linux-kernel - Re: [PATCH] MIPS: Loongson: Use CONFIG_NR_CPUS_DEFAULT

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Date:   Tue, 31 Mar 2020 15:05:33 +0800
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Huacai Chen <chenhc@...ote.com>
CC:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        Xuefeng Li <lixuefeng@...ngson.cn>
Subject: Re: [PATCH] MIPS: Loongson: Use CONFIG_NR_CPUS_DEFAULT_64 to support more CPUs



于 2020年3月31日 GMT+08:00 下午3:00:06, Tiezhu Yang <yangtiezhu@...ngson.cn> 写到:
>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@...ngson.cn>

Would 16 be a better option?
We have only 4 way platform.

>---
> 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

-- 
Jiaxun Yang