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Date: Thu, 27 Aug 2020 10:31:33 +0800 From: hejinyang <hejinyang@...ngson.cn> To: Matthew Wilcox <willy@...radead.org> 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 08/26/2020 09:01 PM, Matthew Wilcox wrote: > 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? NUMA option normally work with more than two nodes, though Loongson64 use it default after patch 6fbde6b492dfc761ad60a68fb2cb32b1eb05b786. Loongson64(3A)'s each node consists of 4 cpus while it only has 4 cpus. In other words, it has only one node while open NUMA. I'm confused it if NUMA deponds on SMP. I'll try fix it with unabling NUMA and SMP later. Thanks.:-)
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