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-rwxr-xr-xscripts/checkpatch.pl329
1 files changed, 245 insertions, 84 deletions
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index e216d49624b7..914e45a63731 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -8,7 +8,7 @@ use strict;
my $P = $0;
-my $V = '0.01';
+my $V = '0.03';
use Getopt::Long qw(:config no_auto_abbrev);
@@ -38,7 +38,8 @@ if ($tree && !top_of_kernel_tree()) {
exit(2);
}
-my @deprecated = ();
+my @dep_includes = ();
+my @dep_functions = ();
my $removal = 'Documentation/feature-removal-schedule.txt';
if ($tree && -f $removal) {
open(REMOVE, "<$removal") || die "$P: $removal: open failed - $!\n";
@@ -46,9 +47,14 @@ if ($tree && -f $removal) {
if (/^Files:\s+(.*\S)/) {
for my $file (split(/[, ]+/, $1)) {
if ($file =~ m@include/(.*)@) {
- push(@deprecated, $1);
+ push(@dep_includes, $1);
}
}
+
+ } elsif (/^Funcs:\s+(.*\S)/) {
+ for my $func (split(/[, ]+/, $1)) {
+ push(@dep_functions, $func);
+ }
}
}
}
@@ -99,6 +105,97 @@ sub expand_tabs {
return $res;
}
+sub line_stats {
+ my ($line) = @_;
+
+ # Drop the diff line leader and expand tabs
+ $line =~ s/^.//;
+ $line = expand_tabs($line);
+
+ # Pick the indent from the front of the line.
+ my ($white) = ($line =~ /^(\s*)/);
+
+ return (length($line), length($white));
+}
+
+sub ctx_block_get {
+ my ($linenr, $remain, $outer) = @_;
+ my $line;
+ my $start = $linenr - 1;
+ my $end = $linenr - 1 + $remain;
+ my $blk = '';
+ my @o;
+ my @c;
+ my @res = ();
+
+ for ($line = $start; $line < $end; $line++) {
+ $blk .= $lines[$line];
+
+ @o = ($blk =~ /\{/g);
+ @c = ($blk =~ /\}/g);
+
+ if (!$outer || (scalar(@o) - scalar(@c)) == 1) {
+ push(@res, $lines[$line]);
+ }
+
+ last if (scalar(@o) == scalar(@c));
+ }
+
+ return @res;
+}
+sub ctx_block_outer {
+ my ($linenr, $remain) = @_;
+
+ return ctx_block_get($linenr, $remain, 1);
+}
+sub ctx_block {
+ my ($linenr, $remain) = @_;
+
+ return ctx_block_get($linenr, $remain, 0);
+}
+
+sub ctx_locate_comment {
+ my ($first_line, $end_line) = @_;
+
+ # Catch a comment on the end of the line itself.
+ my ($current_comment) = ($lines[$end_line - 1] =~ m@.*(/\*.*\*/)\s*$@);
+ return $current_comment if (defined $current_comment);
+
+ # Look through the context and try and figure out if there is a
+ # comment.
+ my $in_comment = 0;
+ $current_comment = '';
+ for (my $linenr = $first_line; $linenr < $end_line; $linenr++) {
+ my $line = $lines[$linenr - 1];
+ ##warn " $line\n";
+ if ($linenr == $first_line and $line =~ m@^.\s*\*@) {
+ $in_comment = 1;
+ }
+ if ($line =~ m@/\*@) {
+ $in_comment = 1;
+ }
+ if (!$in_comment && $current_comment ne '') {
+ $current_comment = '';
+ }
+ $current_comment .= $line . "\n" if ($in_comment);
+ if ($line =~ m@\*/@) {
+ $in_comment = 0;
+ }
+ }
+
+ chomp($current_comment);
+ return($current_comment);
+}
+sub ctx_has_comment {
+ my ($first_line, $end_line) = @_;
+ my $cmt = ctx_locate_comment($first_line, $end_line);
+
+ ##print "LINE: $lines[$end_line - 1 ]\n";
+ ##print "CMMT: $cmt\n";
+
+ return ($cmt ne '');
+}
+
sub cat_vet {
my ($vet) = @_;
@@ -108,6 +205,10 @@ sub cat_vet {
return $vet;
}
+sub has_non_quoted {
+ return ($_[0] =~ m{$_[1]} and $_[0] !~ m{\".*$_[1].*\"});
+}
+
sub process {
my $filename = shift;
my @lines = @_;
@@ -116,7 +217,7 @@ sub process {
my $prevline="";
my $stashline="";
- my $lineforcounting='';
+ my $length;
my $indent;
my $previndent=0;
my $stashindent=0;
@@ -145,7 +246,7 @@ sub process {
#extract the line range in the file after the patch is applied
if ($line=~/^\@\@ -\d+,\d+ \+(\d+)(,(\d+))? \@\@/) {
$is_patch = 1;
- $first_line = 1;
+ $first_line = $linenr + 1;
$in_comment = 0;
$realline=$1-1;
if (defined $2) {
@@ -156,8 +257,10 @@ sub process {
next;
}
-#track the line number as we move through the hunk
- if ($line=~/^[ \+]/) {
+# track the line number as we move through the hunk, note that
+# new versions of GNU diff omit the leading space on completely
+# blank context lines so we need to count that too.
