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

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Date:   Thu, 27 Oct 2016 09:37:42 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Tom Gundersen <teg@...m.no>
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 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.  The
tracing and filtering one not so much.

                    Linus