[PATCH v2 1/2] docs: document the sysfs ABI for "nohz_full"

[Kohei Tarumizu]

Add missing documentation of sysfs ABI for "nohz_full". It was added
by commit 6570a9a1ce3a("show nohz_full cpus in sysfs"). However,
there is no documentation for these interface.

Signed-off-by: Kohei Tarumizu <tarumizu.kohei@xxxxxxxxxxx>
---
 Documentation/ABI/testing/sysfs-devices-system-cpu | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
index 69c65da16dff..f84c32f0bdf6 100644
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -666,3 +666,10 @@ Description:	Preferred MTE tag checking mode
 		================  ==============================================
 
 		See also: Documentation/arm64/memory-tagging-extension.rst
+
+What:		/sys/devices/system/cpu/nohz_full
+Date:		Apr 2015
+Contact:	Linux kernel mailing list <linux-kernel@xxxxxxxxxxxxxxx>
+Description:
+		(RO) the list of CPUs that are in nohz_full mode.
+		These CPUs are set by boot parameter "nohz_full=".
-- 
2.27.0