linux-kernel - Re: [PATCH 1/1] Fix undefined reference to 'node_reclaim

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Date:   Mon, 16 Dec 2019 13:21:01 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Gon Solo <gonsolo@...il.com>
Cc:     Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Linux-sh list <linux-sh@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] Fix undefined reference to 'node_reclaim_distance'.

Hi Gon,

Thanks for your patch!

On Mon, Dec 16, 2019 at 11:35 AM Gon Solo <gonsolo@...il.com> wrote:
> According to https://lkml.org/lkml/2019/12/16/101 and
> http://kisskb.ellerman.id.au/kisskb/buildresult/14067948/ building on
> sh4 is broken due to a
>
> page_alloc.c:(.text+0x3148): undefined reference to `node_reclaim_distance'.
>
> This only happens with CONFIG_NUMA=y (variable used with #ifdef
> CONFIG_NUMA at mm/page_alloc.c:3529) and CONFIG_SMP=n (variable defined at
> kernel/sched/topology.c:2291 but the whole file to be built depends on
> CONFIG_SMP in kernel/sched/Makefile:23.
>
> Follow the lead of arch/x86/Kconfig:1547 and depend on SMP.
>
> This assumes that there are no NUMA systems without SMP which is
> reasonable I guess.

Unfortunately that may be an x86-centric assumption: on other platforms,
there do exist systems with multiple memory banks with different access
performance figures.

> Signed-off-by: Gon Solo <gonsolo@...il.com>
> ---
>  arch/sh/mm/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig
> index 5c8a2ebfc720..cf655d8e8758 100644
> --- a/arch/sh/mm/Kconfig
> +++ b/arch/sh/mm/Kconfig
> @@ -108,7 +108,7 @@ config VSYSCALL
>
>  config NUMA
>         bool "Non Uniform Memory Access (NUMA) Support"
> -       depends on MMU && SYS_SUPPORTS_NUMA
> +       depends on MMU && SMP && SYS_SUPPORTS_NUMA
>         select ARCH_WANT_NUMA_VARIABLE_LOCALITY
>         default n
>         help

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