summaryrefslogtreecommitdiffstats
path: root/scripts/checkpatch.pl
diff options
context:
space:
mode:
Diffstat (limited to 'scripts/checkpatch.pl')
-rw-r--r--scripts/checkpatch.pl595
1 files changed, 595 insertions, 0 deletions
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
new file mode 100644
index 000000000000..e216d49624b7
--- /dev/null
+++ b/scripts/checkpatch.pl
@@ -0,0 +1,595 @@
+#!/usr/bin/perl -w
+# (c) 2001, Dave Jones. <davej@codemonkey.org.uk> (the file handling bit)
+# (c) 2005, Joel Scohpp <jschopp@austin.ibm.com> (the ugly bit)
+# (c) 2007, Andy Whitcroft <apw@uk.ibm.com> (new conditions, test suite, etc)
+# Licensed under the terms of the GNU GPL License version 2
+
+use strict;
+
+my $P = $0;
+
+my $V = '0.01';
+
+use Getopt::Long qw(:config no_auto_abbrev);
+
+my $quiet = 0;
+my $tree = 1;
+my $chk_signoff = 1;
+my $chk_patch = 1;
+GetOptions(
+ 'q|quiet' => \$quiet,
+ 'tree!' => \$tree,
+ 'signoff!' => \$chk_signoff,
+ 'patch!' => \$chk_patch,
+) or exit;
+
+my $exit = 0;
+
+if ($#ARGV < 0) {
+ print "usage: patchstylecheckemail.pl [options] patchfile\n";
+ print "version: $V\n";
+ print "options: -q => quiet\n";
+ print " --no-tree => run without a kernel tree\n";
+ exit(1);
+}
+
+if ($tree && !top_of_kernel_tree()) {
+ print "Must be run from the top-level dir. of a kernel tree\n";
+ exit(2);
+}
+
+my @deprecated = ();
+my $removal = 'Documentation/feature-removal-schedule.txt';
+if ($tree && -f $removal) {
+ open(REMOVE, "<$removal") || die "$P: $removal: open failed - $!\n";
+ while (<REMOVE>) {
+ if (/^Files:\s+(.*\S)/) {
+ for my $file (split(/[, ]+/, $1)) {
+ if ($file =~ m@include/(.*)@) {
+ push(@deprecated, $1);
+ }
+ }
+ }
+ }
+}
+
+my @lines = ();
+while (<>) {
+ chomp;
+ push(@lines, $_);
+ if (eof(ARGV)) {
+ if (!process($ARGV, @lines)) {
+ $exit = 1;
+ }
+ @lines = ();
+ }
+}
+
+exit($exit);
+
+sub top_of_kernel_tree {
+ if ((-f "COPYING") && (-f "CREDITS") && (-f "Kbuild") &&
+ (-f "MAINTAINERS") && (-f "Makefile") && (-f "README") &&
+ (-d "Documentation") && (-d "arch") && (-d "include") &&
+ (-d "drivers") && (-d "fs") && (-d "init") && (-d "ipc") &&
+ (-d "kernel") && (-d "lib") && (-d "scripts")) {
+ return 1;
+ }
+ return 0;
+}
+
+sub expand_tabs {
+ my ($str) = @_;
+
+ my $res = '';
+ my $n = 0;
+ for my $c (split(//, $str)) {
+ if ($c eq "\t") {
+ $res .= ' ';
+ $n++;
+ for (; ($n % 8) != 0; $n++) {
+ $res .= ' ';
+ }
+ next;
+ }
+ $res .= $c;
+ $n++;
+ }
+
+ return $res;
+}
+
+sub cat_vet {
+ my ($vet) = @_;
+
+ $vet =~ s/\t/^I/;
+ $vet =~ s/$/\$/;
+
+ return $vet;
+}
+
+sub process {
+ my $filename = shift;
+ my @lines = @_;
+
+ my $linenr=0;
+ my $prevline="";
+ my $stashline="";
+
+ my $lineforcounting='';
+ my $indent;
+ my $previndent=0;
+ my $stashindent=0;
+
+ my $clean = 1;
+ my $signoff = 0;
+ my $is_patch = 0;
+
+ # Trace the real file/line as we go.
