linux-kernel - Re: [PATCH] soc: renesas: select ERRATA_ANDES for R9A07G043 only when alternatives are present

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Message-ID: <CAMuHMdVojwgOP8bqHobgbsgUA+7yxUA7v5M6Z800zxrCeuxZjg@mail.gmail.com>
Date:   Mon, 9 Oct 2023 10:34:34 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Conor Dooley <conor.dooley@...rochip.com>
Cc:     linux-renesas-soc@...r.kernel.org, conor@...nel.org,
        Randy Dunlap <rdunlap@...radead.org>,
        Magnus Damm <magnus.damm@...il.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH] soc: renesas: select ERRATA_ANDES for R9A07G043 only when
 alternatives are present

Hi Conor,

On Mon, Oct 9, 2023 at 10:12 AM Conor Dooley <conor.dooley@...rochip.com> wrote:
> Randy reported a randconfig build issue against linux-next:
> WARNING: unmet direct dependencies detected for ERRATA_ANDES
>   Depends on [n]: RISCV_ALTERNATIVE [=n] && RISCV_SBI [=y]
>   Selected by [y]:
>   - ARCH_R9A07G043 [=y] && SOC_RENESAS [=y] && RISCV [=y] && NONPORTABLE [=y] && RISCV_SBI [=y]
>
> ../arch/riscv/errata/andes/errata.c:59:54: warning: 'struct alt_entry' declared inside parameter list will not be visible outside of this definition or declaration
>    59 | void __init_or_module andes_errata_patch_func(struct alt_entry *begin, struct alt_entry *end,
>
> On RISC-V, alternatives are not usable in XIP kernels, which this
> randconfig happened to select. Add a check for whether alternatives are
> available before selecting the ERRATA_ANDES config option.
>
> Reported-by: Randy Dunlap <rdunlap@...radead.org>
> Acked-by: Randy Dunlap <rdunlap@...radead.org>
> Tested-by: Randy Dunlap <rdunlap@...radead.org>
> Closes: https://lore.kernel.org/all/09a6b0f0-76a1-45e3-ab52-329c47393d1d@infradead.org/
> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>

Thanks for your patch!

> --- a/drivers/soc/renesas/Kconfig
> +++ b/drivers/soc/renesas/Kconfig
> @@ -343,7 +343,7 @@ config ARCH_R9A07G043
>         select ARCH_RZG2L
>         select AX45MP_L2_CACHE if RISCV_DMA_NONCOHERENT
>         select DMA_GLOBAL_POOL
> -       select ERRATA_ANDES if RISCV_SBI
> +       select ERRATA_ANDES if (RISCV_SBI && RISCV_ALTERNATIVE)

Perhaps ARCH_R9A07G043 should depend on RISCV_ALTERNATIVE (and
RISCV_SBI) instead?  It's not like RZ/Five is gonna work without the
Andes errata handling present (unless all of them are related to cache
handling, and we can run uncached; also see below)).

>         select ERRATA_ANDES_CMO if ERRATA_ANDES

And then this "if" can go as well.

Any other hard dependencies?
E.g. can RZ/Five work without RISCV_DMA_NONCOHERENT?

>         help
>           This enables support for the Renesas RZ/Five SoC.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds