linux-kernel - Re: [RFC PATCH v1] checkpatch: Handle FILE pointer type

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Date:   Fri, 2 Sep 2022 11:04:46 +0200
From:   Mickaël Salaün <mic@...ikod.net>
To:     Joe Perches <joe@...ches.com>, Andy Whitcroft <apw@...onical.com>
Cc:     Dwaipayan Ray <dwaipayanray1@...il.com>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>,
        Shuah Khan <shuah@...nel.org>, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org,
        Jerome Forissier <jerome.forissier@...aro.org>
Subject: Re: [RFC PATCH v1] checkpatch: Handle FILE pointer type



On 01/09/2022 20:22, Joe Perches wrote:
> On Thu, 2022-09-01 at 11:49 -0400, Joe Perches wrote:
>> On Thu, 2022-09-01 at 16:59 +0200, Mickaël Salaün wrote:
>>> When using a "FILE *" type, checkpatch considers this an error.  Fix
>>> this by explicitly defining "FILE" as a common type.
>> []
>>> Another error may be throw when we use FIXTURE_{DATA,VARIANT}() structs,
>>> as defined in kselftest_harness.h .
>> []
>>> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
>> []
>>> @@ -576,10 +576,17 @@ our $typeKernelTypedefs = qr{(?x:
>>>   	(?:__)?(?:u|s|be|le)(?:8|16|32|64)|
>>>   	atomic_t
>>>   )};
>>> +our $typeStdioTypedefs = qr{(?x:
>>> +	FILE
>>> +)};
>>
>> I'm fine with this.
>>
>>> +# our $typeKselftestHarnessTypedefs = qr{(?x:
>>> +# 	FIXTURE_(?:DATA|VARIANT)\($Ident\)
>>> +# )};
>>
>> But not this.  Random userspace typedefs should likely
>> be kept in some local version of checkpatch.
>>
>> Or maybe add a command line option like --additional_typedefs=<file>.
> 
> Oops.  I forgot it already exists:
> 
>    --typedefsfile             Read additional types from this file
> 
> commit 75ad8c575a5ad105e2afc2051c68abceb9c65431
> Author: Jerome Forissier <jerome.forissier@...aro.org>
> Date:   Mon May 8 15:56:00 2017 -0700
> 
>      checkpatch: add --typedefsfile
>      
>      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.
> 

This doesn't work for the FIXTURE_DATA() case. And I'm not sure how 
contributors would know that they need to use this option with a 
specific file.