linux-kernel - Re: [PATCH 1/4] ns: prepare time namespace for clone3()

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Message-ID: <20200318111726.u2r3ghymexyng5nn@wittgenstein>
Date:   Wed, 18 Mar 2020 12:17:26 +0100
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     Cyrill Gorcunov <gorcunov@...il.com>
Cc:     Adrian Reber <areber@...hat.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        Pavel Emelyanov <ovzxemul@...il.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Andrei Vagin <avagin@...il.com>, linux-kernel@...r.kernel.org,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Radostin Stoyanov <rstoyanov1@...il.com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 1/4] ns: prepare time namespace for clone3()

On Wed, Mar 18, 2020 at 01:57:47PM +0300, Cyrill Gorcunov wrote:
> On Tue, Mar 17, 2020 at 09:30:41AM +0100, Adrian Reber wrote:
> ...
> > +/*
> > + * This structure is used to set the time namespace offset
> > + * via /proc as well as via clone3().
> > + */
> > +struct set_timens_offset {
> > +	int			clockid;
> > +	struct timespec64	val;
> > +};
> > +
> 
> I'm sorry, I didn't follow this series much so can't comment right now.
> Still this structure made me a bit wonder -- the @val seems to be 8 byte
> aligned and I guess we have a useless pad between these members. If so
> can we swap them? Or it is already part of api?

It's not part of the api yet. We're still arguing about how and what we
want to pass down.