[PATCH] checkpatch: Look for Kconfig indentation errors

[Krzysztof Kozlowski <krzk@kernel.org>]

Kconfig should be indented with one tab for first level and tab+2 spaces
for second level.  There are many mixups of this so add a checkpatch
rule.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
---
 scripts/checkpatch.pl | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index e41f4adcc1be..875e862cf076 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3046,6 +3046,13 @@ sub process {
 			     "Use of boolean is deprecated, please use bool instead.\n" . $herecurr);
 		}
 
+# Kconfig has special indentation
+		if ($realfile =~ /Kconfig/ &&
+		    ($rawline =~ /^\+ +\t* *[a-zA-Z-]/) || ($rawline =~ /^\+\t( |   )[a-zA-Z-]/)) {
+			WARN("CONFIG_INDENTATION",
+			     "Kconfig uses one tab indentation, optionally followed by two spaces.\n" . $herecurr);
+		}
+
 		if (($realfile =~ /Makefile.*/ || $realfile =~ /Kbuild.*/) &&
 		    ($line =~ /\+(EXTRA_[A-Z]+FLAGS).*/)) {
 			my $flag = $1;
-- 
2.7.4