linux-kernel - [PATCH v7 05/24] x86/apic/vector: Skip cleanup for the NMI vector

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Message-Id: <20230301234753.28582-6-ricardo.neri-calderon@linux.intel.com>
Date:   Wed,  1 Mar 2023 15:47:34 -0800
From:   Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
To:     Tony Luck <tony.luck@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Len Brown <len.brown@...el.com>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        Stephane Eranian <eranian@...gle.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Ricardo Neri <ricardo.neri@...el.com>,
        linuxppc-dev@...ts.ozlabs.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org,
        Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
Subject: [PATCH v7 05/24] x86/apic/vector: Skip cleanup for the NMI vector

The NMI vector is fixed. No cleanup is needed after updating affinity.

Cc: Andi Kleen <ak@...ux.intel.com>
Cc: "Ravi V. Shankar" <ravi.v.shankar@...el.com>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: iommu@...ts.linux-foundation.org
Cc: linuxppc-dev@...ts.ozlabs.org
Signed-off-by: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>

---
Changes since v6:
 * Introduced this patch.

Changes since v5:
 * N/A

Changes since v4:
 * N/A

Changes since v3:
 * N/A

Changes since v2:
 * N/A

Changes since v1:
 * N/A
---
 arch/x86/kernel/apic/vector.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
index a4cf041427cb..3045823ecc1b 100644
--- a/arch/x86/kernel/apic/vector.c
+++ b/arch/x86/kernel/apic/vector.c
@@ -1050,6 +1050,10 @@ void send_cleanup_vector(struct irq_cfg *cfg)
 {
 	struct apic_chip_data *apicd;
 
+	/* NMI has a fixed vector. No vector management required. */
+	if (cfg->delivery_mode == APIC_DELIVERY_MODE_NMI)
+		return;
+
 	apicd = container_of(cfg, struct apic_chip_data, hw_irq_cfg);
 	if (apicd->move_in_progress)
 		__send_cleanup_vector(apicd);
-- 
2.25.1