linux-kernel - RE: [patch V2 27/33] genirq/msi: Provide constants for PCI/IMS support

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Date:   Thu, 24 Nov 2022 03:01:44 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
CC:     "x86@...nel.org" <x86@...nel.org>, Joerg Roedel <joro@...tes.org>,
        "Will Deacon" <will@...nel.org>,
        "linux-pci@...r.kernel.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>,
        Jason Gunthorpe <jgg@...lanox.com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        "Raj, Ashok" <ashok.raj@...el.com>, Jon Mason <jdmason@...zu.us>,
        Allen Hubbe <allenbh@...il.com>
Subject: RE: [patch V2 27/33] genirq/msi: Provide constants for PCI/IMS
 support

> From: Thomas Gleixner <tglx@...utronix.de>
> Sent: Monday, November 21, 2022 10:38 PM
>  /**
> --- a/include/linux/msi_api.h
> +++ b/include/linux/msi_api.h
> @@ -15,6 +15,7 @@ struct device;
>   */
>  enum msi_domain_ids {
>  	MSI_DEFAULT_DOMAIN,
> +	MSI_SECONDARY_DOMAIN,
>  	MSI_MAX_DEVICE_IRQDOMAINS,

SECONDARY or be explicit IMS? Are we envisioning non-IMS usages to
occupy this slot in the future?