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authorThomas Renninger <trenn@suse.de>2012-01-26 03:09:14 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2012-01-27 04:49:08 +0400
commitfad12ac8c8c2591c7f4e61d19b6a9d76cd49fafa (patch)
treee2a77737265a193bbec7ecfd08f4989931a0ba89 /drivers/base/cpu.c
parent78ff123b05fb15beb1ad670372eea0d299d0b8af (diff)
downloadlinux-fad12ac8c8c2591c7f4e61d19b6a9d76cd49fafa.tar.xz
CPU: Introduce ARCH_HAS_CPU_AUTOPROBE and X86 parts
This patch is based on Andi Kleen's work: Implement autoprobing/loading of modules serving CPU specific features (x86cpu autoloading). And Kay Siever's work to get rid of sysdev cpu structures and making use of struct device instead. Before, the cpuid driver had to be loaded to get the x86cpu autoloading feature. With this patch autoloading works through the /sys/devices/system/cpu object Cc: Kay Sievers <kay.sievers@vrfy.org> Cc: Dave Jones <davej@redhat.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Huang Ying <ying.huang@intel.com> Cc: Len Brown <lenb@kernel.org> Acked-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Thomas Renninger <trenn@suse.de> Acked-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/base/cpu.c')
-rw-r--r--drivers/base/cpu.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index db87e78d7459..2a0c670c281d 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/slab.h>
#include <linux/percpu.h>
#include "base.h"
@@ -223,6 +224,9 @@ int __cpuinit register_cpu(struct cpu *cpu, int num)
cpu->node_id = cpu_to_node(num);
cpu->dev.id = num;
cpu->dev.bus = &cpu_subsys;
+#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE
+ cpu->dev.bus->uevent = arch_cpu_uevent;
+#endif
error = device_register(&cpu->dev);
if (!error && cpu->hotpluggable)
register_cpu_control(cpu);
@@ -247,6 +251,10 @@ struct device *get_cpu_device(unsigned cpu)
}
EXPORT_SYMBOL_GPL(get_cpu_device);
+#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE
+static DEVICE_ATTR(modalias, 0444, arch_print_cpu_modalias, NULL);
+#endif
+
static struct attribute *cpu_root_attrs[] = {
#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
&dev_attr_probe.attr,
@@ -257,6 +265,9 @@ static struct attribute *cpu_root_attrs[] = {
&cpu_attrs[2].attr.attr,
&dev_attr_kernel_max.attr,
&dev_attr_offline.attr,
+#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE
+ &dev_attr_modalias.attr,
+#endif
NULL
};