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From: Thomas Gleixner <tglx@linutronix.de>
To: Marc Zyngier <maz@kernel.org>, Florian Fainelli <f.fainelli@gmail.com>
Cc: linux-kernel@vger.kernel.org,
	Russell King <linux@armlinux.org.uk>, Ray Jui <rjui@broadcom.com>,
	Scott Branden <sbranden@broadcom.com>,
	"maintainer:BROADCOM BCM281XX/BCM11XXX/BCM216XX ARM ARCHITE..." 
	<bcm-kernel-feedback-list@broadcom.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Yoshinori Sato <ysato@users.sourceforge.jp>,
	Rich Felker <dalias@libc.org>, Rob Herring <robh+dt@kernel.org>,
	Frank Rowand <frowand.list@gmail.com>,
	Ard Biesheuvel <ardb@kernel.org>, Mike Rapoport <rppt@kernel.org>,
	Linus Walleij <linus.walleij@linaro.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Geert Uytterhoeven <geert+renesas@glider.be>,
	Arnd Bergmann <arnd@arndb.de>, Guenter Roeck <linux@roeck-us.net>,
	Kefeng Wang <wangkefeng.wang@huawei.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Andrey Konovalov <andreyknvl@gmail.com>,
	Anshuman Khandual <anshuman.khandual@arm.com>,
	Valentin Schneider <valentin.schneider@arm.com>,
	Ingo Molnar <mingo@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	"moderated list:ARM PORT" <linux-arm-kernel@lists.infradead.org>,
	"open list:SUPERH" <linux-sh@vger.kernel.org>,
	"open list:BROADCOM BMIPS MIPS ARCHITECTURE" 
	<linux-mips@vger.kernel.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE" 
	<devicetree@vger.kernel.org>
Subject: Re: [PATCH 03/11] genirq: Export irq_set_affinity_locked()
Date: Sat, 25 Sep 2021 23:21:38 +0200	[thread overview]
Message-ID: <87tui8cpwd.ffs@tglx> (raw)
In-Reply-To: <87tui8ub87.wl-maz@kernel.org>

On Sat, Sep 25 2021 at 12:48, Marc Zyngier wrote:
> On Fri, 24 Sep 2021 18:05:38 +0100, Florian Fainelli <f.fainelli@gmail.com> wrote:
>>  }
>> +EXPORT_SYMBOL_GPL(irq_set_affinity_locked);
>
> This doesn't seem right.
>
> This driver seem to try and move interrupts on its own when the CPU
> goes down. Why can't it rely on the normal CPU hotplug infrastructure
> to do so like all the other drivers (bar some Cavium driver that does
> the same thing)?
>
> I'd rather you take this opportunity to move these drivers into the
> 21st century, so that we can kill irq_cpu_offline() and co altogether.

I wanted to kill these callbacks years ago. Cavium has two variants of
those offline/online callbacks:

 1) octeon_irq_cpu_offline_ciu() which is doing the same as that BCM
    driver. These really can go away. Just remove the callback and
    everything just works.

 2) Two other variants to fiddle with chip internals, but those chips do
    not have an irq_affinity() callback which makes it more interesting.

    I don't see a proper way to solve that except for removing Cavium
    alltogether, but once the BCM one is gone, we just can make this
    muck depend on CAVIUM and be done with it. And I mean depend and not
    select.

Thanks,

        tglx



    

  reply	other threads:[~2021-09-25 21:21 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-24 17:05 [PATCH 00/11] Modular Broadcom irqchip drivers Florian Fainelli
2021-09-24 17:05 ` [PATCH 01/11] arch: Export cpu_logical_map to modules Florian Fainelli
2021-09-27 19:32   ` Rob Herring
2021-09-27 19:43     ` Florian Fainelli
2021-09-24 17:05 ` [PATCH 02/11] genirq: Export irq_to_desc() again " Florian Fainelli
2021-09-25 21:00   ` Thomas Gleixner
2021-09-26  2:29     ` Florian Fainelli
2021-09-24 17:05 ` [PATCH 03/11] genirq: Export irq_set_affinity_locked() Florian Fainelli
2021-09-25 11:48   ` Marc Zyngier
2021-09-25 21:21     ` Thomas Gleixner [this message]
2021-09-25 21:37       ` Thomas Gleixner
2021-09-27 17:47         ` Florian Fainelli
2021-09-27 18:18           ` Thomas Gleixner
2021-09-27 18:25             ` Florian Fainelli
2021-09-24 17:05 ` [PATCH 04/11] irqchip/irq-bcm7038-l1: Switch to IRQCHIP_PLATFORM_DRIVER Florian Fainelli
2021-09-24 17:05 ` [PATCH 05/11] irqchip/irq-brcmstb-l2: " Florian Fainelli
2021-09-24 17:05 ` [PATCH 06/11] genirq: Export irq_gc_{unmask_enable,mask_disable}_reg Florian Fainelli
2021-09-26  2:30   ` Florian Fainelli
2021-09-24 17:05 ` [PATCH 07/11] of/irq: Export of_irq_count to drivers Florian Fainelli
2021-09-27 19:08   ` Rob Herring
2021-09-27 19:28     ` Florian Fainelli
2021-09-27 19:43       ` Rob Herring
2021-09-27 19:49         ` Florian Fainelli
2021-09-27 20:09           ` Rob Herring
2021-09-28  8:10           ` Marc Zyngier
2021-09-24 17:05 ` [PATCH 08/11] genirq: Export irq_gc_noop() Florian Fainelli
2021-09-24 17:05 ` [PATCH 09/11] irqchip/irq-bcm7120-l2: Switch to IRQCHIP_PLATFORM_DRIVER Florian Fainelli
2021-09-24 17:05 ` [PATCH 10/11] arm64: broadcom: Removed forced select of interrupt controllers Florian Fainelli
2021-09-25 12:09   ` Marc Zyngier
2021-09-25 17:46     ` Arnd Bergmann
2021-09-24 17:05 ` [PATCH 11/11] ARM: bcm: " Florian Fainelli

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