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Subject[PATCH] Documentation: ABI: /sys/devices/system/cpu/cpu#/online
Add documentation for CPU hotplug interface.

Signed-off-by: Alex Chiang <achiang@hp.com>
---
I forgot to send this patch in the last round of documentation
updates, and wanted to send it before it gets misplaced. ;)

---
diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
index a703b9e..5aace16 100644
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -62,7 +62,6 @@ Description: CPU topology files that describe kernel limits related to
See Documentation/cputopology.txt for more information.


-
What: /sys/devices/system/cpu/cpu#/node
Date: October 2009
Contact: Linux memory management mailing list <linux-mm@kvack.org>
@@ -77,6 +76,24 @@ Description: Discover NUMA node a CPU belongs to
/sys/devices/system/cpu/cpu42/node2 -> ../../node/node2


+What: /sys/devices/system/cpu/cpu#/online
+Date: January 2006
+Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
+Description: Discover and change the online state of a CPU.
+
+ To discover the state:
+
+ cat /sys/devices/system/cpu/cpu#/online
+
+ A value of 0 indicates the CPU is offline. A value of 1
+ indicates it is online. To change the state, echo the
+ desired new state into the file:
+
+ echo [0|1] > /sys/devices/system/cpu/$cpu/online
+
+ For more information, please read Documentation/cpu-hotplug.txt
+
+
What: /sys/devices/system/cpu/cpu#/topology/core_id
/sys/devices/system/cpu/cpu#/topology/core_siblings
/sys/devices/system/cpu/cpu#/topology/core_siblings_list

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