-add documentation about pr_debug kernel-parameters.txt

Signed-off-by: Jason Baron <jbaron@redhat.com>
---

 Documentation/kernel-parameters.txt |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)


diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index cf38689..6d524bb 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1494,6 +1494,11 @@ and is between 256 and 4096 characters. It is defined in the file
 			autoconfiguration.
 			Ranges are in pairs (memory base and size).
 
+	pr_debug
+			Enables pr_debug() calls if the immediate
+			infrastructure has been enabled. These can also be
+			switched on/off via /proc/sys/debug/pr_debug.
+
 	print-fatal-signals=
 			[KNL] debug: print fatal signals
 			print-fatal-signals=1: print segfault info to
--
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