A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-29 03:01:39 -04:00
Code Issues Projects Releases Packages Wiki Activity

hotplug, powerpc, x86: Remove cpu_hotplug_driver_lock()

Browse source 
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 <[email protected]>
Reviewed-by: Nathan Fontenot <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Toshi Kani 2013-09-25 15:08:27 -06:00 • committed by Rafael J. Wysocki
commit 6dedcca610
5 changed files with 19 additions and 66 deletions
Download patch file Download diff file Expand all files Collapse all files

15
drivers/base/cpu.c
View file

@ -44,13 +44,11 @@ static int __ref cpu_subsys_online(struct device *dev)
struct cpu *cpu = container_of(dev, struct cpu, dev);
int cpuid = dev->id;
int from_nid, to_nid;
int ret = -ENODEV;
cpu_hotplug_driver_lock();
int ret;
from_nid = cpu_to_node(cpuid);
if (from_nid == NUMA_NO_NODE)
goto out;
return -ENODEV;
ret = cpu_up(cpuid);
/*
@ -61,19 +59,12 @@ static int __ref cpu_subsys_online(struct device *dev)
if (from_nid != to_nid)
change_cpu_under_node(cpu, from_nid, to_nid);
out:
cpu_hotplug_driver_unlock();
return ret;
}
static int cpu_subsys_offline(struct device *dev)
{
int ret;
cpu_hotplug_driver_lock();
ret = cpu_down(dev->id);
cpu_hotplug_driver_unlock();
return ret;
return cpu_down(dev->id);
}
void unregister_cpu(struct cpu *cpu)