linux-kernel - Re: [patch 15/39] PCI/MSI: Get rid of PCI_MSI_IRQ

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Message-ID: <Y3UjsjX0T6+03RzL@nvidia.com>
Date:   Wed, 16 Nov 2022 13:53:54 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        linux-pci@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Marc Zyngier <maz@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dave Jiang <dave.jiang@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Ashok Raj <ashok.raj@...el.com>, Jon Mason <jdmason@...zu.us>,
        Allen Hubbe <allenbh@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        linuxppc-dev@...ts.ozlabs.org,
        "Ahmed S. Darwish" <darwi@...utronix.de>,
        Reinette Chatre <reinette.chatre@...el.com>
Subject: Re: [patch 15/39] PCI/MSI: Get rid of PCI_MSI_IRQ_DOMAIN

On Fri, Nov 11, 2022 at 02:54:38PM +0100, Thomas Gleixner wrote:
> What a zoo:
> 
>      PCI_MSI
> 	select GENERIC_MSI_IRQ
> 
>      PCI_MSI_IRQ_DOMAIN
>      	def_bool y
> 	depends on PCI_MSI
> 	select GENERIC_MSI_IRQ_DOMAIN
> 
> Ergo PCI_MSI enables PCI_MSI_IRQ_DOMAIN which in turn selects
> GENERIC_MSI_IRQ_DOMAIN. So all the dependencies on PCI_MSI_IRQ_DOMAIN are
> just an indirection to PCI_MSI.
> 
> Match the reality and just admit that PCI_MSI requires
> GENERIC_MSI_IRQ_DOMAIN.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> ---
>  arch/um/drivers/Kconfig                 |    1 
>  arch/um/include/asm/pci.h               |    2 -
>  arch/x86/Kconfig                        |    1 
>  arch/x86/include/asm/pci.h              |    4 +-
>  drivers/pci/Kconfig                     |    8 +----
>  drivers/pci/controller/Kconfig          |   30 +++++++++-----------
>  drivers/pci/controller/dwc/Kconfig      |   48 ++++++++++++++++----------------
>  drivers/pci/controller/mobiveil/Kconfig |    6 ++--
>  drivers/pci/msi/Makefile                |    2 -
>  drivers/pci/probe.c                     |    2 -
>  include/linux/msi.h                     |   32 ++++++---------------
>  11 files changed, 56 insertions(+), 80 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Jason