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, 19 insertions, 21 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index 0e9344a71be3..530772646443 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -7923,54 +7923,52 @@ static ssize_t sched_power_savings_store(const char *buf, size_t count, int smt)
 }
 
 #ifdef CONFIG_SCHED_MC
-static ssize_t sched_mc_power_savings_show(struct sysdev_class *class,
-                                           struct sysdev_class_attribute *attr,
-                                           char *page)
+static ssize_t sched_mc_power_savings_show(struct device *dev,
+                                           struct device_attribute *attr,
+                                           char *buf)
 {
-        return sprintf(page, "%u\n", sched_mc_power_savings);
+        return sprintf(buf, "%u\n", sched_mc_power_savings);
 }
-static ssize_t sched_mc_power_savings_store(struct sysdev_class *class,
-                                            struct sysdev_class_attribute *attr,
+static ssize_t sched_mc_power_savings_store(struct device *dev,
+                                            struct device_attribute *attr,
                                             const char *buf, size_t count)
 {
         return sched_power_savings_store(buf, count, 0);
 }
-static SYSDEV_CLASS_ATTR(sched_mc_power_savings, 0644,
-                         sched_mc_power_savings_show,
-                         sched_mc_power_savings_store);
+static DEVICE_ATTR(sched_mc_power_savings, 0644,
+                   sched_mc_power_savings_show,
+                   sched_mc_power_savings_store);
 #endif
 
 #ifdef CONFIG_SCHED_SMT
-static ssize_t sched_smt_power_savings_show(struct sysdev_class *dev,
-                                            struct sysdev_class_attribute *attr,
-                                            char *page)
+static ssize_t sched_smt_power_savings_show(struct device *dev,
+                                            struct device_attribute *attr,
+                                            char *buf)
 {
-        return sprintf(page, "%u\n", sched_smt_power_savings);
+        return sprintf(buf, "%u\n", sched_smt_power_savings);
 }
-static ssize_t sched_smt_power_savings_store(struct sysdev_class *dev,
-                                             struct sysdev_class_attribute *attr,
+static ssize_t sched_smt_power_savings_store(struct device *dev,
+                                            struct device_attribute *attr,
                                              const char *buf, size_t count)
 {
         return sched_power_savings_store(buf, count, 1);
 }
-static SYSDEV_CLASS_ATTR(sched_smt_power_savings, 0644,
+static DEVICE_ATTR(sched_smt_power_savings, 0644,
                    sched_smt_power_savings_show,
                    sched_smt_power_savings_store);
 #endif
 
-int __init sched_create_sysfs_power_savings_entries(struct sysdev_class *cls)
+int __init sched_create_sysfs_power_savings_entries(struct device *dev)
 {
         int err = 0;
 
 #ifdef CONFIG_SCHED_SMT
         if (smt_capable())
-                err = sysfs_create_file(&cls->kset.kobj,
-                                        &attr_sched_smt_power_savings.attr);
+                err = device_create_file(dev, &dev_attr_sched_smt_power_savings);
 #endif
 #ifdef CONFIG_SCHED_MC
         if (!err && mc_capable())
-                err = sysfs_create_file(&cls->kset.kobj,
-                                        &attr_sched_mc_power_savings.attr);
+                err = device_create_file(dev, &dev_attr_sched_mc_power_savings);
 #endif
         return err;
 }