util/lint/checkpatch: Update "check for missing blank lines after declarations"

This is to reduce difference with linux v5.16.

Change-Id: I1b7bc2b4ec832f0abeda215c381856a5ec153883
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61469
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>

1 files changed, 28 insertions, 23 deletions

diff --git a/util/lint/checkpatch.pl b/util/lint/checkpatch.pl
index cc42e8fb80..5b0c307d55 100755
--- a/util/lint/checkpatch.pl
+++ b/util/lint/checkpatch.pl
@@ -3259,43 +3259,48 @@ sub process {
 		}
 
 # check for missing blank lines after declarations
-		if ($sline =~ /^\+\s+\S/ &&			#Not at char 1
-			# actual declarations
-		    ($prevline =~ /^\+\s+$Declare\s*$Ident\s*[=,;:\[]/ ||
+# (declarations must have the same indentation and not be at the start of line)
+		if (($prevline =~ /\+(\s+)\S/) && $sline =~ /^\+$1\S/) {
+			# use temporaries
+			my $sl = $sline;
+			my $pl = $prevline;
+			# remove $Attribute/$Sparse uses to simplify comparisons
+			$sl =~ s/\b(?:$Attribute|$Sparse)\b//g;
+			$pl =~ s/\b(?:$Attribute|$Sparse)\b//g;
+			if (($pl =~ /^\+\s+$Declare\s*$Ident\s*[=,;:\[]/ ||
 			# function pointer declarations
-		     $prevline =~ /^\+\s+$Declare\s*\(\s*\*\s*$Ident\s*\)\s*[=,;:\[\(]/ ||
+			     $pl =~ /^\+\s+$Declare\s*\(\s*\*\s*$Ident\s*\)\s*[=,;:\[\(]/ ||
 			# foo bar; where foo is some local typedef or #define
-		     $prevline =~ /^\+\s+$Ident(?:\s+|\s*\*\s*)$Ident\s*[=,;\[]/ ||
+			     $pl =~ /^\+\s+$Ident(?:\s+|\s*\*\s*)$Ident\s*[=,;\[]/ ||
 			# known declaration macros
-		     $prevline =~ /^\+\s+$declaration_macros/) &&
+			     $pl =~ /^\+\s+$declaration_macros/) &&
 			# for "else if" which can look like "$Ident $Ident"
-		    !($prevline =~ /^\+\s+$c90_Keywords\b/ ||
+			    !($pl =~ /^\+\s+$c90_Keywords\b/ ||
 			# other possible extensions of declaration lines
-		      $prevline =~ /(?:$Compare|$Assignment|$Operators)\s*$/ ||
+			      $pl =~ /(?:$Compare|$Assignment|$Operators)\s*$/ ||
 			# not starting a section or a macro "\" extended line
-		      $prevline =~ /(?:\{\s*|\\)$/) &&
+			      $pl =~ /(?:\{\s*|\\)$/) &&
 			# looks like a declaration
-		    !($sline =~ /^\+\s+$Declare\s*$Ident\s*[=,;:\[]/ ||
+			    !($sl =~ /^\+\s+$Declare\s*$Ident\s*[=,;:\[]/ ||
 			# function pointer declarations
-		      $sline =~ /^\+\s+$Declare\s*\(\s*\*\s*$Ident\s*\)\s*[=,;:\[\(]/ ||
+			      $sl =~ /^\+\s+$Declare\s*\(\s*\*\s*$Ident\s*\)\s*[=,;:\[\(]/ ||
 			# foo bar; where foo is some local typedef or #define
-		      $sline =~ /^\+\s+$Ident(?:\s+|\s*\*\s*)$Ident\s*[=,;\[]/ ||
+			      $sl =~ /^\+\s+$Ident(?:\s+|\s*\*\s*)$Ident\s*[=,;\[]/ ||
 			# known declaration macros
-		      $sline =~ /^\+\s+$declaration_macros/ ||
+			      $sl =~ /^\+\s+$declaration_macros/ ||
 			# start of struct or union or enum
-		      $sline =~ /^\+\s+(?:union|struct|enum|typedef)\b/ ||
+			      $sl =~ /^\+\s+(?:static\s+)?(?:const\s+)?(?:union|struct|enum|typedef)\b/ ||
 			# start or end of block or continuation of declaration
-		      $sline =~ /^\+\s+(?:$|[\{\}\.\#\"\?\:\(\[])/ ||
+			      $sl =~ /^\+\s+(?:$|[\{\}\.\#\"\?\:\(\[])/ ||
 			# bitfield continuation
-		      $sline =~ /^\+\s+$Ident\s*:\s*\d+\s*[,;]/ ||
+			      $sl =~ /^\+\s+$Ident\s*:\s*\d+\s*[,;]/ ||
 			# other possible extensions of declaration lines
-		      $sline =~ /^\+\s+\(?\s*(?:$Compare|$Assignment|$Operators)/) &&
-			# indentation of previous and current line are the same
-		    (($prevline =~ /\+(\s+)\S/) && $sline =~ /^\+$1\S/)) {
-			if (WARN("LINE_SPACING",
-				 "Missing a blank line after declarations\n" . $hereprev) &&
-			    $fix) {
-				fix_insert_line($fixlinenr, "\+");
+			      $sl =~ /^\+\s+\(?\s*(?:$Compare|$Assignment|$Operators)/)) {
+				if (WARN("LINE_SPACING",
+					 "Missing a blank line after declarations\n" . $hereprev) &&
+				    $fix) {
+					fix_insert_line($fixlinenr, "\+");
+				}
 			}
 		}