Behavior of THP can either be toggled through sysfs in runtime or using a 
kernel cmdline parameter 'transparent_hugepage='. Document the latter.

Signed-off-by: Jiri Kosina <redacted>
---
 Documentation/kernel-parameters.txt |    7 +++++++
 Documentation/vm/transhuge.txt      |    3 +++
 2 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 033d4e6..a4de9b9 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt

@@ -2629,6 +2629,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 			to facilitate early boot debugging.
 			See also Documentation/trace/events.txt
 
+	transparent_hugepage=
+			[KNL]
+			Format: [always|madvise|never]
+			Can be used to control the default behavior of the system
+			with respect to transparent hugepages.
+			See Documentation/vm/transhuge.txt for more details.
+
 	tsc=		Disable clocksource stability checks for TSC.
 			Format: <string>
 			[x86] reliable: mark tsc clocksource as reliable, this

diff --git a/Documentation/vm/transhuge.txt b/Documentation/vm/transhuge.txt
index 29bdf62..4a3816d 100644
--- a/Documentation/vm/transhuge.txt
+++ b/Documentation/vm/transhuge.txt

@@ -103,6 +103,9 @@ echo always >/sys/kernel/mm/transparent_hugepage/enabled
 echo madvise >/sys/kernel/mm/transparent_hugepage/enabled
 echo never >/sys/kernel/mm/transparent_hugepage/enabled
 
+The always/madvise/never value can also be specified on the kernel boot
+commandline using 'transparent_hugepage=' parameter.
+
 It's also possible to limit defrag efforts in the VM to generate