cpu-hotplug: replace per-subsystem mutexes with get_online_cpus()

This patch converts the known per-subsystem mutexes to get_online_cpus
put_online_cpus. It also eliminates the CPU_LOCK_ACQUIRE and
CPU_LOCK_RELEASE hotplug notification events.

Signed-off-by: Gautham  R Shenoy <ego@in.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 4 deletions

diff --git a/kernel/cpu.c b/kernel/cpu.c
index b0c4152995f8..e0d3a4f56ecb 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -218,7 +218,6 @@ static int _cpu_down(unsigned int cpu, int tasks_frozen)
                 return -EINVAL;
 
         cpu_hotplug_begin();
-        raw_notifier_call_chain(&cpu_chain, CPU_LOCK_ACQUIRE, hcpu);
         err = __raw_notifier_call_chain(&cpu_chain, CPU_DOWN_PREPARE | mod,
                                         hcpu, -1, &nr_calls);
         if (err == NOTIFY_BAD) {
@@ -271,7 +270,6 @@ out_thread:
 out_allowed:
         set_cpus_allowed(current, old_allowed);
 out_release:
-        raw_notifier_call_chain(&cpu_chain, CPU_LOCK_RELEASE, hcpu);
         cpu_hotplug_done();
         return err;
 }
@@ -302,7 +300,6 @@ static int __cpuinit _cpu_up(unsigned int cpu, int tasks_frozen)
                 return -EINVAL;
 
         cpu_hotplug_begin();
-        raw_notifier_call_chain(&cpu_chain, CPU_LOCK_ACQUIRE, hcpu);
         ret = __raw_notifier_call_chain(&cpu_chain, CPU_UP_PREPARE | mod, hcpu,
                                                         -1, &nr_calls);
         if (ret == NOTIFY_BAD) {
@@ -326,7 +323,6 @@ out_notify:
         if (ret != 0)
                 __raw_notifier_call_chain(&cpu_chain,
                                 CPU_UP_CANCELED | mod, hcpu, nr_calls, NULL);
-        raw_notifier_call_chain(&cpu_chain, CPU_LOCK_RELEASE, hcpu);
         cpu_hotplug_done();
 
         return ret;