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Date:   Tue, 10 Oct 2023 08:57:55 +0200
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     Joe Perches <joe@perches.com>
Cc:     Max Kellermann <max.kellermann@ionos.com>,
        Guenter Roeck <linux@roeck-us.net>,
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Subject: Re: [PATCH 6/7] fs/sysfs/group: make attribute_group pointers const
Message-ID: <2023101041-giggle-refried-5b8c@gregkh>
References: <20231009165741.746184-1-max.kellermann@ionos.com>
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 <CAKPOu+8k2x1CucWSzoouts0AfMJk+srJXWWf3iWVOeY+fWkOpQ@mail.gmail.com>
 <f511170fe61d7e7214a3a062661cf4103980dad6.camel@perches.com>
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On Mon, Oct 09, 2023 at 11:48:10PM -0700, Joe Perches wrote:
> On Mon, 2023-10-09 at 22:05 +0200, Max Kellermann wrote:
> > On Mon, Oct 9, 2023 at 7:24 PM Guenter Roeck <linux@roeck-us.net> wrote:
> > > Also, I don't know why checkpatch is happy with all the
> > > 
> > >         const struct attribute_group *const*groups;
> > > 
> > > instead of
> > > 
> > >         const struct attribute_group *const *groups;
> > 
> > I found out that checkpatch has no check for this at all; it does
> > complain about such lines, but only for local variables. But that
> > warning is actually a bug, because this is a check for unary
> > operators: it thinks the asterisk is a dereference operator, not a
> > pointer declaration, and complains that the unary operator must be
> > preceded by a space. Thus warnings on local variable are only correct
> > by coincidence, not by design.
> > 
> > Inside structs or parameters (where my coding style violations can be
> > found), it's a different context and thus checkpatch doesn't apply the
> > rules for unary operators.
> 
> My opinion is that const use in the kernel should almost
> always have whitespace before and after it except when
> preceded by a open parenthesis or a newline.

I totally agree.