[ACPI] document processor.nocst parameter

Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 5dffcfefc3c7..6e9f1dc26884 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1160,6 +1160,10 @@ running once the system is up.
                         Limit processor to maximum C-state
                         max_cstate=9 overrides any DMI blacklist limit.
 
+        processor.nocst [HW,ACPI]
+                        Ignore the _CST method to determine C-states,
+                        instead using the legacy FADT method
+
         prompt_ramdisk= [RAM] List of RAM disks to prompt for floppy disk
                         before loading.
                         See Documentation/ramdisk.txt.