diff options
Diffstat (limited to '')
| -rw-r--r-- | debian/patches-rt/sysfs__Add__sys_kernel_realtime_entry.patch | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/debian/patches-rt/sysfs__Add__sys_kernel_realtime_entry.patch b/debian/patches-rt/sysfs__Add__sys_kernel_realtime_entry.patch new file mode 100644 index 000000000..2e6928846 --- /dev/null +++ b/debian/patches-rt/sysfs__Add__sys_kernel_realtime_entry.patch @@ -0,0 +1,53 @@ +Subject: sysfs: Add /sys/kernel/realtime entry +From: Clark Williams <williams@redhat.com> +Date: Sat Jul 30 21:55:53 2011 -0500 +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.6/older/patches-6.6.7-rt18.tar.xz + +From: Clark Williams <williams@redhat.com> + +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> +Signed-off-by: Thomas Gleixner <tglx@linutronix.de> + + +--- + kernel/ksysfs.c | 12 ++++++++++++ + 1 file changed, 12 insertions(+) +--- +--- a/kernel/ksysfs.c ++++ b/kernel/ksysfs.c +@@ -179,6 +179,15 @@ KERNEL_ATTR_RO(crash_elfcorehdr_size); + + #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) +@@ -275,6 +284,9 @@ static struct attribute * kernel_attrs[] + &rcu_expedited_attr.attr, + &rcu_normal_attr.attr, + #endif ++#ifdef CONFIG_PREEMPT_RT ++ &realtime_attr.attr, ++#endif + NULL + }; + |