+ my $realfile = '';
+ my $realline = 0;
+ my $realcnt = 0;
+ my $here = '';
+ my $in_comment = 0;
+ my $first_line = 0;
+
+ foreach my $line (@lines) {
+ $linenr++;
+
+#extract the filename as it passes
+ if ($line=~/^\+\+\+\s+(\S+)/) {
+ $realfile=$1;
+ $in_comment = 0;
+ next;
+ }
+#extract the line range in the file after the patch is applied
+ if ($line=~/^\@\@ -\d+,\d+ \+(\d+)(,(\d+))? \@\@/) {
+ $is_patch = 1;
+ $first_line = 1;
+ $in_comment = 0;
+ $realline=$1-1;
+ if (defined $2) {
+ $realcnt=$3+1;
+ } else {
+ $realcnt=1+1;
+ }
+ next;
+ }
+
+#track the line number as we move through the hunk
+ if ($line=~/^[ \+]/) {
+ $realline++;
+ $realcnt-- if ($realcnt != 0);
+
+ # track any sort of multi-line comment. Obviously if
+ # the added text or context do not include the whole
+ # comment we will not see it. Such is life.
+ #
+ # Guestimate if this is a continuing comment. If this
+ # is the start of a diff block and this line starts
+ # ' *' then it is very likely a comment.
+ if ($first_line and $line =~ m@^.\s*\*@) {
+ $in_comment = 1;
+ }
+ if ($line =~ m@/\*@) {
+ $in_comment = 1;
+ }
+ if ($line =~ m@\*/@) {
+ $in_comment = 0;
+ }
+
+ $lineforcounting = $line;
+ $lineforcounting =~ s/^\+//;
+ $lineforcounting = expand_tabs($lineforcounting);
+
+ my ($white) = ($lineforcounting =~ /^(\s*)/);
+ $indent = length($white);
+
+ # Track the previous line.
+ ($prevline, $stashline) = ($stashline, $line);
+ ($previndent, $stashindent) = ($stashindent, $indent);
+ $first_line = 0;
+ }
+
+#make up the handle for any error we report on this line
+ $here = "PATCH: $ARGV:$linenr:";
+ $here .= "\nFILE: $realfile:$realline:" if ($realcnt != 0);
+
+ my $herecurr = "$here\n$line\n\n";
+ my $hereprev = "$here\n$prevline\n$line\n\n";
+
+#check the patch for a signoff:
+ if ($line =~ /^\s*Signed-off-by:\s/) {
+ $signoff++;
+
+ } elsif ($line =~ /^\s*signed-off-by:/i) {
+ if (!($line =~ /^\s*Signed-off-by:/)) {
+ print "use Signed-off-by:\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+ if ($line =~ /^\s*signed-off-by:\S/i) {
+ print "need space after Signed-off-by:\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+ }
+
+#ignore lines not being added
+ if ($line=~/^[^\+]/) {next;}
+
+# check we are in a valid source file *.[hcsS] if not then ignore this hunk
+ next if ($realfile !~ /\.[hcsS]$/);
+
+#trailing whitespace
+ if ($line=~/\S\s+$/) {
+ my $herevet = "$here\n" . cat_vet($line) . "\n\n";
+ print "trailing whitespace\n";
+ print "$herevet";
+ $clean = 0;
+ }
+#80 column limit
+ if (!($prevline=~/\/\*\*/) && length($lineforcounting) > 80) {
+ print "line over 80 characters\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+
+# check we are in a valid source file *.[hc] if not then ignore this hunk
+ next if ($realfile !~ /\.[hc]$/);
+
+# at the beginning of a line any tabs must come first and anything
+# more than 8 must use tabs.
