[Deepin-Kernel-SIG] [linux 7.2.y] deepin: x86: enable rcu nocb cpu default all

[opsiff]

The rcu lazy callbacks enabled by "deepin: x86: enable rcu lazy by default" take effect only on rcu_nocbs CPUs, that is, on the CPUs whose callbacks have been offloaded, so they cover no CPU unless the rcu_nocbs=all boot cmdline is passed. Enable
CONFIG_RCU_NOCB_CPU_DEFAULT_ALL to offload the callbacks of all CPUs by default, so that rcu lazy works with the default boot cmdline, and the rcu_nocbs boot parameter still takes precedence when specified.

Summary by Sourcery

Enhancements:

• Enable RCU callback offloading for all CPUs by default in the Deepin x86 desktop configuration so RCU lazy callbacks are effective without additional boot parameters while preserving boot-time overrides.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

The PR updates the Deepin x86 desktop defconfig to offload RCU callbacks on all CPUs by default, allowing the previously enabled RCU lazy-callback behavior to work with the default boot command line while retaining boot-time parameter control.

File-Level Changes

Change	Details	Files
Enable RCU callback offloading for all CPUs by default in the Deepin x86 desktop kernel configuration.	Add CONFIG_RCU_NOCB_CPU_DEFAULT_ALL to the desktop defconfig. Preserve the existing rcu_nocbs boot-parameter override behavior. Ensure RCU lazy callbacks are effective without requiring rcu_nocbs=all at boot.	arch/x86/configs/deepin_x86_desktop_defconfig

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[deepin-ci-robot]

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