linux-kernel - Re: [PATCH v2 0/7] tty: add flag to suppress ready signalling on open

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Message-ID: <X9NOAypxyiS5M3Ze@localhost>
Date:   Fri, 11 Dec 2020 11:46:27 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Maarten Brock <m.brock@...mierlo.com>,
        Mychaela Falconia <mychaela.falconia@...il.com>,
        Johan Hovold <johan@...nel.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        "Mychaela N . Falconia" <falcon@...ecalypso.org>,
        linux-serial@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/7] tty: add flag to suppress ready signalling on open

On Thu, Dec 10, 2020 at 02:01:30PM +0100, Greg Kroah-Hartman wrote:
> O_DIRECT is an interesting hack, has anyone seen if it violates the
> posix rules for us to use it on a character device like this?

Jiri only mentioned O_DIRECT as an example of a flag which we might be
able to repurpose/abuse for this. O_DIRECT is linux-specific, not in
POSIX, so we'd still end up with a Linux-specific interface if we were
to take this route.

Johan