checkpatch: improve the SUSPECT_CODE_INDENT test

The current SUSPECT_CODE_INDENT test does not recognize several
defective code style defects where code following a logical test is
inappropriately indented.

Before this patch, for code like:

	if (foo)
	bar();

checkpatch would not emit a warning.

Improve the test to warn when code after a logical test has the same
indentation as the logical test.

Perform the same indentation test for "else" blocks too.

Link: http://lkml.kernel.org/r/df2374b68c4a68af2b7ef08afe486584811f610a.1493683942.git.joe@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 33740404cd9e8516c7583495c8e31fb66fa3a60f..4b9569fa931b90200a2c809598fe3765b157fbb7 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3354,7 +3354,7 @@ sub process {
                }
 
 # Check relative indent for conditionals and blocks.
-               if ($line =~ /\b(?:(?:if|while|for|(?:[a-z_]+|)for_each[a-z_]+)\s*\(|do\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) {
+               if ($line =~ /\b(?:(?:if|while|for|(?:[a-z_]+|)for_each[a-z_]+)\s*\(|(?:do|else)\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) {
                        ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
                                ctx_statement_block($linenr, $realcnt, 0)
                                        if (!defined $stat);
@@ -3446,6 +3446,8 @@ sub process {
                        if ($check && $s ne '' &&
                            (($sindent % 8) != 0 ||
                             ($sindent < $indent) ||
+                            ($sindent == $indent &&
+                             ($s !~ /^\s*(?:\}|\{|else\b)/)) ||
                             ($sindent > $indent + 8))) {
                                WARN("SUSPECT_CODE_INDENT",
                                     "suspect code indent for conditional statements ($indent, $sindent)\n" . $herecurr . "$stat_real\n");