linux-kernel - Re: [PATCH] checkpatch: add --typedefsfile

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Date:   Fri, 21 Apr 2017 08:31:05 +0200
From:   Jerome Forissier <jerome.forissier@...aro.org>
To:     Joe Perches <joe@...ches.com>, Andy Whitcroft <apw@...onical.com>,
        linux-kernel@...r.kernel.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] checkpatch: add --typedefsfile



On 04/20/2017 06:49 PM, Joe Perches wrote:
> On Thu, 2017-04-20 at 17:39 +0200, Jerome Forissier wrote:
>> When using checkpatch on out-of-tree code, it may occur that some
>> project-specific types are used, which will cause spurious warnings.
>> Add the --typedefsfile option as a way to extend the known types and
>> deal with this issue.
> 
> I'm not opposed to the addition.
> What out-of-tree project is this for?

OP-TEE [1]. We run a Travis job on all pull requests [2], and checkpatch
is part of that. The typical false warning we get on a regular basis is
with some pointers to functions returning TEE_Result [3], which is a
typedef from the GlobalPlatform APIs. We consider it is acceptable to
use GP types in the OP-TEE core implementation, that's why this patch
would be helpful for us.

[1] https://github.com/OP-TEE/optee_os
[2] https://travis-ci.org/OP-TEE/optee_os/builds
[3] https://travis-ci.org/OP-TEE/optee_os/builds/193355335#L1733

Thanks,
-- 
Jerome

> 
>> Signed-off-by: Jerome Forissier <jerome.forissier@...aro.org>
>> ---
>>  scripts/checkpatch.pl | 56 ++++++++++++++++++++++++++++++++++-----------------
>>  1 file changed, 37 insertions(+), 19 deletions(-)
>>
>> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
>> index baa3c7b..eb55f5f 100755
>> --- a/scripts/checkpatch.pl
>> +++ b/scripts/checkpatch.pl
>> @@ -55,6 +55,7 @@ my $spelling_file = "$D/spelling.txt";
>>  my $codespell = 0;
>>  my $codespellfile = "/usr/share/codespell/dictionary.txt";
>>  my $conststructsfile = "$D/const_structs.checkpatch";
>> +my $typedefsfile = "";
>>  my $color = 1;
>>  my $allow_c99_comments = 1;
>>  
>> @@ -113,6 +114,7 @@ Options:
>>    --codespell                Use the codespell dictionary for spelling/typos
>>                               (default:/usr/share/codespell/dictionary.txt)
>>    --codespellfile            Use this codespell dictionary
>> +  --typedefsfile             Read additional types from this file
>>    --color                    Use colors when output is STDOUT (default: on)
>>    -h, --help, --version      display this help and exit
>>  
>> @@ -208,6 +210,7 @@ GetOptions(
>>  	'test-only=s'	=> \$tst_only,
>>  	'codespell!'	=> \$codespell,
>>  	'codespellfile=s'	=> \$codespellfile,
>> +	'typedefsfile=s'	=> \$typedefsfile,
>>  	'color!'	=> \$color,
>>  	'h|help'	=> \$help,
>>  	'version'	=> \$help
>> @@ -629,28 +632,43 @@ if ($codespell) {
>>  
>>  $misspellings = join("|", sort keys %spelling_fix) if keys %spelling_fix;
>>  
>> +sub read_words {
>> +	my ($wordsRef, $file) = @_;
>> +
>> +	if (open(my $words, '<', $file)) {
>> +		while (<$words>) {
>> +			my $line = $_;
>> +
>> +			$line =~ s/\s*\n?$//g;
>> +			$line =~ s/^\s*//g;
>> +
>> +			next if ($line =~ m/^\s*#/);
>> +			next if ($line =~ m/^\s*$/);
>> +			if ($line =~ /\s/) {
>> +				print("$file: '$line' invalid - ignored\n");
>> +				next;
>> +			}
>> +
>> +			$$wordsRef .= '|' if ($$wordsRef ne "");
>> +			$$wordsRef .= $line;
>> +		}
>> +		close($file);
>> +		return 1;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>>  my $const_structs = "";
>> -if (open(my $conststructs, '<', $conststructsfile)) {
>> -	while (<$conststructs>) {
>> -		my $line = $_;
>> +read_words(\$const_structs, $conststructsfile)
>> +    or warn "No structs that should be const will be found - file '$conststructsfile': $!\n";
>>  
>> -		$line =~ s/\s*\n?$//g;
>> -		$line =~ s/^\s*//g;
>> -
>> -		next if ($line =~ m/^\s*#/);
>> -		next if ($line =~ m/^\s*$/);
>> -		if ($line =~ /\s/) {
>> -			print("$conststructsfile: '$line' invalid - ignored\n");
>> -			next;
>> -		}
>> -
>> -		$const_structs .= '|' if ($const_structs ne "");
>> -		$const_structs .= $line;
>> -	}
>> -	close($conststructsfile);
>> -} else {
>> -	warn "No structs that should be const will be found - file '$conststructsfile': $!\n";
>> +my $typeOtherTypedefs = "";
>> +if (length($typedefsfile)) {
>> +	read_words(\$typeOtherTypedefs, $typedefsfile)
>> +	    or warn "No additional types will be considered - file '$typedefsfile': $!\n";
>>  }
>> +$typeTypedefs .= '|' . $typeOtherTypedefs if ($typeOtherTypedefs ne "");
>>  
>>  sub build_types {
>>  	my $mods = "(?x:  \n" . join("|\n  ", (@modifierList, @modifierListFile)) . "\n)";