linux-kernel - Re: [PATCH v5 1/6] riscv: asm: alternative-macros: Introduce ALTERNATIVE

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Date:   Mon, 19 Dec 2022 16:22:49 +0000
From:   Conor Dooley <conor@...nel.org>
To:     "Lad, Prabhakar" <prabhakar.csengg@...il.com>
Cc:     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>,
        Heiko Stuebner <heiko@...ech.de>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Samuel Holland <samuel@...lland.org>,
        Guo Ren <guoren@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.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-riscv@...ts.infradead.org,
        linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Biju Das <biju.das.jz@...renesas.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH v5 1/6] riscv: asm: alternative-macros: Introduce
 ALTERNATIVE_3() macro

On Mon, Dec 19, 2022 at 11:15:17AM +0000, Lad, Prabhakar wrote:
> > On Mon, Dec 12, 2022 at 11:55:00AM +0000, Prabhakar wrote:
> > > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > >
> > > Introduce ALTERNATIVE_3() macro.
> > >
> > > A vendor wants to replace an old_content, but another vendor has used
> > > ALTERNATIVE_2() to patch its customized content at the same location.
> > > In this case, this vendor can use macro ALTERNATIVE_3() and then replace
> > > ALTERNATIVE_2() with ALTERNATIVE_3() to append its customized content.
> > >
> > > While at it update comment above ALTERNATIVE_2() macro and make it generic
> > > so that the comment holds good for any new addition of ALTERNATIVE_X()
> > > macros.
> > >
> > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

> > > + *
> > > + * 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(old_content, new_content_1, vendor_id_1, errata_id_1, CONFIG_k_1,              \
> > >                                  new_content_2, vendor_id_2, errata_id_2, CONFIG_k_2)         \
> > >       _ALTERNATIVE_CFG_2(old_content, new_content_1, vendor_id_1, errata_id_1, CONFIG_k_1,    \
> > >                                       new_content_2, vendor_id_2, errata_id_2, CONFIG_k_2)
> > >
> > > +#define ALTERNATIVE_3(old_content, new_content_1, vendor_id_1, errata_id_1, CONFIG_k_1,              \
> > > +                                new_content_2, vendor_id_2, errata_id_2, CONFIG_k_2,         \
> > > +                                new_content_3, vendor_id_3, errata_id_3, CONFIG_k_3)         \
> > > +       _ALTERNATIVE_CFG_3(old_content, new_content_1, vendor_id_1, errata_id_1, CONFIG_k_1,  \
> > > +                                       new_content_2, vendor_id_2, errata_id_2, CONFIG_k_2,  \
> > > +                                       new_content_3, vendor_id_3, errata_id_3, CONFIG_k_3)
> >
> > btw, why is this indented with spaces when the line above it is indented
> > with tabs? (At least, that is how it appears in mutt).
> >
> I'll update it with spaces.

The file uses tabs, so it'd be switching the spaces you added with tabs,
right?

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