linux-kernel - Re: [PATCH 1/3] MIPS: loongson64: Drop call to irq_cpu

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Date:   Sun, 24 Oct 2021 17:28:46 +0200
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Marc Zyngier <maz@...nel.org>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        Serge Semin <fancer.lancer@...il.com>,
        Huacai Chen <chenhuacai@...nel.org>,
        Jiaxun Yang <jiaxun.yang@...goat.com>, f.fainelli@...il.com,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 1/3] MIPS: loongson64: Drop call to irq_cpu_offline()

On Thu, Oct 21, 2021 at 06:04:12PM +0100, Marc Zyngier wrote:
> Also loongson64 calls irq_cpu_offline(), none of its interrupt
> controllers implement the .irq_cpu_offline callback.
> 
> It is thus obvious that this call only serves the dubious purpose
> of wasting precious CPU cycles by iterating over all interrupts.
> 
> Get rid of the call altogether.
> 
> Signed-off-by: Marc Zyngier <maz@...nel.org>
> ---
>  arch/mips/loongson64/smp.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/arch/mips/loongson64/smp.c b/arch/mips/loongson64/smp.c
> index 09ebe84a17fe..660e1de4412a 100644
> --- a/arch/mips/loongson64/smp.c
> +++ b/arch/mips/loongson64/smp.c
> @@ -550,7 +550,6 @@ static int loongson3_cpu_disable(void)
>  	set_cpu_online(cpu, false);
>  	calculate_cpu_foreign_map();
>  	local_irq_save(flags);
> -	irq_cpu_offline();
>  	clear_c0_status(ST0_IM);
>  	local_irq_restore(flags);
>  	local_flush_tlb_all();
> -- 
> 2.30.2

Acked-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de>

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