Re: [PATCH] MIPS: Loongson: Use CONFIG_NR_CPUS_DEFAULT_64 to support more CPUs

[Tiezhu Yang]

On 03/31/2020 03:05 PM, Jiaxun Yang wrote:

> ä 2020å3æ31æ GMT+08:00 äå3:00:06, Tiezhu Yang <yangtiezhu@xxxxxxxxxxx> åå:
> > When I update the mainline kernel on the Loongson 2-way platform which
> > has 8 CPUs, it only shows 4 CPUs due to NR_CPUS is 4, this is obviously
> > wrong.
> >
> > In order to support more CPUs on the Loongson platform, it is better
> > to use CONFIG_NR_CPUS_DEFAULT_64 instead of CONFIG_NR_CPUS_DEFAULT_4
> > to specify the maximum number of CPUs which the kernel will support.
> >
> > Signed-off-by: Tiezhu Yang <yangtiezhu@xxxxxxxxxxx>
> Would 16 be a better option?
> We have only 4 way platform.

There maybe have more than 4 cores per CPU or more than 4 ways
in the future, so I think 64 is better, otherwise we need to
modify this configuration once more.

> > ---
> > arch/mips/Kconfig | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
> > index a1f973c..a0b11f5 100644
> > --- a/arch/mips/Kconfig
> > +++ b/arch/mips/Kconfig
> > @@ -475,7 +475,7 @@ config MACH_LOONGSON64
> > 	select ISA
> > 	select I8259
> > 	select IRQ_MIPS_CPU
> > -	select NR_CPUS_DEFAULT_4
> > +	select NR_CPUS_DEFAULT_64
> > 	select USE_GENERIC_EARLY_PRINTK_8250
> > 	select SYS_HAS_CPU_LOONGSON64
> > 	select SYS_HAS_EARLY_PRINTK