linux-kernel - Re: [PATCH] MIPS: No need to check CPU 0 in {loongson3,bmips,octeon}_cpu

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Message-ID: <31318f42-5b38-215e-bddc-cc77a8a1bc03@gmail.com>
Date:   Wed, 25 Nov 2020 09:06:43 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Huacai Chen <chenhc@...ote.com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>
Cc:     linux-mips@...r.kernel.org, bcm-kernel-feedback-list@...adcom.com,
        linux-kernel@...r.kernel.org, Xuefeng Li <lixuefeng@...ngson.cn>
Subject: Re: [PATCH] MIPS: No need to check CPU 0 in
 {loongson3,bmips,octeon}_cpu_disable()



On 11/25/2020 2:11 AM, Tiezhu Yang wrote:
> After commit 9cce844abf07 ("MIPS: CPU#0 is not hotpluggable"),
> c->hotpluggable is 0 for CPU 0 and it will not generate a control
> file in sysfs for this CPU:
> 
> [root@...ux loongson]# cat /sys/devices/system/cpu/cpu0/online
> cat: /sys/devices/system/cpu/cpu0/online: No such file or directory
> [root@...ux loongson]# echo 0 > /sys/devices/system/cpu/cpu0/online
> bash: /sys/devices/system/cpu/cpu0/online: Permission denied
> 
> So no need to check CPU 0 in {loongson3,bmips,octeon}_cpu_disable(),
> just remove them.
> 
> Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
> ---
>  arch/mips/cavium-octeon/smp.c | 3 ---
>  arch/mips/kernel/smp-bmips.c  | 3 ---

For smp-bmips.c:

Acked-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian