checkpatch: add an error test for no space before comma

Using code like:

    int foo , bar;

is not preferred to:

    int foo, bar;

so emit an error on this style.

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 374abf4..696254e 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3563,14 +3563,33 @@ sub process {
                                                }
                                        }
 
-                               # , must have a space on the right.
+                               # , must not have a space before and must have a space on the right.
                                } elsif ($op eq ',') {
+                                       my $rtrim_before = 0;
+                                       my $space_after = 0;
+                                       if ($ctx =~ /Wx./) {
+                                               if (ERROR("SPACING",
+                                                         "space prohibited before that '$op' $at\n" . $hereptr)) {
+                                                       $line_fixed = 1;
+                                                       $rtrim_before = 1;
+                                               }
+                                       }
                                        if ($ctx !~ /.x[WEC]/ && $cc !~ /^}/) {
                                                if (ERROR("SPACING",
                                                          "space required after that '$op' $at\n" . $hereptr)) {
-                                                       $good = $fix_elements[$n] . trim($fix_elements[$n + 1]) . " ";
                                                        $line_fixed = 1;
                                                        $last_after = $n;
+                                                       $space_after = 1;
+                                               }
+                                       }
+                                       if ($rtrim_before || $space_after) {
+                                               if ($rtrim_before) {
+                                                       $good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]);
+                                               } else {
+                                                       $good = $fix_elements[$n] . trim($fix_elements[$n + 1]);
+                                               }
+                                               if ($space_after) {
+                                                       $good .= " ";
                                                }
                                        }