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topology/sysfs: Hide PPIN on systems that do not support it.

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Systems that do not support a Protected Processor Identification Number
currently report:

	# cat /sys/devices/system/cpu/cpu0/topology/ppin
	0x0

which is confusing/wrong.

Add a ".is_visible" function to suppress inclusion of the ppin file.

Fixes: ab28e94419 ("topology/sysfs: Add PPIN in sysfs under cpu topology")
Signed-off-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/r/20220406220150.63855-1-tony.luck@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tony Luck 2022-04-06 15:01:50 -07:00 • committed by Greg Kroah-Hartman
parent ce522ba9ef
commit aa63a74d45
1 changed files with 12 additions and 0 deletions
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12
drivers/base/topology.c
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@ -152,9 +152,21 @@ static struct attribute *default_attrs[] = {
NULL
};
static umode_t topology_is_visible(struct kobject *kobj,
struct attribute *attr, int unused)
{
struct device *dev = kobj_to_dev(kobj);
if (attr == &dev_attr_ppin.attr && !topology_ppin(dev->id))
return 0;
return attr->mode;
}
static const struct attribute_group topology_attr_group = {
.attrs = default_attrs,
.bin_attrs = bin_attrs,
.is_visible = topology_is_visible,
.name = "topology"
};