linux-kernel - Re: [RFC V1 1/7] genirq/msi: Differentiate between various MSI based interrupts

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Date:   Fri, 13 Sep 2019 14:40:56 +0000
From:   Jason Gunthorpe <jgg@...lanox.com>
To:     Megha Dey <megha.dey@...ux.intel.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "maz@...nel.org" <maz@...nel.org>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "rafael@...nel.org" <rafael@...nel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "hpa@...or.com" <hpa@...or.com>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "ashok.raj@...el.com" <ashok.raj@...el.com>,
        "megha.dey@...el.com" <megha.dey@...el.com>,
        "jacob.jun.pan@...el.com" <jacob.jun.pan@...el.com>
Subject: Re: [RFC V1 1/7] genirq/msi: Differentiate between various MSI based
 interrupts

On Thu, Sep 12, 2019 at 06:32:02PM -0700, Megha Dey wrote:
> Since a device can support both MSI-X and IMS interrupts simultaneously,
> do away with is_msix and introduce a new enum msi_desc_tag to
> differentiate between the various types of msi_descs.

It would be clearer if this commit message explaind that this is a
cleanup creating a normal tagged union:

struct msi_desc {
 [..]
        union {
        
Where the tag says which of the elements in the union is filled in

> +enum msi_desc_tags {
> +	IRQ_MSI_TAG_MSI,
> +	IRQ_MSI_TAG_MSIX,
> +	IRQ_MSI_TAG_IMS,

And don't add IMS to the enum until you add a IMS member to the union.

Jason