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sysfs: Add /sys/kernel/realtime entry

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Add a /sys/kernel entry to indicate that the kernel is a
realtime kernel.

Clark says that he needs this for udev rules, udev needs to evaluate
if its a PREEMPT_RT kernel a few thousand times and parsing uname
output is too slow or so.

Are there better solutions? Should it exist and return 0 on !-rt?

Signed-off-by: Clark Williams <williams@redhat.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
This commit is contained in:
Clark Williams 2011-07-30 21:55:53 -05:00 committed by a@b.com
parent 00504b051a
commit fce6b66466
1 changed files with 12 additions and 0 deletions
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12
kernel/ksysfs.c
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@ -138,6 +138,15 @@ KERNEL_ATTR_RO(vmcoreinfo);
#endif /* CONFIG_CRASH_CORE */
#if defined(CONFIG_PREEMPT_RT)
static ssize_t realtime_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
return sprintf(buf, "%d\n", 1);
}
KERNEL_ATTR_RO(realtime);
#endif
/* whether file capabilities are enabled */
static ssize_t fscaps_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
@ -228,6 +237,9 @@ static struct attribute * kernel_attrs[] = {
#ifndef CONFIG_TINY_RCU
&rcu_expedited_attr.attr,
&rcu_normal_attr.attr,
#endif
#ifdef CONFIG_PREEMPT_RT
&realtime_attr.attr,
#endif
NULL
};