deepin: config: arm64: disable pseudo-NMI support

[opsiff]

Drop CONFIG_ARM64_PSEUDO_NMI from the arm64 desktop defconfig.

This option builds support for NMI-like interrupts using GIC interrupt priorities. Even though pseudo-NMI mode still requires the runtime irqchip.gicv3_pseudo_nmi=1 parameter before high-priority interrupts are used, enabling the Kconfig option keeps the priority-masking code paths compiled in for arm64 exception and interrupt handling.

When the option is enabled, the kernel has to support PMR-based IRQ masking through ICC_PMR_EL1, save and restore the PMR state in exception entry code, and branch through pseudo-NMI-aware IRQ handling paths. That adds overhead to hot interrupt/exception paths and can reduce performance on desktop systems that do not need pseudo-NMI diagnostics.

Leave it disabled by default for the deepin arm64 desktop configuration.

Improved unixbench benchmark by 0.5%.

Summary by Sourcery

Enhancements:

• Disable ARM64 pseudo-NMI support in the deepin desktop defconfig to reduce interrupt and exception handling overhead on systems that do not require it.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

The arm64 desktop defconfig no longer enables CONFIG_ARM64_PSEUDO_NMI, avoiding pseudo-NMI-related code and hot-path overhead while retaining the default configuration for systems that do not use pseudo-NMI diagnostics.

File-Level Changes

Change	Details	Files
Disable pseudo-NMI support in the deepin arm64 desktop kernel configuration.	Remove CONFIG_ARM64_PSEUDO_NMI from the defconfig so PMR-based masking, PMR exception-state handling, and pseudo-NMI IRQ paths are not compiled by default. Target reduced interrupt and exception-path overhead for desktop systems without pseudo-NMI requirements; the reported UnixBench improvement is 0.5%.	arch/arm64/configs/deepin_arm64_desktop_defconfig

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[Copilot]

🟢 Approval recommended

The configuration change correctly disables an option that defaults to off and matches the stated purpose.

Pull request overview

Disables arm64 pseudo-NMI support in the Deepin desktop kernel configuration to reduce interrupt-path overhead.

Changes:

• Removes CONFIG_ARM64_PSEUDO_NMI=y from the arm64 desktop defconfig.

File summaries

File	Description
arch/arm64/configs/deepin_arm64_desktop_defconfig	Disables pseudo-NMI support.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Balanced

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