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Date: Wed, 22 May 2013 13:26:37 +0200
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Stephen Rothwell <sfr@...b.auug.org.au>, Greg KH <greg@...ah.com>
Cc: linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
Igor Mammedov <imammedo@...hat.com>
Subject: Re: linux-next: manual merge of the driver-core tree with the pm tree
On Wednesday, May 22, 2013 02:02:13 PM Stephen Rothwell wrote:
> Hi all,
Hi Stephen,
Thanks for fixing this up!
Hi Greg,
What about merging my acpi-hotplug branch into the driver-core tree?
That would make the Linus' life easier going forward I suppose.
Thanks,
Rafael
> On Wed, 22 May 2013 13:47:41 +1000 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> >
> > Today's linux-next merge of the driver-core tree got a conflict in
> > drivers/base/cpu.c between commit 0902a9044fa5 ("Driver core: Use generic
> > offline/online for CPU offline/online") from the pm tree and commit
> > 1c4e2d70afb1 ("cpu: make sure that cpu/online file created before
> > KOBJ_ADD is emitted") from the driver-core tree.
> >
> > I fixed it up (they do some bits in common - see below) and can carry the
> > fix as necessary (no action is required).
> >
> > diff --cc drivers/base/cpu.c
> > index 7431ba6,c377673..0000000
> > --- a/drivers/base/cpu.c
> > +++ b/drivers/base/cpu.c
> > @@@ -38,39 -34,66 +38,48 @@@ static void change_cpu_under_node(struc
> > cpu->node_id = to_nid;
> > }
> >
> > -static ssize_t show_online(struct device *dev,
> > - struct device_attribute *attr,
> > - char *buf)
> > +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;
> > +
> > + cpu_hotplug_driver_lock();
> > +
> > + from_nid = cpu_to_node(cpuid);
> > + ret = cpu_up(cpuid);
> > + /*
> > + * When hot adding memory to memoryless node and enabling a cpu
> > + * on the node, node number of the cpu may internally change.
> > + */
> > + to_nid = cpu_to_node(cpuid);
> > + if (from_nid != to_nid)
> > + change_cpu_under_node(cpu, from_nid, to_nid);
> >
> > - return sprintf(buf, "%u\n", !!cpu_online(cpu->dev.id));
> > + cpu_hotplug_driver_unlock();
> > + return ret;
> > }
> >
> > -static ssize_t __ref store_online(struct device *dev,
> > - struct device_attribute *attr,
> > - const char *buf, size_t count)
> > +static int cpu_subsys_offline(struct device *dev)
> > {
> > - struct cpu *cpu = container_of(dev, struct cpu, dev);
> > - int cpuid = cpu->dev.id;
> > - int from_nid, to_nid;
> > - ssize_t ret;
> > + int ret;
> >
> > cpu_hotplug_driver_lock();
> > - switch (buf[0]) {
> > - case '0':
> > - ret = cpu_down(cpuid);
> > - if (!ret)
> > - kobject_uevent(&dev->kobj, KOBJ_OFFLINE);
> > - break;
> > - case '1':
> > - from_nid = cpu_to_node(cpuid);
> > - ret = cpu_up(cpuid);
> > -
> > - /*
> > - * When hot adding memory to memoryless node and enabling a cpu
> > - * on the node, node number of the cpu may internally change.
> > - */
> > - to_nid = cpu_to_node(cpuid);
> > - if (from_nid != to_nid)
> > - change_cpu_under_node(cpu, from_nid, to_nid);
> > -
> > - if (!ret)
> > - kobject_uevent(&dev->kobj, KOBJ_ONLINE);
> > - break;
> > - default:
> > - ret = -EINVAL;
> > - }
> > + ret = cpu_down(dev->id);
> > cpu_hotplug_driver_unlock();
> > -
> > - if (ret >= 0)
> > - ret = count;
> > return ret;
> > }
> > -static DEVICE_ATTR(online, 0644, show_online, store_online);
> >
> > + static struct attribute *hotplug_cpu_attrs[] = {
> > + &dev_attr_online.attr,
> > + NULL
> > + };
> > +
> > + static struct attribute_group hotplug_cpu_attr_group = {
> > + .attrs = hotplug_cpu_attrs,
> > + };
> > +
> > void unregister_cpu(struct cpu *cpu)
> > {
> > int logical_cpu = cpu->dev.id;
> > @@@ -102,20 -125,8 +111,19 @@@ static ssize_t cpu_release_store(struc
> > static DEVICE_ATTR(probe, S_IWUSR, NULL, cpu_probe_store);
> > static DEVICE_ATTR(release, S_IWUSR, NULL, cpu_release_store);
> > #endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
> > -
> > #endif /* CONFIG_HOTPLUG_CPU */
> >
> > +struct bus_type cpu_subsys = {
> > + .name = "cpu",
> > + .dev_name = "cpu",
> > + .match = cpu_subsys_match,
> > +#ifdef CONFIG_HOTPLUG_CPU
> > + .online = cpu_subsys_online,
> > + .offline = cpu_subsys_offline,
> > +#endif
> > +};
> > +EXPORT_SYMBOL_GPL(cpu_subsys);
> > +
> > #ifdef CONFIG_KEXEC
> > #include <linux/kexec.h>
>
> OK, after doing that I got this error:
>
> drivers/base/cpu.c:75:3: error: 'dev_attr_online' undeclared here (not in a function)
> &dev_attr_online.attr,
> ^
>
> So I applied this merge fix patch:
>
> diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
> index 811bb5a..ff97614 100644
> --- a/drivers/base/cpu.c
> +++ b/drivers/base/cpu.c
> @@ -71,15 +71,6 @@ static int cpu_subsys_offline(struct device *dev)
> return ret;
> }
>
> -static struct attribute *hotplug_cpu_attrs[] = {
> - &dev_attr_online.attr,
> - NULL
> -};
> -
> -static struct attribute_group hotplug_cpu_attr_group = {
> - .attrs = hotplug_cpu_attrs,
> -};
> -
> void unregister_cpu(struct cpu *cpu)
> {
> int logical_cpu = cpu->dev.id;
> @@ -182,9 +173,6 @@ static const struct attribute_group *hotplugable_cpu_attr_groups[] = {
> #ifdef CONFIG_KEXEC
> &crash_note_cpu_attr_group,
> #endif
> -#ifdef CONFIG_HOTPLUG_CPU
> - &hotplug_cpu_attr_group,
> -#endif
> NULL
> };
>
> Better ideas welcome :-)
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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