checkpatch: report the real first line of all suspect indents

We are currently only reporting syspect indents if the conditional is
modified but the indent missmatch could be generated by the body changing,
make sure we catch both.  Also only report the first line of the body, and
more importantly make sure we report the raw copy of the line.  Finally
report the indent levels to make it easier to understand what is wrong.

Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

scripts/checkpatch.pl

@@ -673,6 +673,22 @@ sub ctx_has_comment {
 	return ($cmt ne '');
 }
 
+sub raw_line {
+	my ($linenr, $cnt) = @_;
+
+	my $offset = $linenr - 1;
+	$cnt++;
+
+	my $line;
+	while ($cnt) {
+		$line = $rawlines[$offset++];
+		next if (defined($line) && $line =~ /^-/);
+		$cnt--;
+	}
+
+	return $line;
+}
+
 sub cat_vet {
 	my ($vet) = @_;
 	my ($res, $coded);
@@ -1392,6 +1408,76 @@ sub process {
 			}
 		}
 
+# Check relative indent for conditionals and blocks.
+		if ($line =~ /\b(?:(?:if|while|for)\s*\(|do\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) {
+			my ($s, $c) = ($stat, $cond);
+
+			substr($s, 0, length($c), '');
+
+			# Make sure we remove the line prefixes as we have
+			# none on the first line, and are going to readd them
+			# where necessary.
+			$s =~ s/\n./\n/gs;
+
+			# Find out how long the conditional actually is.
+			my $cond_lines = 0 + $c =~ /\n/gs;
+
+			# We want to check the first line inside the block
+			# starting at the end of the conditional, so remove:
+			#  1) any blank line termination
+			#  2) any opening brace { on end of the line
+			#  3) any do (...) {
+			my $continuation = 0;
+			my $check = 0;
+			$s =~ s/^.*\bdo\b//;
+			$s =~ s/^\s*{//;
+			if ($s =~ s/^\s*\\//) {
+				$continuation = 1;
+			}
+			if ($s =~ s/^\s*\n//) {
+				$check = 1;
+				$cond_lines++;
+			}
+
+			# Also ignore a loop construct at the end of a
+			# preprocessor statement.
+			if (($prevline =~ /^.\s*#\s*define\s/ ||
+			    $prevline =~ /\\\s*$/) && $continuation == 0) {
+				$check = 0;
+			}
+
+			# Ignore the current line if its is a preprocessor
+			# line.
+			if ($s =~ /^\s*#\s*/) {
+				$check = 0;
+			}
+
+			# Ignore the current line if it is label.
+			if ($s =~ /^\s*$Ident\s*:/) {
+				$check = 0;
+			}
+
+			my (undef, $sindent) = line_stats("+" . $s);
+			my $stat_real = raw_line($linenr, $cond_lines);
+
+			# Check if either of these lines are modified, else
+			# this is not this patch's fault.
+			if (!defined($stat_real) ||
+			    $stat !~ /^\+/ && $stat_real !~ /^\+/) {
+				$check = 0;
+			}
+			if (defined($stat_real) && $cond_lines > 1) {
+				$stat_real = "[...]\n$stat_real";
+			}
+
+			##print "line<$line> prevline<$prevline> indent<$indent> sindent<$sindent> check<$check> continuation<$continuation> s<$s> cond_lines<$cond_lines> stat_real<$stat_real> stat<$stat>\n";
+
+			if ($check && (($sindent % 8) != 0 ||
+			    ($sindent <= $indent && $s ne ''))) {
+				WARN("suspect code indent for conditional statements ($indent, $sindent)\n" . $herecurr . "$stat_real\n");
+			}
+		}
+
 		# Track the 'values' across context and added lines.
 		my $opline = $line; $opline =~ s/^./ /;
 		my ($curr_values, $curr_vars) =
@@ -1869,61 +1955,6 @@ sub process {
 			}
 		}
 
-# Check relative indent for conditionals and blocks.
-		if ($line =~ /\b(?:(?:if|while|for)\s*\(|do\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) {
-			my ($s, $c) = ($stat, $cond);
-
-			substr($s, 0, length($c), '');
-
-			# Make sure we remove the line prefixes as we have
-			# none on the first line, and are going to readd them
-			# where necessary.
-			$s =~ s/\n./\n/gs;
-
-			# We want to check the first line inside the block
-			# starting at the end of the conditional, so remove:
-			#  1) any blank line termination
-			#  2) any opening brace { on end of the line
-			#  3) any do (...) {
-			my $continuation = 0;
-			my $check = 0;
-			$s =~ s/^.*\bdo\b//;
-			$s =~ s/^\s*{//;
-			if ($s =~ s/^\s*\\//) {
-				$continuation = 1;
-			}
-			if ($s =~ s/^\s*\n//) {
-				$check = 1;
-			}
-
-			# Also ignore a loop construct at the end of a
-			# preprocessor statement.
-			if (($prevline =~ /^.\s*#\s*define\s/ ||
-			    $prevline =~ /\\\s*$/) && $continuation == 0) {
-				$check = 0;
-			}
-
-			# Ignore the current line if its is a preprocessor
-			# line.
-			if ($s =~ /^\s*#\s*/) {
-				$check = 0;
-			}
-
-			# Ignore the current line if it is label.
-			if ($s =~ /^\s*$Ident\s*:/) {
-				$check = 0;
-			}
-
-			my (undef, $sindent) = line_stats("+" . $s);
-
-			##print "line<$line> prevline<$prevline> indent<$indent> sindent<$sindent> check<$check> continuation<$continuation> s<$s>\n";
-
-			if ($check && (($sindent % 8) != 0 ||
-			    ($sindent <= $indent && $s ne ''))) {
-				WARN("suspect code indent for conditional statements\n" . $herecurr);
-			}
-		}
-
 # Check for bitwise tests written as boolean
 		if ($line =~ /
 			(?: