linux-kernel - Re: [PATCH v6 08/11] ARM: sun9i: smp: Add is

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Date:   Tue, 17 Apr 2018 13:19:02 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Mylène Josserand <mylene.josserand@...tlin.com>,
        Russell King <linux@...linux.org.uk>,
        Marc Zyngier <marc.zyngier@....com>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>, Simon <horms@...ge.net.au>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Magnus Damm <magnus.damm@...il.com>,
        "open list:ARM/SHMOBILE ARM..." <linux-renesas-soc@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        LABBE Corentin <clabbe.montjoie@...il.com>,
        Quentin Schulz <quentin.schulz@...tlin.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 08/11] ARM: sun9i: smp: Add is_sun8i field

On Tue, Apr 17, 2018 at 03:57:07PM +0800, Chen-Yu Tsai wrote:
> >> @@ -697,6 +700,8 @@ static int __init sunxi_mc_smp_init(void)
> >>                       break;
> >>       }
> >>
> >> +     is_sun8i = sunxi_mc_smp_data[i].is_sun8i;
> >> +
> >
> > Do we really need to cache it? Can't we just have a pointer to the SMP
> > data structure and use that instead?
> 
> I recommended that. We don't need any of the other fields in the SMP
> data structure once we're past the init phase. This saves a dereference
> or two.

Fair enough.

Maxime

-- 
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com

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