+ if ($line=~/^\+\s* \t\s*\S/ or $line=~/^\+\s* \s*/) {
+ my $herevet = "$here\n" . cat_vet($line) . "\n\n";
+ print "use tabs not spaces\n";
+ print "$herevet";
+ $clean = 0;
+ }
+
+ #
+ # The rest of our checks refer specifically to C style
+ # only apply those _outside_ comments.
+ #
+ next if ($in_comment);
+
+# no C99 // comments
+ if ($line =~ m@//@ and !($line =~ m@\".*//.*\"@)) {
+ print "do not use C99 // comments\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+
+ # Remove comments from the line before processing.
+ $line =~ s@/\*.*\*/@@g;
+ $line =~ s@/\*.*@@;
+ $line =~ s@.*\*/@@;
+ $line =~ s@//.*@@;
+
+#EXPORT_SYMBOL should immediately follow its function closing }.
+ if (($line =~ /EXPORT_SYMBOL.*\(.*\)/) ||
+ ($line =~ /EXPORT_UNUSED_SYMBOL.*\(.*\)/)) {
+ if (($prevline !~ /^}/) &&
+ ($prevline !~ /^\+}/) &&
+ ($prevline !~ /^ }/)) {
+ print "EXPORT_SYMBOL(func); should immediately follow its function\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+ }
+
+ # check for static initialisers.
+ if ($line=~/\s*static\s.*=\s+(0|NULL);/) {
+ print "do not initialise statics to 0 or NULL\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+
+ # check for new typedefs.
+ if ($line=~/\s*typedef\s/) {
+ print "do not add new typedefs\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+
+# * goes on variable not on type
+ if ($line=~/[A-Za-z\d_]+\* [A-Za-z\d_]+/) {
+ print "\"foo* bar\" should be \"foo *bar\"\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+
+# # no BUG() or BUG_ON()
+# if ($line =~ /\b(BUG|BUG_ON)\b/) {
+# print "Try to use WARN_ON & Recovery code rather than BUG() or BUG_ON()\n";
+# print "$herecurr";
+# $clean = 0;
+# }
+
+# printk should use KERN_* levels
+ if ($line =~ /\bprintk\((?!KERN_)/) {
+ print "printk() should include KERN_ facility level\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+
+#function brace can't be on same line, except for #defines of do while, or if closed on same line
+ if (($line=~/[A-Za-z\d_]+\**\s+\**[A-Za-z\d_]+\(.*\).* {/) and
+ !($line=~/\#define.*do\s{/) and !($line=~/}/)) {
+ print "braces following function declarations go on the next line\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+ my $opline = $line;
+ $opline =~ s/^.//;
+ if (!($line=~/\#\s*include/)) {
+ # Check operator spacing.
+ my @elements = split(/(<<=|>>=|<=|>=|==|!=|\+=|-=|\*=|\/=|%=|\^=|\|=|&=|->|<<|>>|<|>|=|!|~|&&|\|\||,|\^|\+\+|--|;|&|\||\+|-|\*|\/\/|\/)/, $opline);
+ for (my $n = 0; $n < $#elements; $n += 2) {
+ # $wN says we have white-space before or after
+ # $sN says we have a separator before or after
+ # $oN says we have another operator before or after
+ my $w1 = $elements[$n] =~ /\s$/;
+ my $s1 = $elements[$n] =~ /(\[|\(|\s)$/;
+ my $o1 = $elements[$n] eq '';
+ my $op = $elements[$n + 1];
+ my $w2 = 1;
+ my $s2 = 1;
+ my $o2 = 0;
+ # If we have something after the operator handle it.
+ if (defined $elements[$n + 2]) {
+ $w2 = $elements[$n + 2] =~ /^\s/;
+ $s2 = $elements[$n + 2] =~ /^(\s|\)|\]|;)/;
+ $o2 = $elements[$n + 2] eq '';
+ }
+
+ # Generate the context.
