summaryrefslogtreecommitdiffstats
path: root/drivers
diff options
context:
space:
mode:
authorBen Hutchings <ben@decadent.org.uk>2012-01-10 03:04:32 +0000
committerLinus Torvalds <torvalds@linux-foundation.org>2012-01-11 15:50:11 -0800
commit9f13a1fd452f11c18004ba2422a6384b424ec8a9 (patch)
tree6aa799a5e095f8cfa03c7386e6d0a20ebda595e4 /drivers
parent024f78462c3da710642a54939888a92e28704653 (diff)
downloadop-kernel-dev-9f13a1fd452f11c18004ba2422a6384b424ec8a9.zip
op-kernel-dev-9f13a1fd452f11c18004ba2422a6384b424ec8a9.tar.gz
cpu: Register a generic CPU device on architectures that currently do not
frv, h8300, m68k, microblaze, openrisc, score, um and xtensa currently do not register a CPU device. Add the config option GENERIC_CPU_DEVICES which causes a generic CPU device to be registered for each present CPU, and make all these architectures select it. Richard Weinberger <richard@nod.at> covered UML and suggested using per_cpu. Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/base/Kconfig4
-rw-r--r--drivers/base/cpu.c19
2 files changed, 23 insertions, 0 deletions
diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
index e95c67e..fcbec8a 100644
--- a/drivers/base/Kconfig
+++ b/drivers/base/Kconfig
@@ -172,6 +172,10 @@ config SYS_HYPERVISOR
bool
default n
+config GENERIC_CPU_DEVICES
+ bool
+ default n
+
source "drivers/base/regmap/Kconfig"
config DMA_SHARED_BUFFER
diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index bba70d0..db87e78 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -11,6 +11,7 @@
#include <linux/device.h>
#include <linux/node.h>
#include <linux/gfp.h>
+#include <linux/percpu.h>
#include "base.h"
@@ -275,11 +276,29 @@ bool cpu_is_hotpluggable(unsigned cpu)
}
EXPORT_SYMBOL_GPL(cpu_is_hotpluggable);
+#ifdef CONFIG_GENERIC_CPU_DEVICES
+static DEFINE_PER_CPU(struct cpu, cpu_devices);
+#endif
+
+static void __init cpu_dev_register_generic(void)
+{
+#ifdef CONFIG_GENERIC_CPU_DEVICES
+ int i;
+
+ for_each_possible_cpu(i) {
+ if (register_cpu(&per_cpu(cpu_devices, i), i))
+ panic("Failed to register CPU device");
+ }
+#endif
+}
+
void __init cpu_dev_init(void)
{
if (subsys_system_register(&cpu_subsys, cpu_root_attr_groups))
panic("Failed to register CPU subsystem");
+ cpu_dev_register_generic();
+
#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
sched_create_sysfs_power_savings_entries(cpu_subsys.dev_root);
#endif
OpenPOWER on IntegriCloud