_dev(struct device *dev)
 {
-	unsigned int cpu = sys_dev->id;
+	unsigned int cpu = dev->id;
 	unsigned long i;
 
 	if (per_cpu(ici_cpuid4_info, cpu) == NULL)
@@ -1145,17 +1144,17 @@ static int __cpuinit cacheinfo_cpu_callback(struct notifier_block *nfb,
 					unsigned long action, void *hcpu)
 {
 	unsigned int cpu = (unsigned long)hcpu;
-	struct sys_device *sys_dev;
+	struct device *dev;
 
-	sys_dev = get_cpu_sysdev(cpu);
+	dev = get_cpu_device(cpu);
 	switch (action) {
 	case CPU_ONLINE:
 	case CPU_ONLINE_FROZEN:
-		cache_add_dev(sys_dev);
+		cache_add_dev(dev);
 		break;
 	case CPU_DEAD:
 	case CPU_DEAD_FROZEN:
-		cache_remove_dev(sys_dev);
+		cache_remove_dev(dev);
 		break;
 	}
 	return NOTIFY_OK;
@@ -1174,9 +1173,9 @@ static int __cpuinit cache_sysfs_init(void)
 
 	for_each_online_cpu(i) {
 		int err;
-		struct sys_device *sys_dev = get_cpu_sysdev(i);
+		struct device *dev = get_cpu_device(i);
 
-		err = cache_add_dev(sys_dev);
+		err = cache_add_dev(dev);
 		if (err)
 			return err;
 	}