linux-kernel - Re: [PATCH v4 16/26] genirq: Allow per-cpu interrupt sharing for non-overlapping affinities

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Message-ID: <aTKjsz4TkqmPN678@aspen.lan>
Date: Fri, 5 Dec 2025 09:19:47 +0000
From: Daniel Thompson <danielt@...nel.org>
To: Marc Zyngier <maz@...nel.org>
Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-acpi@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Mark Rutland <mark.rutland@....com>, Will Deacon <will@...nel.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Saravana Kannan <saravanak@...gle.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Sven Peter <sven@...nel.org>, Janne Grunau <j@...nau.net>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	James Clark <james.clark@...aro.org>,
	Jonathan Cameron <jonathan.cameron@...wei.com>,
	Jinjie Ruan <ruanjinjie@...wei.com>,
	Alexandru Elisei <alexandru.elisei@....com>,
	linux-mips@...r.kernel.org
Subject: Re: [PATCH v4 16/26] genirq: Allow per-cpu interrupt sharing for
 non-overlapping affinities

On Thu, Dec 04, 2025 at 02:21:51PM +0000, Marc Zyngier wrote:
> On Thu, 04 Dec 2025 10:56:13 +0000,
> Daniel Thompson <danielt@...nel.org> wrote:
> > CPU 0 Unable to handle kernel paging request at virtual address 0000000000000000, epc == ffffffff801c2398, ra == ffffffff801bab00
> > Oops[#1]:
> > CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.18.0-next-20251204 #20 NONE
> > Hardware name: mti,malta
> > $ 0   : 0000000000000000 0000000000000001 0000000000000000 0000000000000000
> > $ 4   : 0000000000000001 a8000000020e8008 0000000000000000 ffffffff80c23b80
> > $ 8   : 0000000000000004 0000000000000000 0000000000000000 000000000000002f
> > $12   : a8000000020f4000 0000000000003ff0 0000000000003000 0000000000000003
> > $16   : ffffffff80d095c0 ffffffff80ceb410 0000000000000019 ffffffff80c378c0
> > $20   : ffffffff80c4bec8 0000000000000000 ffffffff80e00000 ffffffff80de0000
> > $24   : 0000000000000000 0000000000000010
> > $28   : ffffffff80c20000 a8000000020f7ec0 a800000000e12fcd ffffffff801bab00
> > epc   : ffffffff801c2398 handle_percpu_devid_irq+0xb8/0x250
> > ra    : ffffffff801bab00 handle_irq_desc+0x48/0x88
> > Status: 1400a4e2	KX SX UX KERNEL EXL
> > Cause : 00800408 (ExcCode 02)
> > BadVA : 0000000000000000
> > PrId  : 0001a900 (MIPS I6400)
> > Modules linked in:
> > Process swapper/0 (pid: 0, threadinfo=(____ptrval____), task=(____ptrval____), tls=0000000000000000)
> > Stack : ffffffff80c35a2c 0000000000000002 ffffffff80e00000 0fffffffffffffff
> >         ffffffff80c50000 0000000000000001 0000000000000003 ffffffff801bab00
> >         0000000000000000 ffffffff805d82a8 0000000000000000 0000000000000008
> >         0000000000000000 0000000000000000 0000000000000000 5189d95a7a4f4800
> >         a800000002014300 0000000000000002 0000000000000001 000000000000001f
> >         ffffffff80e00000 0000000000000004 0000000000000000 ffffffff801bab00
> >         0000000000000000 ffffffff809ec128 0000000000000001 fffffffffffffffb
> >         0000000000000001 ffffffff805d7ebc 0000000000000000 0000000000000000
> >         ffffffff80c23c80 ffffffff80c50000 ffffffff80de0000 ffffffff80db0000
> >         0000000000000000 ffffffff80112f10 ffffffff80c23c80 0000000000000000
> > Call Trace:
> > [<ffffffff801c2398>] handle_percpu_devid_irq+0xb8/0x250
> > [<ffffffff801bab00>] handle_irq_desc+0x48/0x88
> > [<ffffffff805d82a8>] gic_irq_dispatch+0xc0/0x288
> > [<ffffffff801bab00>] handle_irq_desc+0x48/0x88
> > [<ffffffff809ec128>] do_domain_IRQ+0x28/0x40
> > [<ffffffff805d7ebc>] plat_irq_dispatch+0x64/0xe8
> > [<ffffffff80112f10>] handle_int+0x134/0x140
> > [<ffffffff80110dc8>] calibrate_delay+0x158/0x290
> > [<ffffffff80d58e48>] start_kernel+0x754/0x7a4
>
> This hack fixes it for me, but really, mips needs to grow up and stop
> using these antiquated APIs.

I can't comment on that. Literally the only thing I ever do on MIPS is
test kgdb ;-) .


> Can please you give it a go?

Looks good to me.

Local testing on MIPS worked nicely and I got a successful build back
for the kgdb tests:
https://gitlab.com/daniel-thompson/linux/-/pipelines/2196473049


Daniel.