+ my $at = "here: ";
+ for (my $m = $n; $m >= 0; $m--) {
+ if ($elements[$m] ne '') {
+ $at .= $elements[$m];
+ last;
+ }
+ }
+ $at .= $op;
+ for (my $m = $n + 2; defined $elements[$m]; $m++) {
+ if ($elements[$m] ne '') {
+ $at .= $elements[$m];
+ last;
+ }
+ }
+
+ ##print "<$s1:$op:$s2> <$elements[$n]:$elements[$n + 1]:$elements[$n + 2]>\n";
+ # Skip things apparently in quotes.
+ next if ($line=~/\".*\Q$op\E.*\"/ or $line=~/\'\Q$op\E\'/);
+
+ # We need ; as an operator. // is a comment.
+ if ($op eq ';' or $op eq '//') {
+
+ # -> should have no spaces
+ } elsif ($op eq '->') {
+ if ($s1 or $s2) {
+ print "no spaces around that '$op' $at\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+
+ # , must have a space on the right.
+ } elsif ($op eq ',') {
+ if (!$s2) {
+ print "need space after that '$op' $at\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+
+ # unary ! and unary ~ are allowed no space on the right
+ } elsif ($op eq '!' or $op eq '~') {
+ if (!$s1 && !$o1) {
+ print "need space before that '$op' $at\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+ if ($s2) {
+ print "no space after that '$op' $at\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+
+ # unary ++ and unary -- are allowed no space on one side.
+ } elsif ($op eq '++' or $op eq '--') {
+ if (($s1 && $s2) || ((!$s1 && !$o1) && (!$s2 && !$o2))) {
+ print "need space one side of that '$op' $at\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+
+ # & is both unary and binary
+ # unary:
+ # a &b
+ # binary (consistent spacing):
+ # a&b OK
+ # a & b OK
+ #
+ # boiling down to: if there is a space on the right then there
+ # should be one on the left.
+ #
+ # - is the same
+ #
+ # * is the same only adding:
+ # type:
+ # (foo *)
+ # (foo **)
+ #
+ } elsif ($op eq '&' or $op eq '-' or $op eq '*') {
+ if ($w2 and !$w1) {
+ print "need space before that '$op' $at\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+
+ # << and >> may either have or not have spaces both sides
+ } elsif ($op eq '<<' or $op eq '>>' or $op eq '+' or $op eq '/' or
+ $op eq '^' or $op eq '|')
+ {
+ if ($s1 != $s2) {
+ print "need consistent spacing around '$op' $at\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+
+ # All the others need spaces both sides.
+ } elsif (!$s1 or !$s2) {
+ print "need spaces around that '$op' $at\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+ }
+ }
+
+#need space before brace following if, while, etc
+ if ($line=~/\(.*\){/) {
+ print "need a space before the brace\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+
+#goto labels aren't indented, allow a single space however
+ if ($line=~/^.\s+[A-Za-z\d_]+:/ and
+ !($line=~/^. [A-Za-z\d_]+:/) and !($line=~/^.\s+default:/)) {
+ print "labels should not be indented\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+
+# Need a space before open parenthesis after if, while etc
+ if ($line=~/(if|while|for|switch)\(/) {
+ print "need a space before the open parenthesis\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+
+# Check for illegal assignment in if conditional.
+ if ($line=~/(if|while)\s*\(.*[^<>!=]=[^=].*\)/) {
+ print "do not use assignment in if condition\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+
+ # Check for }<nl>else {, these must be at the same
+ # indent level to be relevant to each other.
+ if ($prevline=~/}\s*$/ and $line=~/^.\s*else\s*/ and
+ $previndent == $indent) {
+ print "else should follow close brace\n";
+ print "$hereprev";
+ $clean = 0;
+ }
+
+ # Check for switch () {<nl>case, these must be at the
+ # same indent. We will only catch the first one, as our
+ # context is very small but people tend to be consistent
+ # so we will catch them out more often than not.
