Commit 9c0ca6f9 authored by Andy Whitcroft's avatar Andy Whitcroft Committed by Linus Torvalds
Browse files

update checkpatch.pl to version 0.10



This version brings a number of new checks, and a number of bug
fixes.  Of note:

  - better categorisation and space checks for dual use unary/binary
    operators
  - warn on deprecated use of {SPIN,RW}_LOCK_UNLOCKED
  - check if/for/while with trailing ';' for hanging statements
  - detect DOS line endings
  - detect redundant casts for kalloc()

Andy Whitcroft (18):
      Version: 0.10
      asmlinkage is also a storage type
      pull out inline specifiers
      allow only some operators before a unary operator
      parenthesised values may span line ends
      add additional attribute matching
      handle sparse annotations within pointer type space checks
      support alternative function definition syntax for typedefs
      check if/for/while with trailing ';' for hanging statements
      fix output format for case checks
      deprecate SPIN_LOCK_UNLOCKED and RW_LOCK_UNLOCKED
      allow complex macros with bracketing braces
      detect and report DOS line endings
      fastcall is a valid function attribute
      bracket spacing is ok for 'for'
      categorise operators into unary/binary/definitions
      add heuristic to pick up on unannotated types
      remove spurious warnings from cat_vet

Dave Jones (1):
      Make checkpatch warn about pointless casting of kalloc returns.
Signed-off-by: default avatarAndy Whitcroft <apw@shadowen.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 2e8ecb9d
......@@ -9,7 +9,7 @@ use strict;
my $P = $0;
$P =~ s@.*/@@g;
my $V = '0.09';
my $V = '0.10';
use Getopt::Long qw(:config no_auto_abbrev);
......@@ -212,6 +212,11 @@ sub ctx_block_level {
return ctx_block_get($linenr, $remain, 0, '{', '}', 0);
}
sub ctx_statement_level {
my ($linenr, $remain, $off) = @_;
return ctx_block_get($linenr, $remain, 0, '(', ')', $off);
}
sub ctx_locate_comment {
my ($first_line, $end_line) = @_;
......@@ -255,13 +260,42 @@ sub ctx_has_comment {
return ($cmt ne '');
}
sub ctx_expr_before {
my ($line) = @_;
##print "CHECK<$line>\n";
my $pos = length($line) - 1;
my $count = 0;
my $c;
for (; $pos >= 0; $pos--) {
$c = substr($line, $pos, 1);
##print "CHECK: c<$c> count<$count>\n";
if ($c eq ')') {
$count++;
} elsif ($c eq '(') {
last if (--$count == 0);
}
}
##print "CHECK: result<" . substr($line, 0, $pos) . ">\n";
return substr($line, 0, $pos);
}
sub cat_vet {
my ($vet) = @_;
my ($res, $coded);
$vet =~ s/\t/^I/;
$vet =~ s/$/\$/;
$res = '';
while ($vet =~ /([^[:cntrl:]]*)([[:cntrl:]])/g) {
$coded = sprintf("^%c", unpack('C', $2) + 64);
$res .= $1 . $coded;
}
$res =~ s/$/\$/;
return $vet;
return $res;
}
my @report = ();
......@@ -310,8 +344,17 @@ sub process {
my $first_line = 0;
my $Ident = qr{[A-Za-z\d_]+};
my $Storage = qr{extern|static};
my $Sparse = qr{__user|__kernel|__force|__iomem|__must_check|__init_refok};
my $Storage = qr{extern|static|asmlinkage};
my $Sparse = qr{
__user|
__kernel|
__force|
__iomem|
__must_check|
__init_refok|
fastcall
}x;
my $Inline = qr{inline|__always_inline|noinline};
my $NonptrType = qr{
\b
(?:const\s+)?
......@@ -345,11 +388,18 @@ sub process {
(?:\s+$Sparse)*
}x;
my $Declare = qr{(?:$Storage\s+)?$Type};
my $Attribute = qr{const|__read_mostly|__init|__initdata|__meminit};
my $Attribute = qr{
const|
__read_mostly|
__(?:mem|cpu|dev|)(?:initdata|init)
}x;
my $Member = qr{->$Ident|\.$Ident|\[[^]]*\]};
my $Lval = qr{$Ident(?:$Member)*};
# Possible bare types.
my @bare = ();
my $Bare = $NonptrType;
# Pre-scan the patch looking for any __setup documentation.
my @setup_docs = ();
my $setup_docs = 0;
......@@ -477,7 +527,11 @@ sub process {
next if ($realfile !~ /\.(h|c|s|S|pl|sh)$/);
#trailing whitespace
if ($line =~ /^\+.*\S\s+$/ || $line =~ /^\+\s+$/) {
if ($line =~ /^\+.*\015/) {
my $herevet = "$here\n" . cat_vet($line) . "\n";
ERROR("DOS line endings\n" . $herevet);
} elsif ($line =~ /^\+.*\S\s+$/ || $line =~ /^\+\s+$/) {
my $herevet = "$here\n" . cat_vet($line) . "\n";
ERROR("trailing whitespace\n" . $herevet);
