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Subject: Re: [PATCH] media: do not use C++ style comments in uapi headers
From:   Joe Perches <joe@perches.com>
To:     Masahiro Yamada <yamada.masahiro@socionext.com>,
        Julia Lawall <julia.lawall@lip6.fr>
Cc:     Mauro Carvalho Chehab <mchehab@kernel.org>,
        Greg KH <gregkh@linuxfoundation.org>,
        Arnd Bergmann <arnd@arndb.de>,
        Linux Media Mailing List <linux-media@vger.kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Randy Dunlap <rdunlap@infradead.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Date:   Sun, 09 Jun 2019 04:55:09 -0700
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On Sun, 2019-06-09 at 16:14 +0900, Masahiro Yamada wrote:
> Hi Joe,
> 
> On Thu, Jun 6, 2019 at 2:06 AM Joe Perches <joe@perches.com> wrote:
> > Perhaps a checkpatch change too:
> > 
> > The first block updates unsigned only bitfields
> > The second tests uapi definitions and suggests "__<kernel_types"
> 
> Good.
> 
> In addition,
> 
> "warn if __u8, __u16, __u32, __u64 are used outside of uapi/"
> 
> Lots of kernel-space headers use __u{8,16,32,64} instead of u{8,16,32,64}
> just because developers often miss to understand when to use
> the underscore-prefixed types.

The problem there is that checkpatch can't know if the
__<uapi_type> being used is for an actual uapi use or not.

coccinelle could be much better at that.