linux-kernel - Re: [PATCH v4 7/7] x86/vdso: Move out the CPU number store

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Message-ID: <alpine.DEB.2.21.1806252140260.1587@nanos.tec.linutronix.de>
Date:   Mon, 25 Jun 2018 21:40:40 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     "H. Peter Anvin" <hpa@...or.com>
cc:     Andy Lutomirski <luto@...nel.org>,
        "Bae, Chang Seok" <chang.seok.bae@...el.com>,
        Ingo Molnar <mingo@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "Metzger, Markus T" <markus.t.metzger@...el.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v4 7/7] x86/vdso: Move out the CPU number store

On Mon, 25 Jun 2018, H. Peter Anvin wrote:

> On 06/25/18 08:40, Thomas Gleixner wrote:
> > On Fri, 22 Jun 2018, Andy Lutomirski wrote:
> > 
> >> On Fri, Jun 22, 2018 at 11:02 AM Bae, Chang Seok
> >> <chang.seok.bae@...el.com> wrote:
> >>>
> >>>> Still setup_cpu_number() sucks.
> >>>
> >>> How about setup_cpu_and_node_number()?
> >>
> >> setup_fast_cpu_node_nr()?  setup_cpunr_regs()?  I don't have any
> >> brilliant ideas.  Thomas?
> > 
> > It's really hard to find a good one. setup_cpu_node_cache() might work, but
> > it's not brilliant either.
> > 
> 
> Since this applies to the getcpu(2) system call (in addition to the
> kernel usage), perhaps setup_getcpu()?

Works for me.