Re: [PATCH] MIPS: Loongson: Fix complie errors without CONFIG_SMP

[hejinyang]

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.:-)