58 lines
1.8 KiB
Diff
58 lines
1.8 KiB
Diff
From a1b31592c1c157323136e9da313d515bc1acb091 Mon Sep 17 00:00:00 2001
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Message-Id: <a1b31592c1c157323136e9da313d515bc1acb091.1601675152.git.zanussi@kernel.org>
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In-Reply-To: <5b5a156f9808b1acf1205606e03da117214549ea.1601675151.git.zanussi@kernel.org>
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References: <5b5a156f9808b1acf1205606e03da117214549ea.1601675151.git.zanussi@kernel.org>
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From: Clark Williams <williams@redhat.com>
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Date: Sat, 30 Jul 2011 21:55:53 -0500
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Subject: [PATCH 214/333] sysfs: Add /sys/kernel/realtime entry
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.148-rt64.tar.xz
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Add a /sys/kernel entry to indicate that the kernel is a
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realtime kernel.
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Clark says that he needs this for udev rules, udev needs to evaluate
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if its a PREEMPT_RT kernel a few thousand times and parsing uname
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output is too slow or so.
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Are there better solutions? Should it exist and return 0 on !-rt?
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Signed-off-by: Clark Williams <williams@redhat.com>
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Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
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---
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kernel/ksysfs.c | 12 ++++++++++++
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1 file changed, 12 insertions(+)
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diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c
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index 46ba853656f6..9a23632b6294 100644
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--- a/kernel/ksysfs.c
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+++ b/kernel/ksysfs.c
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@@ -140,6 +140,15 @@ KERNEL_ATTR_RO(vmcoreinfo);
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#endif /* CONFIG_CRASH_CORE */
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+#if defined(CONFIG_PREEMPT_RT_FULL)
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+static ssize_t realtime_show(struct kobject *kobj,
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+ struct kobj_attribute *attr, char *buf)
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+{
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+ return sprintf(buf, "%d\n", 1);
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+}
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+KERNEL_ATTR_RO(realtime);
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+#endif
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+
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/* whether file capabilities are enabled */
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static ssize_t fscaps_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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@@ -230,6 +239,9 @@ static struct attribute * kernel_attrs[] = {
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#ifndef CONFIG_TINY_RCU
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&rcu_expedited_attr.attr,
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&rcu_normal_attr.attr,
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+#endif
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+#ifdef CONFIG_PREEMPT_RT_FULL
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+ &realtime_attr.attr,
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#endif
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NULL
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};
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--
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2.17.1
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