linux-kernel - Re: SH: error: implicit declaration of function 'init_cache_node

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Date:   Sun, 14 Nov 2021 23:04:53 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     LKML <linux-kernel@...r.kernel.org>, Linux-MM <linux-mm@...ck.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>, Rich Felker <dalias@...c.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>
Subject: Re: SH: error: implicit declaration of function 'init_cache_node_node'

On Sun, Nov 14, 2021 at 2:17 AM Randy Dunlap <rdunlap@...radead.org> wrote:
>
> on arch/sh/,
> CONFIG_SMP is not defined,
> CONFIG_NUMA=y,
> CONFIG_MEMORY_HOTPLUG is not defined:
>
> ../mm/slab.c: In function 'slab_memory_callback':
> ../mm/slab.c:1143:23: error: implicit declaration of function 'init_cache_node_node'; did you mean 'drain_cache_node_node'? [-Werror=implicit-function-declaration]
>   1143 |                 ret = init_cache_node_node(nid);
>
>
> commit 76af6a054da4
> Author: Dave Hansen <dave.hansen@...ux.intel.com>
> Date:   Mon Oct 18 15:15:32 2021 -0700
>
>      mm/migrate: add CPU hotplug to demotion #ifdef
>
>
> How should we handle this config?

I think we can safely assume that NUMA without SMP is not a useful
configuration on SH and add a dependency in Kconfig for it.

I assume this came from some randconfig build rather than a config
that someone was intentionally using? My guess would be that testing
sh randconfig kernels is not overly productive as you likely need
countless patches before there is a chance of it working most of
the time. I haven't tried this myself, but I spend a lot of time fixing
randconfig failures on arm and x86, and I whenever I try any other
architecture, there is simply too much work needed upfront.

        Arnd