linux-kernel - Re: [PATCH v9 0/2] genirq: s390/pci: Migrate MSI interrupts to irqdomain API

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Message-ID: <20251204112017.30109A70-hca@linux.ibm.com>
Date: Thu, 4 Dec 2025 12:20:17 +0100
From: Heiko Carstens <hca@...ux.ibm.com>
To: Tobias Schumacher <ts@...ux.ibm.com>
Cc: Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Niklas Schnelle <schnelle@...ux.ibm.com>,
        Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
        Gerd Bayer <gbayer@...ux.ibm.com>, Halil Pasic <pasic@...ux.ibm.com>,
        Matthew Rosato <mjrosato@...ux.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
        linux-s390@...r.kernel.org, Farhan Ali <alifm@...ux.ibm.com>
Subject: Re: [PATCH v9 0/2] genirq: s390/pci: Migrate MSI interrupts to
 irqdomain API

On Thu, Dec 04, 2025 at 06:05:00AM +0100, Tobias Schumacher wrote:
> This patch series reworks the PCIe interrupt handling on s390 by
> migrating it to use a proper MSI parent domain. Introducing a dedicated
> MSI domain hierarchy aligns s390 PCIe support with the generic Linux IRQ
> domain model. Currently s390 is one of the last architectures still using
> the legacy API.

Is there any reason why this should be squeezed into the current merge
window? Would it make somebody's life significantly easier?

Otherwise this has to wait until the next merge window.

> Tobias Schumacher (2):
>       genirq: Change hwirq parameter to irq_hw_number_t
>       s390/pci: Migrate s390 IRQ logic to IRQ domain API
> 
>  arch/s390/Kconfig           |   1 +
>  arch/s390/include/asm/pci.h |   5 +
>  arch/s390/pci/pci.c         |   6 +
>  arch/s390/pci/pci_bus.c     |  18 ++-
>  arch/s390/pci/pci_irq.c     | 332 +++++++++++++++++++++++++++++---------------
>  include/linux/irqdesc.h     |   6 +-
>  kernel/irq/irqdesc.c        |   6 +-
>  7 files changed, 253 insertions(+), 121 deletions(-)

Series applied.