Checkpatch reports warnings when some specific structs are not declared as const in the code. The list of structs to consider was initially defined in the checkpatch.pl script itself, but it was later moved to an external file (scripts/const_structs.checkpatch), in commit bf1fa1dae68e ("checkpatch: externalize the structs that should be const"). This introduced two minor issues: - When file scripts/const_structs.checkpatch is not present (for example, if checkpatch is run outside of the kernel directory with the "--no-tree" option), a warning is printed to stderr to tell the user that "No structs that should be const will be found". This is fair, but the warning is printed unconditionally, even if the option "--ignore CONST_STRUCT" is passed. In the latter case, we explicitly ask checkpatch to skip this check, so no warning should be printed. - When scripts/const_structs.checkpatch is missing, or even when trying to silence the warning by adding an empty file, $const_structs is set to "", and the regex used for finding structs that should be const, "$line =~ /struct\s+($const_structs)(?!\s*\{)/)", matches all structs found in the code, thus reporting a number of false positives. Let's fix the first item by skipping scripts/const_structs.checkpatch processing if "CONST_STRUCT" checks are ignored, and the second one by skipping the test if $const_structs is not defined. Since we modify the read_words() function a little bit, update the checks for $typedefsfile/$typeOtherTypedefs as well.
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| @@ -59,7 +59,7 @@ my $spelling_file = "$D/spelling.txt"; · 58 unmodified lines | ||
| 59 | 59 | my $codespell = 0; |
| 60 | 60 | my $codespellfile = "/usr/share/codespell/dictionary.txt"; |
| 61 | 61 | my $conststructsfile = "$D/const_structs.checkpatch"; |
| 62 | −my $typedefsfile = ""; | |
| 62 | +my $typedefsfile; | |
| 63 | 63 | my $color = "auto"; |
| 64 | 64 | my $allow_c99_comments = 1; # Can be overridden by --ignore C99_COMMENT_TOLERANCE |
| 65 | 65 | # git output parsing needs US English output, so first set backtick child process LANGUAGE |
| @@ -756,7 +756,7 @@ sub read_words { · 690 unmodified lines | ||
| 756 | 756 | next; |
| 757 | 757 | } |
| 758 | 758 | |
| 759 | − $$wordsRef .= '|' if ($$wordsRef ne ""); | |
| 759 | + $$wordsRef .= '|' if (defined $$wordsRef); | |
| 760 | 760 | $$wordsRef .= $line; |
| 761 | 761 | } |
| 762 | 762 | close($file); |
| @@ -766,16 +766,18 @@ sub read_words { · 3 unmodified lines | ||
| 766 | 766 | return 0; |
| 767 | 767 | } |
| 768 | 768 | |
| 769 | −my $const_structs = ""; | |
| 770 | −read_words(\$const_structs, $conststructsfile) | |
| 771 | − or warn "No structs that should be const will be found - file '$conststructsfile': $!\n"; | |
| 769 | +my $const_structs; | |
| 770 | +if (show_type("CONST_STRUCT")) { | |
| 771 | + read_words(\$const_structs, $conststructsfile) | |
| 772 | + or warn "No structs that should be const will be found - file '$conststructsfile': $!\n"; | |
| 773 | +} | |
| 772 | 774 | |
| 773 | −my $typeOtherTypedefs = ""; | |
| 774 | −if (length($typedefsfile)) { | |
| 775 | +if (defined($typedefsfile)) { | |
| 776 | + my $typeOtherTypedefs; | |
| 775 | 777 | read_words(\$typeOtherTypedefs, $typedefsfile) |
| 776 | 778 | or warn "No additional types will be considered - file '$typedefsfile': $!\n"; |
| 779 | + $typeTypedefs .= '|' . $typeOtherTypedefs if (defined $typeOtherTypedefs); | |
| 777 | 780 | } |
| 778 | −$typeTypedefs .= '|' . $typeOtherTypedefs if ($typeOtherTypedefs ne ""); | |
| 779 | 781 | |
| 780 | 782 | sub build_types { |
| 781 | 783 | my $mods = "(?x: \n" . join("|\n ", (@modifierList, @modifierListFile)) . "\n)"; |
| @@ -6643,7 +6645,8 @@ sub process { · 5861 unmodified lines | ||
| 6643 | 6645 | |
| 6644 | 6646 | # check for various structs that are normally const (ops, kgdb, device_tree) |
| 6645 | 6647 | # and avoid what seem like struct definitions 'struct foo {' |
| 6646 | − if ($line !~ /\bconst\b/ && | |
| 6648 | + if (defined($const_structs) && | |
| 6649 | + $line !~ /\bconst\b/ && | |
| 6647 | 6650 | $line =~ /\bstruct\s+($const_structs)\b(?!\s*\{)/) { |
| 6648 | 6651 | WARN("CONST_STRUCT", |
| 6649 | 6652 | "struct $1 should normally be const\n" . $herecurr); |