[PATCH] checkpatch: add check for keyword 'boolean' in Kconfig definitions

[Christoph Jaeger <cj@linux.com>]

Discourage the use of keyword 'boolean' for type definition attributes of
config options as support for it will be dropped later on.

Reference: http://lkml.kernel.org/r/cover.1418003065.git.cj@linux.com
Suggested-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: Christoph Jaeger <cj@linux.com>
---
 scripts/checkpatch.pl | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index f0bb6d6..cae974e 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2355,6 +2355,13 @@ sub process {
 			     "Use of CONFIG_EXPERIMENTAL is deprecated. For alternatives, see https://lkml.org/lkml/2012/10/23/580\n");
 		}
 
+# discourage the use of boolean for type definition attributes of Kconfig options
+		if ($realfile =~ /Kconfig/ &&
+		    $line =~ /^\+\s*\bboolean\b/) {
+			WARN("CONFIG_TYPE_BOOLEAN",
+			     "Use of boolean is deprecated, please use bool instead.\n" . $herecurr);
+		}
+
 		if (($realfile =~ /Makefile.*/ || $realfile =~ /Kbuild.*/) &&
 		    ($line =~ /\+(EXTRA_[A-Z]+FLAGS).*/)) {
 			my $flag = $1;
-- 
2.1.0