}
......@@ -509,6 +563,30 @@ sub process {
# Standardise the strings and chars within the input to simplify matching.
$line = sanitise_line($line);
# Check for potential 'bare' types
if ($realcnt &&
$line !~ /^.\s*(?:$Storage\s+)?(?:$Inline\s+)?$Type\b/ &&
$line !~ /$Ident:\s*$/ &&
$line !~ /^.\s*$Ident\s*\(/ &&
($line =~ /^.(?:$Storage\s+)?(?:$Inline\s+)?($Ident)\b/ ||
$line =~ /^.\s*(?:$Storage\s+)?($Ident)\b\s*\**\s*$Ident\s*(?:;|=)/)) {
my $possible = $1;
if ($possible !~ /^(?:$Storage|$Type|DEFINE_\S+)$/ &&
$possible ne 'goto' && $possible ne 'return' &&
$possible ne 'struct' && $possible ne 'enum' &&
$possible ne 'case' && $possible ne 'else' &&
$possible ne 'typedef') {
#print "POSSIBLE<$possible>\n";
push(@bare, $possible);
my $bare = join("|", @bare);
$Bare = qr{
\b(?:$bare)\b
(?:\s*\*+\s*const|\s*\*+|(?:\s*\[\s*\])+)?
(?:\s+$Sparse)*
}x;
}
}
#
# Checks which may be anchored in the context.
#
......@@ -531,18 +609,19 @@ sub process {
}
}
if ($err ne '') {
ERROR("switch and case should be at the same indent\n$hereline\n$err\n");
ERROR("switch and case should be at the same indent\n$hereline$err");
}
}
# 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 ($line =~ /\b(?:(if|while|for|switch)\s*\(|do\b|else\b)/ && $line !~ /^.#/) {
my @ctx = ctx_statement($linenr, $realcnt, 0);
my ($level, @ctx) = ctx_statement_level($linenr, $realcnt, 0);
my $ctx_ln = $linenr + $#ctx + 1;
my $ctx_cnt = $realcnt - $#ctx - 1;
my $ctx = join("\n", @ctx);
# Skip over any removed lines in the context following statement.
while ($ctx_cnt > 0 && $lines[$ctx_ln - 1] =~ /^-/) {
$ctx_ln++;
$ctx_cnt--;
......@@ -553,6 +632,13 @@ sub process {
ERROR("That open brace { should be on the previous line\n" .
"$here\n$ctx\n$lines[$ctx_ln - 1]");
}
if ($level == 0 && $ctx =~ /\)\s*\;\s*$/ && defined $lines[$ctx_ln - 1]) {
my ($nlength, $nindent) = line_stats($lines[$ctx_ln - 1]);
if ($nindent > $indent) {
WARN("Trailing semicolon indicates no statements, indent implies otherwise\n" .
"$here\n$ctx\n$lines[$ctx_ln - 1]");
}
}
}
#ignore lines not being added
......@@ -619,7 +705,7 @@ sub process {
# check for new typedefs, only function parameters and sparse annotations
# make sense.
if ($line =~ /\btypedef\s/ &&
$line !~ /\btypedef\s+$Type\s+\(\s*\*$Ident\s*\)\s*\(/ &&
$line !~ /\btypedef\s+$Type\s+\(\s*\*?$Ident\s*\)\s*\(/ &&
$line !~ /\b__bitwise(?:__|)\b/) {
WARN("do not add new typedefs\n" . $herecurr);
}
......@@ -633,11 +719,11 @@ sub process {
ERROR("\"(foo $1 )\" should be \"(foo $1)\"\n" .
$herecurr);
} elsif ($line =~ m{$NonptrType(\*+)(?:\s+$Attribute)?\s+[A-Za-z\d_]+}) {
} elsif ($line =~ m{$NonptrType(\*+)(?:\s+(?:$Attribute|$Sparse))?\s+[A-Za-z\d_]+}) {
ERROR("\"foo$1 bar\" should be \"foo $1bar\"\n" .
