linux-kernel - Re: [PATCH 6/7] fs/sysfs/group: make attribute

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Message-ID: <CAKPOu+8k2x1CucWSzoouts0AfMJk+srJXWWf3iWVOeY+fWkOpQ@mail.gmail.com>
Date:   Mon, 9 Oct 2023 22:05:55 +0200
From:   Max Kellermann <max.kellermann@...os.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Jens Axboe <axboe@...nel.dk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
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Subject: Re: [PATCH 6/7] fs/sysfs/group: make attribute_group pointers const

On Mon, Oct 9, 2023 at 7:24 PM Guenter Roeck <linux@...ck-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.