From: Arnd Bergmann <arnd@arndb.de>
To: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Ben Dooks <ben.dooks@codethink.co.uk>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
DTML <devicetree@vger.kernel.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
Subject: Re: [Question] orphan platform data header
Date: Sun, 21 Jul 2019 16:15:05 +0200 [thread overview]
Message-ID: <CAK8P3a133ekPqkLWfC2ee0mT3iLbFzSjJ9FDokSyaX+hMVigKA@mail.gmail.com> (raw)
In-Reply-To: <CAK7LNARN=iNmresDJ2=J1wOb2QYoZ7yw4O0Q9sYVPo0jRKDf=w@mail.gmail.com>
On Sun, Jul 21, 2019 at 2:13 PM Masahiro Yamada
<yamada.masahiro@socionext.com> wrote:
> On Sun, Jul 21, 2019 at 6:10 PM Arnd Bergmann <arnd@arndb.de> wrote:
> > On Sun, Jul 21, 2019 at 5:45 AM Masahiro Yamada
> > <yamada.masahiro@socionext.com> wrote:
> > > On Sat, Jul 20, 2019 at 10:55 PM Arnd Bergmann <arnd@arndb.de> wrote:
> > > > On Sat, Jul 20, 2019 at 5:26 AM Masahiro Yamada <yamada.masahiro@socionext.com> wrote:
>
>
> Another example that I have no idea
> how it works:
>
> drivers/net/hamradio/yam.c
>
> yam_ioctl() reads data from user-space,
> but the data structures for ioctl are
> defined in include/linux/yam.h
That is different: the hardware attaches to a serial port and may well
be usable, and the user space side just contains a copy of the header,
see https://github.com/nwdigitalradio/ax25-tools/tree/master/yamdrv
> If we want to fix this, we could move it
> to include/uapi/linux/yam.h
We could do that, or just leave it alone, as nobody would
tell the difference.
> But, if nobody has reported any problem about this,
> it might be a good proof that nobody is using this driver.
>
> Maybe, can we simply drop odd drivers??
Both the kernel driver and the user space side have a maintainer, and
I see no indication that it is actually broken. The driver is clearly
a relic from old times (earlier than 2.4) and we would not merge
this driver today.
It seems more useful to keep looking for drivers with a platform_data
header file that is no longer included by any platform for candidates
that may be obsolete.
Arnd
WARNING: multiple messages have this Message-ID (diff)
From: Arnd Bergmann <arnd@arndb.de>
To: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: DTML <devicetree@vger.kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Ben Dooks <ben.dooks@codethink.co.uk>,
Linus Torvalds <torvalds@linux-foundation.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
Subject: Re: [Question] orphan platform data header
Date: Sun, 21 Jul 2019 16:15:05 +0200 [thread overview]
Message-ID: <CAK8P3a133ekPqkLWfC2ee0mT3iLbFzSjJ9FDokSyaX+hMVigKA@mail.gmail.com> (raw)
In-Reply-To: <CAK7LNARN=iNmresDJ2=J1wOb2QYoZ7yw4O0Q9sYVPo0jRKDf=w@mail.gmail.com>
On Sun, Jul 21, 2019 at 2:13 PM Masahiro Yamada
<yamada.masahiro@socionext.com> wrote:
> On Sun, Jul 21, 2019 at 6:10 PM Arnd Bergmann <arnd@arndb.de> wrote:
> > On Sun, Jul 21, 2019 at 5:45 AM Masahiro Yamada
> > <yamada.masahiro@socionext.com> wrote:
> > > On Sat, Jul 20, 2019 at 10:55 PM Arnd Bergmann <arnd@arndb.de> wrote:
> > > > On Sat, Jul 20, 2019 at 5:26 AM Masahiro Yamada <yamada.masahiro@socionext.com> wrote:
>
>
> Another example that I have no idea
> how it works:
>
> drivers/net/hamradio/yam.c
>
> yam_ioctl() reads data from user-space,
> but the data structures for ioctl are
> defined in include/linux/yam.h
That is different: the hardware attaches to a serial port and may well
be usable, and the user space side just contains a copy of the header,
see https://github.com/nwdigitalradio/ax25-tools/tree/master/yamdrv
> If we want to fix this, we could move it
> to include/uapi/linux/yam.h
We could do that, or just leave it alone, as nobody would
tell the difference.
> But, if nobody has reported any problem about this,
> it might be a good proof that nobody is using this driver.
>
> Maybe, can we simply drop odd drivers??
Both the kernel driver and the user space side have a maintainer, and
I see no indication that it is actually broken. The driver is clearly
a relic from old times (earlier than 2.4) and we would not merge
this driver today.
It seems more useful to keep looking for drivers with a platform_data
header file that is no longer included by any platform for candidates
that may be obsolete.
Arnd
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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-07-21 14:15 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-20 3:25 [Question] orphan platform data header Masahiro Yamada
2019-07-20 3:25 ` Masahiro Yamada
2019-07-20 3:25 ` Masahiro Yamada
2019-07-20 13:54 ` Arnd Bergmann
2019-07-20 13:54 ` Arnd Bergmann
2019-07-21 3:44 ` Masahiro Yamada
2019-07-21 3:44 ` Masahiro Yamada
2019-07-21 3:44 ` Masahiro Yamada
2019-07-21 9:09 ` Arnd Bergmann
2019-07-21 9:09 ` Arnd Bergmann
2019-07-21 12:12 ` Masahiro Yamada
2019-07-21 12:12 ` Masahiro Yamada
2019-07-21 14:15 ` Arnd Bergmann [this message]
2019-07-21 14:15 ` Arnd Bergmann
2019-07-21 14:58 ` Masahiro Yamada
2019-07-21 14:58 ` Masahiro Yamada
2019-07-22 6:46 ` Enrico Weigelt, metux IT consult
2019-07-22 6:46 ` Enrico Weigelt, metux IT consult
2019-07-22 6:46 ` Enrico Weigelt, metux IT consult
2019-07-22 7:24 ` Arnd Bergmann
2019-07-22 7:24 ` Arnd Bergmann
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