docs: document the sysfs ABI for "isolated"

Add missing documentation of sysfs ABI for "isolated". It was added by
commit 59f30abe94bf("show isolated cpus in sysfs"). However, there is
no documentation for these interface.

Signed-off-by: Kohei Tarumizu <tarumizu.kohei@fujitsu.com>
Link: https://lore.kernel.org/r/20211201115957.254224-3-tarumizu.kohei@fujitsu.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
index f84c32f0bdf6e562cdabc2f3d6eba2ea313254b5..61f5676a7429a440dd9bc0d6e919f5750ba2aa12 100644 (file)
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -673,3 +673,11 @@ Contact:   Linux kernel mailing list <linux-kernel@vger.kernel.org>
 Description:
                (RO) the list of CPUs that are in nohz_full mode.
                These CPUs are set by boot parameter "nohz_full=".
+
+What:          /sys/devices/system/cpu/isolated
+Date:          Apr 2015
+Contact:       Linux kernel mailing list <linux-kernel@vger.kernel.org>
+Description:
+               (RO) the list of CPUs that are isolated and don't
+               participate in load balancing. These CPUs are set by
+               boot parameter "isolcpus=".