$herecurr);
} elsif ($line =~ m{$NonptrType\s+(\*+)(?!\s+$Attribute)\s+[A-Za-z\d_]+}) {
} elsif ($line =~ m{$NonptrType\s+(\*+)(?!\s+(?:$Attribute|$Sparse))\s+[A-Za-z\d_]+}) {
ERROR("\"foo $1 bar\" should be \"foo $1bar\"\n" .
$herecurr);
}
......@@ -693,7 +779,13 @@ sub process {
$opline = expand_tabs($opline);
$opline =~ s/^./ /;
if (!($line=~/\#\s*include/)) {
my @elements = split(/(<<=|>>=|<=|>=|==|!=|\+=|-=|\*=|\/=|%=|\^=|\|=|&=|=>|->|<<|>>|<|>|=|!|~|&&|\|\||,|\^|\+\+|--|;|&|\||\+|-|\*|\/\/|\/)/, $opline);
my $ops = qr{
<<=|>>=|<=|>=|==|!=|
\+=|-=|\*=|\/=|%=|\^=|\|=|&=|
=>|->|<<|>>|<|>|=|!|~|
&&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/
}x;
my @elements = split(/($ops|;)/, $opline);
my $off = 0;
for (my $n = 0; $n < $#elements; $n += 2) {
$off += length($elements[$n]);
......@@ -733,7 +825,60 @@ sub process {
my $ptr = (" " x $off) . "^";
my $hereptr = "$hereline$ptr\n";
##print "<$s1:$op:$s2> <$elements[$n]:$elements[$n + 1]:$elements[$n + 2]>\n";
# Classify operators into binary, unary, or
# definitions (* only) where they have more
# than one mode.
my $unary_ctx = $prevline . $ca;
$unary_ctx =~ s/^./ /;
my $is_unary = 0;
my $Unary = qr{
(?:
^|;|,|$ops|\(|\?|:|
\(\s*$Type\s*\)|
$Type|
return|case|else|
\{|\}|
\[|
^.\#\s*define\s+$Ident\s*(?:\([^\)]*\))?|
^.\#\s*else|
^.\#\s*endif|
^.\#\s*(?:if|ifndef|ifdef)\b.*
)\s*(?:|\\)\s*$
}x;
my $UnaryFalse = qr{
sizeof\s*\(\s*$Type\s*\)\s*$
}x;
my $UnaryDefine = qr{
(?:$Type|$Bare)\s*|
(?:$Type|$Bare).*,\s*\**
}x;
if ($op eq '-' || $op eq '&' || $op eq '*') {
# An operator is binary if the left hand
# side is a value. Pick out the known
# non-values.
if ($unary_ctx =~ /$Unary$/s &&
$unary_ctx !~ /$UnaryFalse$/s) {
$is_unary = 1;
# Special handling for ')' check if this
# brace represents a conditional, if so
# we are unary.
} elsif ($unary_ctx =~ /\)\s*$/) {
my $before = ctx_expr_before($unary_ctx);
if ($before =~ /(?:for|if|while)\s*$/) {
$is_unary = 1;
}
}
# Check for type definition for of '*'.
if ($op eq '*' && $unary_ctx =~ /$UnaryDefine$/) {
$is_unary = 2;
}
}
#if ($op eq '-' || $op eq '&' || $op eq '*') {
# print "UNARY: <$is_unary $a:$op:$c> <$ca:$op:$cc> <$unary_ctx>\n";
#}
# ; should have either the end of line or a space or \ after it
if ($op eq ';') {
......@@ -757,9 +902,16 @@ sub process {
ERROR("need space after that '$op' $at\n" . $hereptr);
}
# unary ! and unary ~ are allowed no space on the right
} elsif ($op eq '!' or $op eq '~') {
if ($ctx !~ /[WOEB]x./) {
# '*' as part of a type definition -- reported already.
} elsif ($op eq '*' && $is_unary == 2) {
#warn "'*' is part of type\n";
# unary operators should have a space before and
# none after. May be left adjacent to another
# unary operator, or a cast
} elsif ($op eq '!' || $op eq '~' ||
($is_unary && ($op eq '*' || $op eq '-' || $op eq '&'))) {
if ($ctx !~ /[WEB]x./ && $ca !~ /(?:\)|!|~|\*|-|\&|\||\+\+|\-\-|\{)$/) {
ERROR("need space before that '$op' $at\n" . $hereptr);
}
if ($ctx =~ /.xW/) {
......@@ -775,39 +927,13 @@ sub process {
ERROR("no space before that '$op' $at\n" . $hereptr);