+ if ($line =~ /^( |\+|$)/) {
$realline++;
$realcnt-- if ($realcnt != 0);
@@ -168,7 +271,7 @@ sub process {
# 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 $line =~ m@^.\s*\*@) {
+ if ($linenr == $first_line and $line =~ m@^.\s*\*@) {
$in_comment = 1;
}
if ($line =~ m@/\*@) {
@@ -178,17 +281,12 @@ sub process {
$in_comment = 0;
}
- $lineforcounting = $line;
- $lineforcounting =~ s/^\+//;
- $lineforcounting = expand_tabs($lineforcounting);
-
- my ($white) = ($lineforcounting =~ /^(\s*)/);
- $indent = length($white);
+ # Measure the line length and indent.
+ ($length, $indent) = line_stats($line);
# 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
@@ -203,6 +301,8 @@ sub process {
$signoff++;
} elsif ($line =~ /^\s*signed-off-by:/i) {
+ # This is a signoff, if ugly, so do not double report.
+ $signoff++;
if (!($line =~ /^\s*Signed-off-by:/)) {
print "use Signed-off-by:\n";
print "$herecurr";
@@ -229,7 +329,7 @@ sub process {
$clean = 0;
}
#80 column limit
- if (!($prevline=~/\/\*\*/) && length($lineforcounting) > 80) {
+ if (!($prevline=~/\/\*\*/) && $length > 80) {
print "line over 80 characters\n";
print "$herecurr";
$clean = 0;
@@ -254,7 +354,7 @@ sub process {
next if ($in_comment);
# no C99 // comments
- if ($line =~ m@//@ and !($line =~ m@\".*//.*\"@)) {
+ if (has_non_quoted($line, '//')) {
print "do not use C99 // comments\n";
print "$herecurr";
$clean = 0;
@@ -320,44 +420,44 @@ sub process {
print "$herecurr";
$clean = 0;
}
+ # Note we expand the line with the leading + as the real
+ # line will be displayed with the leading + and the tabs
+ # will therefore also expand that way.
my $opline = $line;
+ $opline = expand_tabs($opline);
$opline =~ s/^.//;
if (!($line=~/\#\s*include/)) {
# Check operator spacing.
my @elements = split(/(<<=|>>=|<=|>=|==|!=|\+=|-=|\*=|\/=|%=|\^=|\|=|&=|->|<<|>>|<|>|=|!|~|&&|\|\||,|\^|\+\+|--|;|&|\||\+|-|\*|\/\/|\/)/, $opline);
+ my $off = 1;
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 '';
+ $off += length($elements[$n]);
+
+ my $a = '';
+ $a = 'V' if ($elements[$n] ne '');
+ $a = 'W' if ($elements[$n] =~ /\s$/);
+ $a = 'B' if ($elements[$n] =~ /(\[|\()$/);
+ $a = 'O' if ($elements[$n] eq '');
+ $a = 'E' if ($elements[$n] eq '' && $n == 0);
+
my $op = $elements[$n + 1];
- my $w2 = 1;
- my $s2 = 1;
- my $o2 = 0;
- # If we have something after the operator handle it.
