linux-kernel - Re: [PATCH v4 1/7] riscv: asm: alternative-macros: Introduce ALTERNATIVE

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Message-ID: <CA+V-a8uXxCupvW9eQGs4=XnertvZUfi_KVAF5SUcmqmPHT_+xA@mail.gmail.com>
Date:   Fri, 25 Nov 2022 10:36:21 +0000
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Heiko Stübner <heiko@...ech.de>
Cc:     Conor Dooley <conor@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Guo Ren <guoren@...nel.org>,
        Jisheng Zhang <jszhang@...nel.org>,
        Atish Patra <atishp@...osinc.com>,
        Anup Patel <apatel@...tanamicro.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Philipp Tomsich <philipp.tomsich@...ll.eu>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-renesas-soc@...r.kernel.org,
        Biju Das <biju.das.jz@...renesas.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH v4 1/7] riscv: asm: alternative-macros: Introduce
 ALTERNATIVE_3() macro

Hi Heiko,

On Fri, Nov 25, 2022 at 10:20 AM Heiko Stübner <heiko@...ech.de> wrote:
>
> Am Freitag, 25. November 2022, 11:02:21 CET schrieb Lad, Prabhakar:
> > Hi Heiko,
> >
> > On Thu, Nov 24, 2022 at 7:58 PM Heiko Stübner <heiko@...ech.de> wrote:
> > >
> > > Am Donnerstag, 24. November 2022, 20:52:33 CET schrieb Conor Dooley:
> > > > On Thu, Nov 24, 2022 at 05:22:01PM +0000, Prabhakar wrote:
> > > > > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > > > >
> > > > > Introduce ALTERNATIVE_3() macro.
> > > >
> > > > Bit perfunctory I think! There's a lovely comment down below that would
> > > > make for a better commit message if you were to yoink it.
> > > > Content looks about what I'd expect to see though.
> > >
> > > Also both the comment on the original ALTERNATIVE_2 and the new ALTERNATIVE_3
> > > should probably be merged into a single comment explaining this once for all
> > > ALTERNATIVE_x variants.
> > >
> > > Especially with the dma stuff, I'm pretty sure we'll get at least an ALTERNATIVE_4
> > > if not even more ;-) . So we defnitly don't want to repeat this multiple times.
> > >
> > Do agree. How about the below?
> >
> > /*
> >  * Similar to what ALTERNATIVE_2() macro does but with an additional
> >  * vendor content.
> >  */
> >
> > So the other ALTERNATIVE_2+() macros will keep on building on it.
>
> My idea was more like having _one_ comment block of something like
>
> -----
> /*
>  * ALTERNATIVE_x macros allow providing multiple replacement options
>  * for an ALTERNATIVE code section. This is helpful if multiple
>  * implementation variants for the same functionality exist for
>  * different cpu cores.
>  *
>  * Usage:
>  *   ALTERNATIVE_x(old_content,
>  *      new_content1, vendor_id1, errata_id1, CONFIG_k1,
>  *      new_content2, vendor_id2, errata_id2, CONFIG_k2,
>  *      ...
>  *      new_contentx, vendor_idx, errata_idx, CONFIG_kx)
>  */
>
> #define ALTERNATIVE_2(...)
> #define ALTERNATIVE_3(...)
> etc
> -----
>
LGTM, I'll include the above in the next version.

> So this would include dropping the old comment over ALTERNATIVE2
>
Agreed, I'll drop it in the same patch.

Cheers,
Prabhakar