checkpatch: add check for keyword 'boolean' in Kconfig definitions

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

See http://lkml.kernel.org/r/[email protected]

Signed-off-by: Christoph Jaeger <[email protected]>
Suggested-by: Daniel Borkmann <[email protected]>
Cc: Joe Perches <[email protected]>
Acked-by: Paul Bolle <[email protected]>
Tested-by: Paul Bolle <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

1 files changed, 7 insertions, 0 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index f130c93a5656..6afc24ba77a6 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2357,6 +2357,13 @@ 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;