linux-kernel - Re: [PATCH v2 -next] riscv: mm: fix build errors caused by mk

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Message-ID: <CAMuHMdU6ngi50vXn--fNDy6BCOz=U34FDhw7iHvqKrNQqSHw-w@mail.gmail.com>
Date:   Tue, 22 Jun 2021 16:03:35 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Nanyong Sun <sunnanyong@...wei.com>
Cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>,
        Atish Patra <atish.patra@....com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: Re: [PATCH v2 -next] riscv: mm: fix build errors caused by mk_pmd()

On Thu, Jun 17, 2021 at 11:28 AM Nanyong Sun <sunnanyong@...wei.com> wrote:
> With "riscv: mm: add THP support on 64-bit", mk_pmd() function
> introduce build errors,
> 1.build with CONFIG_ARCH_RV32I=y:
> arch/riscv/include/asm/pgtable.h: In function 'mk_pmd':
> arch/riscv/include/asm/pgtable.h:513:9: error: implicit declaration of function 'pfn_pmd';
>  did you mean 'pfn_pgd'? [-Werror=implicit-function-declaration]
>
> 2.build with CONFIG_SPARSEMEM=y && CONFIG_SPARSEMEM_VMEMMAP=n
> arch/riscv/include/asm/pgtable.h: In function 'mk_pmd':
> include/asm-generic/memory_model.h:64:14: error: implicit declaration of function 'page_to_section';
>  did you mean 'present_section'? [-Werror=implicit-function-declaration]
>
> Move the definition of mk_pmd to pgtable-64.h to fix the first error.
> Use macro definition instead of inline function for mk_pmd
> to fix the second problem. It is similar to the mk_pte macro.
>
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Nanyong Sun <sunnanyong@...wei.com>

Thanks, this fixes my rv32 build.
Works fine with litex-rebase on VexRiscv.
No regression on BeagleV Starlight-beta.

Tested-by: Geert Uytterhoeven <geert@...ux-m68k.org>

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