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hotplug, powerpc, x86: Remove cpu_hotplug_driver_lock()

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cpu_hotplug_driver_lock() serializes CPU online/offline operations
when ARCH_CPU_PROBE_RELEASE is set.  This lock interface is no longer
necessary with the following reason:

 - lock_device_hotplug() now protects CPU online/offline operations,
   including the probe & release interfaces enabled by
   ARCH_CPU_PROBE_RELEASE.  The use of cpu_hotplug_driver_lock() is
   redundant.
 - cpu_hotplug_driver_lock() is only valid when ARCH_CPU_PROBE_RELEASE
   is defined, which is misleading and is only enabled on powerpc.

This patch removes the cpu_hotplug_driver_lock() interface.  As
a result, ARCH_CPU_PROBE_RELEASE only enables / disables the cpu
probe & release interface as intended.  There is no functional change
in this patch.

Signed-off-by: Toshi Kani <toshi.kani@hp.com>
Reviewed-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Toshi Kani
2013-09-25 15:08:27 -06:00
committed by Rafael J. Wysocki
parent 1cad5e9a39
commit 6dedcca610
5 changed files with 19 additions and 66 deletions
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2
arch/x86/kernel/topology.c
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@@ -66,7 +66,6 @@ int __ref _debug_hotplug_cpu(int cpu, int action)
return -EINVAL;
lock_device_hotplug();
cpu_hotplug_driver_lock();
switch (action) {
case 0:
@@ -91,7 +90,6 @@ int __ref _debug_hotplug_cpu(int cpu, int action)
ret = -EINVAL;
}
cpu_hotplug_driver_unlock();
unlock_device_hotplug();
return ret;