Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:7 as permitted sender) client-ip=2620:137:e000::3:7;
From:   Thomas Gleixner <tglx@linutronix.de>
To:     Andrew Cooper <andrew.cooper3@citrix.com>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@linux.intel.com>, x86@kernel.org,
        "H. Peter Anvin" <hpa@zytor.com>, Steve Wahl <steve.wahl@hpe.com>,
        Justin Ernst <justin.ernst@hpe.com>,
        Kyle Meyer <kyle.meyer@hpe.com>,
        Dimitri Sivanich <dimitri.sivanich@hpe.com>,
        Russ Anderson <russ.anderson@hpe.com>,
        Darren Hart <dvhart@infradead.org>,
        Andy Shevchenko <andy@infradead.org>,
        "K. Y. Srinivasan" <kys@microsoft.com>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        Wei Liu <wei.liu@kernel.org>, Dexuan Cui <decui@microsoft.com>,
        Lorenzo Pieralisi <lpieralisi@kernel.org>,
        Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= <kw@linux.com>,
        Rob Herring <robh@kernel.org>,
        Bjorn Helgaas <bhelgaas@google.com>
Cc:     linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org,
        linux-hyperv@vger.kernel.org, linux-pci@vger.kernel.org,
        Andrew Cooper <andrew.cooper3@citrix.com>
Subject: Re: [PATCH 1/3] x86/apic: Drop apic::delivery_mode
In-Reply-To: <20231102-x86-apic-v1-1-bf049a2a0ed6@citrix.com>
References: <20231102-x86-apic-v1-0-bf049a2a0ed6@citrix.com>
 <20231102-x86-apic-v1-1-bf049a2a0ed6@citrix.com>
Date:   Sat, 04 Nov 2023 20:13:26 +0100
Message-ID: <8734xljprd.ffs@tglx>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

On Thu, Nov 02 2023 at 12:26, Andrew Cooper wrote:
> This field is set to APIC_DELIVERY_MODE_FIXED in all cases, and is read
> exactly once.  Fold the constant in uv_program_mmr() and drop the field.
>
> Searching for the origin of the stale HyperV comment reveals commit
> a31e58e129f7 ("x86/apic: Switch all APICs to Fixed delivery mode") which
> notes:
>
>   As a consequence of this change, the apic::irq_delivery_mode field is
>   now pointless, but this needs to be cleaned up in a separate patch.
>
> 6 years is long enough for this technical debt to have survived.

Guilty as charged. :)

Thanks for spotting this and cleaning it up!

       tglx