checkpatch: add --strict tests for braces, comments and casts

Add some more subjective --strict tests.

Add a test for block comments that start with a blank line followed only
by a line with just the comment block initiator.  Prefer a blank line
followed by /* comment...

Add a test for unnecessary spaces after a cast.

Add a test for symmetric uses of braces in if/else blocks.
If one branch needs braces, then all branches should use braces.

Signed-off-by: Joe Perches <joe@perches.com>
Cc: Andy Whitcroft <apw@shadowen.org>
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 07d7184..21486c0 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1849,6 +1849,17 @@ sub process {
                        }
                }
 
+               if ($line =~ /^\+.*\*[ \t]*\)[ \t]+/) {
+                       CHK("SPACING",
+                           "No space is necessary after a cast\n" . $hereprev);
+               }
+
+               if ($rawline =~ /^\+[ \t]*\/\*[ \t]*$/ &&
+                   $prevrawline =~ /^\+[ \t]*$/) {
+                       CHK("BLOCK_COMMENT_STYLE",
+                           "Don't begin block comments with only a /* line, use /* comment...\n" . $hereprev);
+               }
+
 # check for spaces at the beginning of a line.
 # Exceptions:
 #  1) within comments
@@ -2961,7 +2972,8 @@ sub process {
                        #print "chunks<$#chunks> linenr<$linenr> endln<$endln> level<$level>\n";
                        #print "APW: <<$chunks[1][0]>><<$chunks[1][1]>>\n";
                        if ($#chunks > 0 && $level == 0) {
-                               my $allowed = 0;
+                               my @allowed = ();
+                               my $allow = 0;
                                my $seen = 0;
                                my $herectx = $here . "\n";
                                my $ln = $linenr - 1;
@@ -2972,6 +2984,7 @@ sub process {
                                        my ($whitespace) = ($cond =~ /^((?:\s*\n[+-])*\s*)/s);
                                        my $offset = statement_rawlines($whitespace) - 1;
 
+                                       $allowed[$allow] = 0;
                                        #print "COND<$cond> whitespace<$whitespace> offset<$offset>\n";
 
                                        # We have looked at and allowed this specific line.
@@ -2984,23 +2997,34 @@ sub process {
 
                                        $seen++ if ($block =~ /^\s*{/);
 
-                                       #print "cond<$cond> block<$block> allowed<$allowed>\n";
+                                       #print "cond<$cond> block<$block> allowed<$allowed[$allow]>\n";
                                        if (statement_lines($cond) > 1) {
                                                #print "APW: ALLOWED: cond<$cond>\n";
-                                               $allowed = 1;
+                                               $allowed[$allow] = 1;
                                        }
                                        if ($block =~/\b(?:if|for|while)\b/) {
                                                #print "APW: ALLOWED: block<$block>\n";
-                                               $allowed = 1;
+                                               $allowed[$allow] = 1;
                                        }
                                        if (statement_block_size($block) > 1) {
                                                #print "APW: ALLOWED: lines block<$block>\n";
-                                               $allowed = 1;
+                                               $allowed[$allow] = 1;
                                        }
+                                       $allow++;
                                }
-                               if ($seen && !$allowed) {
-                                       WARN("BRACES",
-                                            "braces {} are not necessary for any arm of this statement\n" . $herectx);
+                               if ($seen) {
+                                       my $sum_allowed = 0;
+                                       foreach (@allowed) {
+                                               $sum_allowed += $_;
+                                       }
+                                       if ($sum_allowed == 0) {
+                                               WARN("BRACES",
+                                                    "braces {} are not necessary for any arm of this statement\n" . $herectx);
+                                       } elsif ($sum_allowed != $allow &&
+                                                $seen != $allow) {
+                                               CHK("BRACES",
+                                                   "braces {} should be used on all arms of this statement\n" . $herectx);
+                                       }
                                }
                        }
                }