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Date:   Sun, 19 Mar 2023 21:20:51 +0100
From:   John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To:     Randy Dunlap <rdunlap@...radead.org>, linux-kernel@...r.kernel.org
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>, linux-sh@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH 6/7 v4] sh: fix Kconfig entry for NUMA => SMP

On Sun, 2023-03-05 at 20:00 -0800, Randy Dunlap wrote:
> Fix SUPERH builds that select SYS_SUPPORTS_NUMA but do not select
> SYS_SUPPORTS_SMP and SMP.
> 
> kernel/sched/topology.c is only built for CONFIG_SMP and then the NUMA
> code + data inside topology.c is only built when CONFIG_NUMA is
> set/enabled, so these arch/sh/ configs need to select SMP and
> SYS_SUPPORTS_SMP to build the NUMA support.
> 
> Fixes this build error in multiple SUPERH configs:
> 
> mm/page_alloc.o: In function `get_page_from_freelist':
> page_alloc.c:(.text+0x2ca8): undefined reference to `node_reclaim_distance'
> 
> Fixes: 357d59469c11 ("sh: Tidy up dependencies for SH-2 build.")
> Fixes: 9109a30e5a54 ("sh: add support for sh7366 processor")
> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> Cc: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
> Cc: Yoshinori Sato <ysato@...rs.sourceforge.jp>
> Cc: Rich Felker <dalias@...c.org>
> Cc: linux-sh@...r.kernel.org
> Cc: stable@...r.kernel.org
> ---
> v2: skipped
> v3: skipped
> v4: refresh & resend
> 
>  arch/sh/Kconfig |    4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff -- a/arch/sh/Kconfig b/arch/sh/Kconfig
> --- a/arch/sh/Kconfig
> +++ b/arch/sh/Kconfig
> @@ -477,6 +477,8 @@ config CPU_SUBTYPE_SH7722
>  	select CPU_SHX2
>  	select ARCH_SHMOBILE
>  	select ARCH_SPARSEMEM_ENABLE
> +	select SYS_SUPPORTS_SMP
> +	select SMP
>  	select SYS_SUPPORTS_NUMA
>  	select SYS_SUPPORTS_SH_CMT
>  	select PINCTRL
> @@ -487,6 +489,8 @@ config CPU_SUBTYPE_SH7366
>  	select CPU_SHX2
>  	select ARCH_SHMOBILE
>  	select ARCH_SPARSEMEM_ENABLE
> +	select SYS_SUPPORTS_SMP
> +	select SMP
>  	select SYS_SUPPORTS_NUMA
>  	select SYS_SUPPORTS_SH_CMT
>  

It seems that we need this change for these configurations as well:

- config CPU_SHX3
- config CPU_SUBTYPE_SH7785

Although I can trigger a build failure for CPU_SUBTYPE_SH7785 only when
setting CONFIG_NUMA=y:

  CC      net/ipv6/addrconf_core.o
mm/slab.c: In function 'slab_memory_callback':
mm/slab.c:1127:23: error: implicit declaration of function 'init_cache_node_node'; did you mean 'drain_cache_node_node'? [-Werror=implicit-function-declaration]
 1127 |                 ret = init_cache_node_node(nid);
      |                       ^~~~~~~~~~~~~~~~~~~~
      |                       drain_cache_node_node

I would expect this error to be reproducible for CPU_SHX3 as well when
CONFIG_NUMA=y but CONFIG_SMP=n. But for some reason, I am not seeing
the error then.

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913

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