+
+ my $c = '';
if (defined $elements[$n + 2]) {
- $w2 = $elements[$n + 2] =~ /^\s/;
- $s2 = $elements[$n + 2] =~ /^(\s|\)|\]|;)/;
- $o2 = $elements[$n + 2] eq '';
+ $c = 'V' if ($elements[$n + 2] ne '');
+ $c = 'W' if ($elements[$n + 2] =~ /^\s/);
+ $c = 'B' if ($elements[$n + 2] =~ /^(\)|\]|;)/);
+ $c = 'O' if ($elements[$n + 2] eq '');
+ } else {
+ $c = 'E';
}
- # 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;
- }
- }
+ my $ctx = "${a}x${c}";
+
+ my $at = "(ctx:$ctx)";
+
+ my $ptr = (" " x $off) . "^";
+ my $hereptr = "$here\n$line\n$ptr\n\n";
##print "<$s1:$op:$s2> <$elements[$n]:$elements[$n + 1]:$elements[$n + 2]>\n";
# Skip things apparently in quotes.
@@ -368,38 +468,38 @@ sub process {
# -> should have no spaces
} elsif ($op eq '->') {
- if ($s1 or $s2) {
+ if ($ctx =~ /Wx.|.xW/) {
print "no spaces around that '$op' $at\n";
- print "$herecurr";
+ print "$hereptr";
$clean = 0;
}
# , must have a space on the right.
} elsif ($op eq ',') {
- if (!$s2) {
+ if ($ctx !~ /.xW|.xE/) {
print "need space after that '$op' $at\n";
- print "$herecurr";
+ print "$hereptr";
$clean = 0;
}
# unary ! and unary ~ are allowed no space on the right
} elsif ($op eq '!' or $op eq '~') {
- if (!$s1 && !$o1) {
+ if ($ctx !~ /[WOEB]x./) {
print "need space before that '$op' $at\n";
- print "$herecurr";
+ print "$hereptr";
$clean = 0;
}
- if ($s2) {
+ if ($ctx =~ /.xW/) {
print "no space after that '$op' $at\n";
- print "$herecurr";
+ print "$hereptr";
$clean = 0;
}
# unary ++ and unary -- are allowed no space on one side.
} elsif ($op eq '++' or $op eq '--') {
- if (($s1 && $s2) || ((!$s1 && !$o1) && (!$s2 && !$o2))) {
+ if ($ctx !~ /[WOB]x[^W]|[^W]x[WOB]/) {
print "need space one side of that '$op' $at\n";
- print "$herecurr";
+ print "$hereptr";
$clean = 0;
}
@@ -420,10 +520,17 @@ sub process {
# (foo *)
# (foo **)
#
- } elsif ($op eq '&' or $op eq '-' or $op eq '*') {
- if ($w2 and !$w1) {
+ } elsif ($op eq '&' or $op eq '-') {
+ if ($ctx !~ /VxV|[EWB]x[WE]|[EWB]x[VO]/) {
+ print "need space before that '$op' $at\n";
+ print "$hereptr";
+ $clean = 0;
+ }
+
+ } elsif ($op eq '*') {
+ if ($ctx !~ /VxV|[EWB]x[WE]|[EWB]x[VO]|[EWO]x[OBV]/) {
print "need space before that '$op' $at\n";
- print "$herecurr";
+ print "$hereptr";
$clean = 0;
}
@@ -431,18 +538,19 @@ sub process {
} elsif ($op eq '<<' or $op eq '>>' or $op eq '+' or $op eq '/' or
$op eq '^' or $op eq '|')
{
- if ($s1 != $s2) {
+ if ($ctx !~ /VxV|WxW|VxE|WxE/) {
print "need consistent spacing around '$op' $at\n";
- print "$herecurr";
+ print "$hereptr";
$clean = 0;
}
# All the others need spaces both sides.
- } elsif (!$s1 or !$s2) {
+ } elsif ($ctx !~ /[EW]x[WE]/) {
print "need spaces around that '$op' $at\n";
- print "$herecurr";
+ print "$hereptr";
$clean = 0;
}
+ $off += length($elements[$n + 1]);
}
}
@@ -454,7 +562,7 @@ sub process {
}
#goto labels aren't indented, allow a single space however
- if ($line=~/^.\s+[A-Za-z\d_]+:/ and
+ if ($line=~/^.\s+[A-Za-z\d_]+:(?![0-9]+)/ and
!($line=~/^. [A-Za-z\d_]+:/) and !($line=~/^.\s+default:/)) {
print "labels should not be indented\n";
print "$herecurr";
@@ -462,15 +570,15 @@ sub process {
}
# Need a space before open parenthesis after if, while etc
- if ($line=~/(if|while|for|switch)\(/) {
+ if ($line=~/\b(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";
+ if ($line=~/\b(if|while)\s*\(.*[^<>!=]=[^=].*\)/) {
+ print "do not use assignment in condition\n";
print "$herecurr";
$clean = 0;
}
@@ -484,15 +592,28 @@ sub process {
$clean = 0;
}
- # Check for switch () {<nl>case, these must be at the
- # same indent. We will only catch the first one, as our
- # context is very small but people tend to be consistent
- # so we will catch them out more often than not.
