linux-kernel - Re: [PATCH v3 1/7] ARM: sun8i: smp: Add support for A83T

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20180219090401.5uxmwtnkd7oadaxx@flea.lan>
Date:   Mon, 19 Feb 2018 10:04:01 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Mylène Josserand <mylene.josserand@...tlin.com>
Cc:     wens@...e.org, linux@...linux.org.uk, robh+dt@...nel.org,
        mark.rutland@....com, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        clabbe.montjoie@...il.com, thomas.petazzoni@...tlin.com,
        quentin.schulz@...tlin.com
Subject: Re: [PATCH v3 1/7] ARM: sun8i: smp: Add support for A83T

Hi,

On Mon, Feb 19, 2018 at 09:18:31AM +0100, Mylène Josserand wrote:
> Add the support for A83T.
> 
> A83T SoC has an additional register than A80 to handle CPU configurations:
> R_CPUS_CFG. Information about the register comes from Allwinner's BSP
> driver.
> An important difference is the Power Off Gating register for clusters
> which is BIT(4) in case of SUN9I-A80 and BIT(0) in case of SUN8I-A83T.
> 
> Signed-off-by: Mylène Josserand <mylene.josserand@...tlin.com>

This is some high-level review, but you should split this patch in
three:
  - One to refactor the current code to split the DT parsing function
    (and rename the function to sun9i_smp_dt_parse) and the variable renames
  - One to enable the A83t SMP (with the function called sun8i_a83t_smp_dt_parse)
  - One to enable the A83t hotplug (merged with your last patch)

Also, you're calling a lot of times of_machine_is_compatible, and this
is quite inefficient. You should call it once and store the result.

Thanks!
Maxime

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

Download attachment "signature.asc" of type "application/pgp-signature" (834 bytes)