Not for merge.
Make nocb toggable for a given CPU using:
/sys/devices/system/cpu/cpu*/hotplug/nocb
This is only intended for those who want to test this patchset. The real
interfaces will be cpuset/isolation and rcutorture.
Not-Signed-off-by: Frederic Weisbecker <[email protected]>
Cc: Paul E. McKenney <[email protected]>
Cc: Josh Triplett <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Mathieu Desnoyers <[email protected]>
Cc: Lai Jiangshan <[email protected]>
Cc: Joel Fernandes <[email protected]>
---
kernel/cpu.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 2371292f30b0..ac6283dcb897 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -2208,10 +2208,33 @@ static ssize_t show_cpuhp_fail(struct device *dev,
static DEVICE_ATTR(fail, 0644, show_cpuhp_fail, write_cpuhp_fail);
+static ssize_t write_nocb(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int val, ret;
+
+ ret = kstrtoint(buf, 10, &val);
+ if (ret)
+ return ret;
+
+ if (val == 0)
+ rcu_nocb_cpu_deoffload(dev->id);
+ else if (val == 1)
+ rcu_nocb_cpu_offload(dev->id);
+ else
+ return -EINVAL;
+
+ return count;
+}
+
+static DEVICE_ATTR(nocb, 0644, NULL, write_nocb);
+
static struct attribute *cpuhp_cpu_attrs[] = {
&dev_attr_state.attr,
&dev_attr_target.attr,
&dev_attr_fail.attr,
+ &dev_attr_nocb.attr,
NULL
};
--
2.25.0
