checkpatch: suspect indent -- skip over preprocessor, label and blank lines

We should skip over and check the lines which follow preprocessor
statements, labels, and blank lines.  These all have legitimate reasons to
be indented differently.
Signed-off-by: NAndy Whitcroft <apw@shadowen.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

scripts/checkpatch.pl

@@ -1434,7 +1434,7 @@ sub process {
 			if ($s =~ s/^\s*\\//) {
 				$continuation = 1;
 			}
-			if ($s =~ s/^\s*\n//) {
+			if ($s =~ s/^\s*?\n//) {
 				$check = 1;
 				$cond_lines++;
 			}
@@ -1446,15 +1446,20 @@ sub process {
 				$check = 0;
 			}
 
-			# Ignore the current line if its is a preprocessor
-			# line.
-			if ($s =~ /^\s*#\s*/) {
-				$check = 0;
-			}
+			my $cond_ptr = -1;
+			while ($cond_ptr != $cond_lines) {
+				$cond_ptr = $cond_lines;
 
-			# Ignore the current line if it is label.
-			if ($s =~ /^\s*$Ident\s*:/) {
-				$check = 0;
+				# Ignore:
+				#  1) blank lines, they should be at 0,
+				#  2) preprocessor lines, and
+				#  3) labels.
+				if ($s =~ /^\s*?\n/ ||
+				    $s =~ /^\s*#\s*?/ ||
+				    $s =~ /^\s*$Ident\s*:/) {
+					$s =~ s/^.*?\n//;
+					$cond_lines++;
+				}
 			}
 
 			my (undef, $sindent) = line_stats("+" . $s);
@@ -1470,7 +1475,7 @@ sub process {
 				$stat_real = "[...]\n$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";
+			#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 ''))) {