linux-kernel - Re: [PATCH v7 18/31] arm64: smp: Support non-SGIs for IPIs

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Message-ID: <sy2u3iyyfqk7ynccsb4lpbkto6pmkhamnlkkhf3mmh5dr47iyf@wmygyxypb26v>
Date: Tue, 15 Jul 2025 09:14:49 -0700
From: Breno Leitao <leitao@...ian.org>
To: Lorenzo Pieralisi <lpieralisi@...nel.org>
Cc: Marc Zyngier <maz@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Catalin Marinas <catalin.marinas@....com>, 
	Will Deacon <will@...nel.org>, Arnd Bergmann <arnd@...db.de>, 
	Sascha Bischoff <sascha.bischoff@....com>, Jonathan Cameron <Jonathan.Cameron@...wei.com>, 
	Timothy Hayes <timothy.hayes@....com>, Bjorn Helgaas <bhelgaas@...gle.com>, 
	"Liam R. Howlett" <Liam.Howlett@...cle.com>, Peter Maydell <peter.maydell@...aro.org>, 
	Mark Rutland <mark.rutland@....com>, Jiri Slaby <jirislaby@...nel.org>, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-pci@...r.kernel.org
Subject: Re: [PATCH v7 18/31] arm64: smp: Support non-SGIs for IPIs

Hello Lorenzo,

On Tue, Jul 15, 2025 at 06:07:48PM +0200, Lorenzo Pieralisi wrote:
> On Tue, Jul 15, 2025 at 04:34:24PM +0200, Lorenzo Pieralisi wrote:
> > Thank you for reporting it.
> > 
> > Does this patch below fix it ?
> 
> FWIW it does for me. I think you are booting with pseudo-nmi enabled and

> the below is a silly thinko (mea culpa) that is causing the IPI IRQ descs not
> to be set-up correctly for NMI and the prepare_percpu_nmi() call rightly
> screams on them.

Thanks for the quick reply. I don't see that warning anymore once this
patch is applied, so, the patch fixes the warning.

Regarding NMI, you are correct, I am using `CONFIG_ARM64_PSEUDO_NMI=y`
and `irqchip.gicv3_pseudo_nmi=1`

> If you confirm I hope it can be folded into the relevant patch.

Feel free to add "Tested-by: Breno Leitao <leitao@...ian.org>", if
pertinent.

Thanks for the quick fix,
--breno