}
# & is both unary and binary
# unary:
# a &b
# binary (consistent spacing):
# a&b OK
# a & b OK
#
# boiling down to: if there is a space on the right then there
# should be one on the left.
#
# - is the same
#
} elsif ($op eq '&' or $op eq '-') {
if ($ctx !~ /VxV|[EW]x[WE]|[EWB]x[VO]/) {
ERROR("need space before that '$op' $at\n" . $hereptr);
}
# * is the same as & only adding:
# type:
# (foo *)
# (foo **)
#
} elsif ($op eq '*') {
if ($ca !~ /$Type$/ && $cb !~ /(\*$;|$;\*)/ &&
$ctx !~ /VxV|[EW]x[WE]|[EWB]x[VO]|OxV|WxB|BxB/) {
ERROR("need space before that '$op' $at\n" . $hereptr);
}
# << and >> may either have or not have spaces both sides
} elsif ($op eq '<<' or $op eq '>>' or $op eq '+' or $op eq '/' or
$op eq '^' or $op eq '|')
} elsif ($op eq '<<' or $op eq '>>' or
$op eq '&' or $op eq '^' or $op eq '|' or
$op eq '+' or $op eq '-' or
$op eq '*' or $op eq '/')
{
if ($ctx !~ /VxV|WxW|VxE|WxE/) {
if ($ctx !~ /VxV|WxW|VxE|WxE|VxO/) {
ERROR("need consistent spacing around '$op' $at\n" .
$hereptr);
}
......@@ -865,10 +991,12 @@ sub process {
}
# check spacing on paretheses
if ($line =~ /\(\s/ && $line !~ /\(\s*$/) {
if ($line =~ /\(\s/ && $line !~ /\(\s*(?:\\)?$/ &&
$line !~ /for\s*\(\s+;/) {
ERROR("no space after that open parenthesis '('\n" . $herecurr);
}
if ($line =~ /\s\)/) {
if ($line =~ /\s\)/ && $line !~ /^.\s*\)/ &&
$line !~ /for\s*\(.*;\s+\)/) {
ERROR("no space before that close parenthesis ')'\n" . $herecurr);
}
......@@ -926,10 +1054,10 @@ sub process {
# multi-statement macros should be enclosed in a do while loop, grab the
# first statement and ensure its the whole macro if its not enclosed
# in a known goot container
if (($prevline=~/\#define.*\\/) and
!($prevline=~/do\s+{/) and !($prevline=~/\(\{/) and
!($line=~/do.*{/) and !($line=~/\(\{/) and
!($line=~/^.\s*$Declare\s/)) {
if ($prevline =~ /\#define.*\\/ &&
$prevline !~/(?:do\s+{|\(\{|\{)/ &&
$line !~ /(?:do\s+{|\(\{|\{)/ &&
$line !~ /^.\s*$Declare\s/) {
# Grab the first statement, if that is the entire macro
# its ok. This may start either on the #define line
# or the one below.
......@@ -1027,6 +1155,11 @@ sub process {
WARN("Use of volatile is usually wrong: see Documentation/volatile-considered-harmful.txt\n" . $herecurr);
}
# SPIN_LOCK_UNLOCKED & RW_LOCK_UNLOCKED are deprecated
if ($line =~ /\b(SPIN_LOCK_UNLOCKED|RW_LOCK_UNLOCKED)/) {
ERROR("Use of $1 is deprecated: see Documentation/spinlocks.txt\n" . $herecurr);
}
# warn about #if 0
if ($line =~ /^.#\s*if\s+0\b/) {
CHK("if this code is redundant consider removing it\n" .
......@@ -1073,8 +1206,8 @@ sub process {
# check the location of the inline attribute, that it is between
# storage class and type.
if ($line =~ /$Type\s+(?:inline|__always_inline|noinline)\b/ ||
$line =~ /\b(?:inline|__always_inline|noinline)\s+$Storage/) {
if ($line =~ /\b$Type\s+$Inline\b/ ||
$line =~ /\b$Inline\s+$Storage\b/) {
ERROR("inline keyword should sit between storage class and type\n" . $herecurr);
}
......@@ -1091,6 +1224,11 @@ sub process {
CHK("__setup appears un-documented -- check Documentation/kernel-parameters.txt\n" . $herecurr);
}
}
# check for pointless casting of kmalloc return
if ($line =~ /\*\s*\)\s*k[czm]alloc\b/) {
WARN("unnecessary cast may hide bugs, see http://c-faq.com/malloc/mallocnocast.html\n" . $herecurr);
}
}
if ($chk_patch && !$is_patch) {
......
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