linux-kernel - Re: [PATCH 2/4] LoongArch: Make cpumask_of_node() robust against NUMA_NO

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Message-ID: <CAAhV-H4e9NOuO0ZyYfa1W1CyDnJVuuUDNEOavMS9o+h-u8PzLw@mail.gmail.com>
Date: Mon, 5 Jan 2026 20:54:46 +0800
From: Huacai Chen <chenhuacai@...nel.org>
To: John Garry <john.g.garry@...cle.com>
Cc: kernel@...0n.name, jiaxun.yang@...goat.com, tsbogend@...ha.franken.de, 
	tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, 
	dave.hansen@...ux.intel.com, hpa@...or.com, luto@...nel.org, 
	peterz@...radead.org, arnd@...db.de, x86@...nel.org, 
	loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	linux-mips@...r.kernel.org, linux-arch@...r.kernel.org, vulab@...as.ac.cn, 
	gregkh@...uxfoundation.org, rafael@...nel.org, dakr@...nel.org
Subject: Re: [PATCH 2/4] LoongArch: Make cpumask_of_node() robust against NUMA_NO_NODE

Hi, John,

On Mon, Jan 5, 2026 at 6:07 PM John Garry <john.g.garry@...cle.com> wrote:
>
> The arch definition of cpumask_of_node() cannot handle NUMA_NO_NODE - which
> is a valid index - so add a check for this.
>
> Signed-off-by: John Garry <john.g.garry@...cle.com>
> ---
>  arch/loongarch/include/asm/topology.h | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/arch/loongarch/include/asm/topology.h b/arch/loongarch/include/asm/topology.h
> index f06e7ff25bb7c..9857e4c20023c 100644
> --- a/arch/loongarch/include/asm/topology.h
> +++ b/arch/loongarch/include/asm/topology.h
> @@ -12,7 +12,9 @@
>
>  extern cpumask_t cpus_on_node[];
>
> -#define cpumask_of_node(node)  (&cpus_on_node[node])
> +#define cpumask_of_node(node)  ((node) == NUMA_NO_NODE ?       \
> +                               cpu_all_mask :                  \
> +                               &cpus_on_node[node])
You can define it in one line, so does the MIPS version.

Huacai

>
>  struct pci_bus;
>  extern int pcibus_to_node(struct pci_bus *);
> --
> 2.43.5
>