Merge tag 'cpu-hotplug-3.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull CPU hotplug notifiers registration fixes from Rafael Wysocki:
 "The purpose of this single series of commits from Srivatsa S Bhat
  (with a small piece from Gautham R Shenoy) touching multiple
  subsystems that use CPU hotplug notifiers is to provide a way to
  register them that will not lead to deadlocks with CPU online/offline
  operations as described in the changelog of commit 93ae4f978ca7f ("CPU
  hotplug: Provide lockless versions of callback registration
  functions").

  The first three commits in the series introduce the API and document
  it and the rest simply goes through the users of CPU hotplug notifiers
  and converts them to using the new method"

* tag 'cpu-hotplug-3.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (52 commits)
  net/iucv/iucv.c: Fix CPU hotplug callback registration
  net/core/flow.c: Fix CPU hotplug callback registration
  mm, zswap: Fix CPU hotplug callback registration
  mm, vmstat: Fix CPU hotplug callback registration
  profile: Fix CPU hotplug callback registration
  trace, ring-buffer: Fix CPU hotplug callback registration
  xen, balloon: Fix CPU hotplug callback registration
  hwmon, via-cputemp: Fix CPU hotplug callback registration
  hwmon, coretemp: Fix CPU hotplug callback registration
  thermal, x86-pkg-temp: Fix CPU hotplug callback registration
  octeon, watchdog: Fix CPU hotplug callback registration
  oprofile, nmi-timer: Fix CPU hotplug callback registration
  intel-idle: Fix CPU hotplug callback registration
  clocksource, dummy-timer: Fix CPU hotplug callback registration
  drivers/base/topology.c: Fix CPU hotplug callback registration
  acpi-cpufreq: Fix CPU hotplug callback registration
  zsmalloc: Fix CPU hotplug callback registration
  scsi, fcoe: Fix CPU hotplug callback registration
  scsi, bnx2fc: Fix CPU hotplug callback registration
  scsi, bnx2i: Fix CPU hotplug callback registration
  ...

4 files changed, 28 insertions, 5 deletions

diff --git a/arch/ia64/kernel/err_inject.c b/arch/ia64/kernel/err_inject.c
index f59c0b844e88..0c161ed6d18e 100644
--- a/arch/ia64/kernel/err_inject.c
+++ b/arch/ia64/kernel/err_inject.c
@@ -269,12 +269,17 @@ err_inject_init(void)
 #ifdef ERR_INJ_DEBUG
         printk(KERN_INFO "Enter error injection driver.\n");
 #endif
+
+        cpu_notifier_register_begin();
+
         for_each_online_cpu(i) {
                 err_inject_cpu_callback(&err_inject_cpu_notifier, CPU_ONLINE,
                                 (void *)(long)i);
         }
 
-        register_hotcpu_notifier(&err_inject_cpu_notifier);
+        __register_hotcpu_notifier(&err_inject_cpu_notifier);
+
+        cpu_notifier_register_done();
 
         return 0;
 }
@@ -288,11 +293,17 @@ err_inject_exit(void)
 #ifdef ERR_INJ_DEBUG
         printk(KERN_INFO "Exit error injection driver.\n");
 #endif
+
+        cpu_notifier_register_begin();
+
         for_each_online_cpu(i) {
                 sys_dev = get_cpu_device(i);
                 sysfs_remove_group(&sys_dev->kobj, &err_inject_attr_group);
         }
-        unregister_hotcpu_notifier(&err_inject_cpu_notifier);
+
+        __unregister_hotcpu_notifier(&err_inject_cpu_notifier);
+
+        cpu_notifier_register_done();
 }
 
 module_init(err_inject_init);
diff --git a/arch/ia64/kernel/palinfo.c b/arch/ia64/kernel/palinfo.c
index ab333284f4b2..c39c3cd3ac34 100644
--- a/arch/ia64/kernel/palinfo.c
+++ b/arch/ia64/kernel/palinfo.c
@@ -996,13 +996,17 @@ palinfo_init(void)
         if (!palinfo_dir)
                 return -ENOMEM;
 
+        cpu_notifier_register_begin();
+
         /* Create palinfo dirs in /proc for all online cpus */
         for_each_online_cpu(i) {
                 create_palinfo_proc_entries(i);
         }
 
         /* Register for future delivery via notify registration */
-        register_hotcpu_notifier(&palinfo_cpu_notifier);
+        __register_hotcpu_notifier(&palinfo_cpu_notifier);
+
+        cpu_notifier_register_done();
 
         return 0;
 }
diff --git a/arch/ia64/kernel/salinfo.c b/arch/ia64/kernel/salinfo.c
index 960a396f5929..ee9719eebb1e 100644
--- a/arch/ia64/kernel/salinfo.c
+++ b/arch/ia64/kernel/salinfo.c
@@ -635,6 +635,8 @@ salinfo_init(void)
                                            (void *)salinfo_entries[i].feature);
         }
 
+        cpu_notifier_register_begin();
+
         for (i = 0; i < ARRAY_SIZE(salinfo_log_name); i++) {
                 data = salinfo_data + i;
                 data->type = i;
@@ -669,7 +671,9 @@ salinfo_init(void)
         salinfo_timer.function = &salinfo_timeout;
         add_timer(&salinfo_timer);
 
-        register_hotcpu_notifier(&salinfo_cpu_notifier);
+        __register_hotcpu_notifier(&salinfo_cpu_notifier);
+
+        cpu_notifier_register_done();
 
         return 0;
 }
diff --git a/arch/ia64/kernel/topology.c b/arch/ia64/kernel/topology.c
index ca69a5a96dcc..f295f9abba4b 100644
--- a/arch/ia64/kernel/topology.c
+++ b/arch/ia64/kernel/topology.c
@@ -454,12 +454,16 @@ static int __init cache_sysfs_init(void)
 {
         int i;
 
+        cpu_notifier_register_begin();
+
         for_each_online_cpu(i) {
                 struct device *sys_dev = get_cpu_device((unsigned int)i);
                 cache_add_dev(sys_dev);
         }
 
-        register_hotcpu_notifier(&cache_cpu_notifier);
+        __register_hotcpu_notifier(&cache_cpu_notifier);
+
+        cpu_notifier_register_done();
 
         return 0;
 }