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takedown_cpu() has a comment about "all preempt/rcu users must observe !cpu_active()" which is kind of meaningless in this function. This comment was originally introduced by commit6acce3ef84("sched: Remove get_online_cpus() usage") when _cpu_down() was setting cpu_active_mask and synchronize_rcu()/synchronize_sched() were added after that. Later commit40190a78f8("sched/hotplug: Convert cpu_[in]active notifiers to state machine") added a new CPUHP_AP_ACTIVE hotplug state to set/clear cpu_active_mask. The following commitb2454caa89("sched/hotplug: Move sync_rcu to be with set_cpu_active(false)") move the synchronize_*() calls to sched_cpu_deactivate() associated with the new hotplug state, but left the comment behind. Remove this comment as it is no longer relevant in takedown_cpu(). Signed-off-by: Waiman Long <longman@redhat.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/all/20250729191232.664931-1-longman@redhat.com
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.