linux-kernel - Re: [PATCH] checkpatch: ignore CamelCase for inttypes.h format specifiers

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Date:   Wed, 10 Jun 2020 15:22:55 -0700
From:   Joe Perches <joe@...ches.com>
To:     Scott Branden <scott.branden@...adcom.com>,
        Andy Whitcroft <apw@...onical.com>
Cc:     BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] checkpatch: ignore CamelCase for inttypes.h format
 specifiers

On Wed, 2020-06-10 at 14:48 -0700, Scott Branden wrote:
> 
> On 2020-06-10 2:09 p.m., Joe Perches wrote:
> > On Wed, 2020-06-10 at 13:33 -0700, Scott Branden wrote:
> > > Ignore CamelCase for inttypes.h for fixed integer types format specifiers.
> > > (ex. PRIx32 for uint32_t).
> > Personally, I don't like those.
> Checkpatch is run against a lot of code outside of the linux kernel but 
> following linux coding style.

I know.  I don't have any strong feeling about this either.

But _this_ checkpatch is specifically for the linux-kernel.

I just don't want to encourage a bunch of uses of these
somewhat useless defines internal to linux-kernel sources.

> There is nothing personal about this, they are the format specifiers in 
> inttypes.h for fixed width types .

True.  It's impersonal to me too.

> > > diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
[]
> > > @@ -5157,6 +5157,8 @@ sub process {
> > >   			    $var =~ /[A-Z][a-z]|[a-z][A-Z]/ &&
> > >   #Ignore Page<foo> variants
> > >   			    $var !~ /^(?:Clear|Set|TestClear|TestSet|)Page[A-Z]/ &&
> > > +#Ignore inttypes.h scanf/printf format specifiers for fixed size integer types
> > > +			    $var !~ /^(?:PRI|SCN)[dxoui](8|16|32|64|PTR|MAX)?$/ &&

There are missing format specifiers.
If this is done, the test should be against a variable

Something like:

our $inttype_format = qr{(?x:
		(?:PRI|SCN)
		[diouxX]
		(?:FAST|LEAST)?
		(?:8|16|32|64|MAX|PTR)
};

btw: what about 24, 48, 96, 128 and 256?

> > >   #Ignore SI style variants like nS, mV and dB
> > >   #(ie: max_uV, regulator_min_uA_show, RANGE_mA_VALUE)
> > >   			    $var !~ /^(?:[a-z0-9_]*|[A-Z0-9_]*)?_?[a-z][A-Z](?:_[a-z0-9_]+|_[A-Z0-9_]+)?$/ &&