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

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Message-ID: <20201127093245.GB4859@alpha.franken.de>
Date:   Fri, 27 Nov 2020 10:32:45 +0100
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Tiezhu Yang <yangtiezhu@...ngson.cn>
Cc:     Huacai Chen <chenhc@...ote.com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        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 Wed, Nov 25, 2020 at 06:11:30PM +0800, 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 ---
>  arch/mips/loongson64/smp.c    | 3 ---
>  3 files changed, 9 deletions(-)

applied to mips-next.

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]