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Date:   Wed, 26 Aug 2020 14:01:22 +0100
From:   Matthew Wilcox <willy@infradead.org>
To:     Jinyang He <hejinyang@loongson.cn>
Cc:     Huacai Chen <chenhc@lemote.com>,
        Jiaxun Yang <jiaxun.yang@flygoat.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, Tiezhu Yang <yangtiezhu@loongson.cn>,
        Xuefeng Li <lixuefeng@loongson.cn>
Subject: Re: [PATCH] MIPS: Loongson: Fix complie errors without CONFIG_SMP
Message-ID: <20200826130122.GR17456@casper.infradead.org>
References: <1598446407-8845-1-git-send-email-hejinyang@loongson.cn>
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On Wed, Aug 26, 2020 at 08:53:27PM +0800, Jinyang He wrote:
> +++ b/arch/mips/include/asm/mach-loongson64/topology.h
> @@ -4,7 +4,11 @@
>  
>  #ifdef CONFIG_NUMA
>  
> +#ifdef CONFIG_SMP
>  #define cpu_to_node(cpu)	(cpu_logical_map(cpu) >> 2)
> +#else
> +#define cpu_to_node(cpu)	0
> +#endif

Are you saying you've enabled NUMA without enabling SMP?  Does that make
sense?