linux-kernel - Re: [RFC PATCH for 4.17 02/21] rseq: Introduce restartable sequences system call (v12)

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Date:   Wed, 28 Mar 2018 14:52:16 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:     "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Andy Lutomirski <luto@...capital.net>,
        Dave Watson <davejwatson@...com>, linux-kernel@...r.kernel.org,
        linux-api@...r.kernel.org, Paul Turner <pjt@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Russell King <linux@....linux.org.uk>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>, Andrew Hunter <ahh@...gle.com>,
        Andi Kleen <andi@...stfloor.org>, Chris Lameter <cl@...ux.com>,
        Ben Maurer <bmaurer@...com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Josh Triplett <josh@...htriplett.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: [RFC PATCH for 4.17 02/21] rseq: Introduce restartable sequences
 system call (v12)

On Wed, Mar 28, 2018 at 02:29:46PM +0200, Peter Zijlstra wrote:
> > +static int rseq_get_rseq_cs(struct task_struct *t,
> > +			    unsigned long *start_ip,
> > +			    unsigned long *post_commit_offset,
> > +			    unsigned long *abort_ip,
> > +			    uint32_t *cs_flags)
> > +{

> 
> > +
> > +	*cs_flags = rseq_cs.flags;
> > +	*start_ip = rseq_cs.start_ip;
> > +	*post_commit_offset = rseq_cs.post_commit_offset;
> > +	*abort_ip = rseq_cs.abort_ip;
> 
> Then this becomes a straight struct assignment.

I initially suggested passing a structure instead of many arguments, but
then recondidered, mostly because it will be inlined (due to having only
the one caller) anyway. Still, maybe a struct will work better, I dunno.