- if ($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";
- $clean = 0;
+ # Check for switch () and associated case and default
+ # statements should be at the same indent.
+ if ($line=~/\bswitch\s*\(.*\)/) {
+ my $err = '';
+ my $sep = '';
+ my @ctx = ctx_block_outer($linenr, $realcnt);
+ shift(@ctx);
+ for my $ctx (@ctx) {
+ my ($clen, $cindent) = line_stats($ctx);
+ if ($ctx =~ /\s*(case\s+|default:)/ &&
+ $indent != $cindent) {
+ $err .= "$sep$ctx\n";
+ $sep = '';
+ } else {
+ $sep = "[...]\n";
+ }
+ }
+ if ($err ne '') {
+ print "switch and case should be at the same indent\n";
+ print "$here\n$line\n$err\n";
+ $clean = 0;
+ }
}
#studly caps, commented out until figure out how to distinguish between use of existing and adding new
@@ -520,7 +641,7 @@ sub process {
}
#if/while/etc brace do not go on next line, unless #defining a do while loop, or if that brace on the next line is for something else
- if ($prevline=~/(if|while|for|switch)\s*\(/) {
+ if ($prevline=~/\b(if|while|for|switch)\s*\(/) {
my @opened = $prevline=~/\(/g;
my @closed = $prevline=~/\)/g;
my $nr_line = $linenr;
@@ -529,7 +650,7 @@ sub process {
my $extra_lines = 0;
my $display_segment = $prevline;
- while ($remaining > 0 && scalar @opened > scalar @closed) {
+ while ($remaining > 1 && scalar @opened > scalar @closed) {
$prevline .= $next_line;
$display_segment .= "\n" . $next_line;
$next_line = $lines[$nr_line];
@@ -540,10 +661,10 @@ sub process {
@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/)) {
+ if (($prevline=~/\b(if|while|for|switch)\s*\(.*\)\s*$/) and ($next_line=~/{/) and
+ !($next_line=~/\b(if|while|for)/) and !($next_line=~/\#define.*do.*while/)) {
print "That { should be on the previous line\n";
- print "$display_segment\n$next_line\n\n";
+ print "$here\n$display_segment\n$next_line\n\n";
$clean = 0;
}
}
@@ -558,7 +679,7 @@ sub process {
}
# don't include deprecated include files
- for my $inc (@deprecated) {
+ for my $inc (@dep_includes) {
if ($line =~ m@\#\s*include\s*\<$inc>@) {
print "Don't use <$inc>: see Documentation/feature-removal-schedule.txt\n";
print "$herecurr";
@@ -566,9 +687,49 @@ sub process {
}
}
-# don't use kernel_thread()
- if ($line =~ /\bkernel_thread\b/) {
- print "Don't use kernel_thread(), use kthread(): see Documentation/feature-removal-schedule.txt\n";
+# don't use deprecated functions
+ for my $func (@dep_functions) {
+ if (has_non_quoted($line, '\b' . $func . '\b')) {
+ print "Don't use $func(): see Documentation/feature-removal-schedule.txt\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+ }
+
+# no volatiles please
+ if (has_non_quoted($line, '\bvolatile\b')) {
+ print "Use of volatile is usually wrong: see Documentation/volatile-considered-harmful.txt\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+
+# warn about #ifdefs in C files
+ if ($line =~ /^.#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
+ print "#ifdef in C files should be avoided\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+
+# check for spinlock_t definitions without a comment.
+ if ($line =~ /^.\s*(struct\s+mutex|spinlock_t)\s+\S+;/) {
+ my $which = $1;
+ if (!ctx_has_comment($first_line, $linenr)) {
+ print "$1 definition without comment\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+ }
+# check for memory barriers without a comment.
+ if ($line =~ /\b(mb|rmb|wmb|read_barrier_depends|smp_mb|smp_rmb|smp_wmb|smp_read_barrier_depends)\(/) {
+ if (!ctx_has_comment($first_line, $linenr)) {
+ print "memory barrier without comment\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+ }
+# check of hardware specific defines
+ if ($line =~ m@^.#\s*if.*\b(__i386__|__powerpc64__|__sun__|__s390x__)\b@) {
+ print "architecture specific defines should be avoided\n";
print "$herecurr";
$clean = 0;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.