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

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Date:   Thu, 01 Sep 2022 14:22:33 -0400
From:   Joe Perches <joe@...ches.com>
To:     Mickaël Salaün <mic@...ikod.net>,
        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 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.