linux-kernel - Re: [RFC v1 02/14] bus1: provide stub cdev /dev/bus1

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Message-ID: <CAG-2HqV2F0_58Wa9VFvonV9V0MDTFiDrxndKkwdFfg2dZy_+0Q@mail.gmail.com>
Date:   Thu, 27 Oct 2016 18:39:51 +0200
From:   Tom Gundersen <teg@...m.no>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Andy Lutomirski <luto@...capital.net>,
        David Herrmann <dh.herrmann@...il.com>,
        Hannes Reinecke <hare@...e.com>,
        Jiri Kosina <jikos@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Josh Triplett <josh@...htriplett.org>,
        Greg KH <greg@...ah.com>, Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [RFC v1 02/14] bus1: provide stub cdev /dev/bus1

On Thu, Oct 27, 2016 at 6:37 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Thu, Oct 27, 2016 at 8:25 AM, Tom Gundersen <teg@...m.no> wrote:
>>
>> Could you elaborate on why you think syscalls would be more
>> appropriate than ioctls?
>
> ioctl's tend to be a horrid mess both for things like compat.but also
> for things like system call tracing and filtering (ie BPF).
>
> The compat mess is fixable by making sure you always use 64-bit fields
> rather than pointers everywhere and everything is aligned.

This we do.

> The
> tracing and filtering one not so much.

Got it. Thanks.

Tom