linux-kernel - RE: [patch 08/20] genirq/msi: Make MSI descriptor iterators device domain aware

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Date:   Fri, 18 Nov 2022 07:57:01 +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>,
        "Ahmed S. Darwish" <darwi@...utronix.de>,
        "Chatre, Reinette" <reinette.chatre@...el.com>
Subject: RE: [patch 08/20] genirq/msi: Make MSI descriptor iterators device
 domain aware

> From: Thomas Gleixner <tglx@...utronix.de>
> Sent: Friday, November 11, 2022 9:57 PM
> 
> +/* Invalid XA index which is outside of any searchable range */
> +#define MSI_XA_MAX_INDEX	(ULONG_MAX - 1)
> +#define MSI_XA_DOMAIN_SIZE	(MSI_MAX_INDEX + 1)
> +

Out of curiosity. Other places treat MSI_MAX_INDEX - 1 as the upper
bound of a valid range. This size definition here implies that the last ID
is wasted for every domain. Is it intended?