linux-kernel - Re: [PATCH] MIPS: Loongson: Fix complie errors without CONFIG

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Date:   Wed, 26 Aug 2020 14:01:22 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Jinyang He <hejinyang@...ngson.cn>
Cc:     Huacai Chen <chenhc@...ote.com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Xuefeng Li <lixuefeng@...ngson.cn>
Subject: Re: [PATCH] MIPS: Loongson: Fix complie errors without CONFIG_SMP

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?