linux-kernel - Re: [PATCH v3 01/14] MIPS: BMIPS: Remove use of irq_cpu

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Date:   Sun, 3 Oct 2021 18:09:05 +0200
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        "maintainer:BROADCOM BCM281XX/BCM11XXX/BCM216XX ARM ARCHITE..." 
        <bcm-kernel-feedback-list@...adcom.com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        "moderated list:ARM SUB-ARCHITECTURES" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:MIPS" <linux-mips@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH v3 01/14] MIPS: BMIPS: Remove use of irq_cpu_offline

On Tue, Sep 28, 2021 at 11:21:26AM -0700, Florian Fainelli wrote:
> irq_cpu_offline() is only used by MIPS and we should instead use
> irq_migrate_all_off_this_cpu(). This will be helpful in order to remove
> drivers/irqchip/irq-bcm7038-l1.c irq_cpu_offline callback which would
> have got in the way of making this driver modular.
> 
> Suggested-by: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
>  arch/mips/Kconfig            | 1 +
>  arch/mips/kernel/smp-bmips.c | 3 ++-
>  2 files changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
> index 771ca53af06d..2c03b27cec02 100644
> --- a/arch/mips/Kconfig
> +++ b/arch/mips/Kconfig
> @@ -1782,6 +1782,7 @@ config CPU_BMIPS
>  	select CPU_HAS_PREFETCH
>  	select CPU_SUPPORTS_CPUFREQ
>  	select MIPS_EXTERNAL_TIMER
> +	select GENERIC_IRQ_MIGRATION if HOTPLUG_CPU
>  	help
>  	  Support for BMIPS32/3300/4350/4380 and BMIPS5000 processors.
>  
> diff --git a/arch/mips/kernel/smp-bmips.c b/arch/mips/kernel/smp-bmips.c
> index b6ef5f7312cf..f5d7bfa3472a 100644
> --- a/arch/mips/kernel/smp-bmips.c
> +++ b/arch/mips/kernel/smp-bmips.c
> @@ -26,6 +26,7 @@
>  #include <linux/bug.h>
>  #include <linux/kernel.h>
>  #include <linux/kexec.h>
> +#include <linux/irq.h>
>  
>  #include <asm/time.h>
>  #include <asm/processor.h>
> @@ -373,7 +374,7 @@ static int bmips_cpu_disable(void)
>  
>  	set_cpu_online(cpu, false);
>  	calculate_cpu_foreign_map();
> -	irq_cpu_offline();
> +	irq_migrate_all_off_this_cpu();
>  	clear_c0_status(IE_IRQ5);
>  
>  	local_flush_tlb_all();

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

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