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Diffstat (limited to '')
| -rw-r--r-- | debian/patches-rt/0050-sysfs-Add-sys-kernel-realtime-entry.patch | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/debian/patches-rt/0050-sysfs-Add-sys-kernel-realtime-entry.patch b/debian/patches-rt/0050-sysfs-Add-sys-kernel-realtime-entry.patch new file mode 100644 index 000000000..bebe5bd1b --- /dev/null +++ b/debian/patches-rt/0050-sysfs-Add-sys-kernel-realtime-entry.patch @@ -0,0 +1,55 @@ +From b2103f830327ab5d1e6f49134c22d3c5adfb52cc Mon Sep 17 00:00:00 2001 +From: Clark Williams <williams@redhat.com> +Date: Sat, 30 Jul 2011 21:55:53 -0500 +Subject: [PATCH 50/62] sysfs: Add /sys/kernel/realtime entry +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.1/older/patches-6.1.69-rt21.tar.xz + +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(+) + +diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c +index 65dba9076f31..ab18048e2186 100644 +--- a/kernel/ksysfs.c ++++ b/kernel/ksysfs.c +@@ -142,6 +142,15 @@ 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) +@@ -232,6 +241,9 @@ 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 + }; +-- +2.43.0 + |