+ if ($prevline=~/\s*switch\s*\(.*\)/ and $line=~/\s*case\s+/
+ and $previndent != $indent) {
+ print "switch and case should be at the same indent\n";
+ print "$hereprev";
+ $clean = 0;
+ }
+
+#studly caps, commented out until figure out how to distinguish between use of existing and adding new
+# if (($line=~/[\w_][a-z\d]+[A-Z]/) and !($line=~/print/)) {
+# print "No studly caps, use _\n";
+# print "$herecurr";
+# $clean = 0;
+# }
+
+#no spaces allowed after \ in define
+ if ($line=~/\#define.*\\\s$/) {
+ print("Whitepspace after \\ makes next lines useless\n");
+ print "$herecurr";
+ $clean = 0;
+ }
+
+#warn if <asm/foo.h> is #included and <linux/foo.h> is available.
+ if ($tree && $line =~ qr|\s*\#\s*include\s*\<asm\/(.*)\.h\>|) {
+ my $checkfile = "include/linux/$1.h";
+ if (-f $checkfile) {
+ print "Use #include <linux/$1.h> instead of <asm/$1.h>\n";
+ print $herecurr;
+ $clean = 0;
+ }
+ }
+
+#if/while/etc brace do not go on next line, unless #defining a do while loop, or if that brace on the next line is for something else
+ if ($prevline=~/(if|while|for|switch)\s*\(/) {
+ my @opened = $prevline=~/\(/g;
+ my @closed = $prevline=~/\)/g;
+ my $nr_line = $linenr;
+ my $remaining = $realcnt;
+ my $next_line = $line;
+ my $extra_lines = 0;
+ my $display_segment = $prevline;
+
+ while ($remaining > 0 && scalar @opened > scalar @closed) {
+ $prevline .= $next_line;
+ $display_segment .= "\n" . $next_line;
+ $next_line = $lines[$nr_line];
+ $nr_line++;
+ $remaining--;
+
+ @opened = $prevline=~/\(/g;
+ @closed = $prevline=~/\)/g;
+ }
+
+ if (($prevline=~/(if|while|for|switch)\s*\(.*\)\s*$/) and ($next_line=~/{/) and
+ !($next_line=~/(if|while|for)/) and !($next_line=~/\#define.*do.*while/)) {
+ print "That { should be on the previous line\n";
+ print "$display_segment\n$next_line\n\n";
+ $clean = 0;
+ }
+ }
+
+#multiline macros should be enclosed in a do while loop
+ if (($prevline=~/\#define.*\\/) and !($prevline=~/do\s+{/) and
+ !($prevline=~/\(\{/) and ($line=~/;\s*\\/) and
+ !($line=~/do.*{/) and !($line=~/\(\{/)) {
+ print "Macros with multiple statements should be enclosed in a do - while loop\n";
+ print "$hereprev";
+ $clean = 0;
+ }
+
+# don't include deprecated include files
+ for my $inc (@deprecated) {
+ if ($line =~ m@\#\s*include\s*\<$inc>@) {
+ print "Don't use <$inc>: see Documentation/feature-removal-schedule.txt\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+ }
+
+# don't use kernel_thread()
+ if ($line =~ /\bkernel_thread\b/) {
+ print "Don't use kernel_thread(), use kthread(): see Documentation/feature-removal-schedule.txt\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+ }
+
+ if ($chk_patch && !$is_patch) {
+ $clean = 0;
+ print "Does not appear to be a unified-diff format patch\n";
+ }
+ if ($is_patch && $chk_signoff && $signoff == 0) {
+ $clean = 0;
+ print "Missing Signed-off-by: line(s)\n";
+ }
+
+ if ($clean == 1 && $quiet == 0) {
+ print "Your patch has no obvious style problems and is ready for submission.\n"
+ }
+ if ($clean == 0 && $quiet == 0) {
+ print "Your patch has style problems, please review. If any of these errors\n";
+ print "are false positives report them to the maintainer, see\n";
+ print "CHECKPATCH in MAINTAINERS.\n";
+ }
+ return $clean;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-17 07:23:22 +0000