docs: require kernel support before accepting use of it

http://www.spinics.net/lists/kernel/msg1228993.html

Signed-off-by: Sami Kerola <kerolasa@iki.fi>

diff --git a/Documentation/howto-contribute.txt b/Documentation/howto-contribute.txt
index 21deff1e5bb336eb711f09e4379396243fe5a1f0..e70467bbd51e8a998b8b41475d0fcd4585119246 100644 (file)
--- a/Documentation/howto-contribute.txt
+++ b/Documentation/howto-contribute.txt
@@ -95,3 +95,6 @@ Various notes
 
        * The util-linux does not use kernel headers for file system super
          blocks structures.
+
+       * Patches relying on features that are not in Linus' tree
+         are not accepted.