cpuhp_state_...ance_nocalls(9)

💅 cpuhp_state_add_instance_nocalls — like, the whole vibe

okay bestie so this is a page from the Kernel API Manual, and no cap it's one of those tiny ones that still matters, so let's get into it 🫶

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✨ NAME ✨

cpuhp_state_add_instance_nocalls — adds an instance for a state, and it does it without invoking the startup callback. literally that's the whole personality 💅

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🎀 SYNOPSIS 🎀

int cpuhp_state_add_instance_nocalls (enum cpuhp_state state , struct hlist_node *node );

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🦋 ARGUMENTS 🦋

• state — the state that this instance is getting installed for. it's giving "which shelf are we putting this on" energy 🗂️
• node — the node for this individual state, like the one specific item living on that shelf.

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🌸 DESCRIPTION 🌸

so it installs the instance for the state. easy. but heads up: the state has to have been marked as multi-instance earlier, by cpuhp_setup_state_multi. no shortcuts on that one, bestie, it's a prerequisite fr fr.

also: this whole thing is a NOP if SMP=n or HOTPLUG_CPU=n. so like, nothing happens. iconic of it honestly 💀

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🔥 SEE ALSO 🔥

the whole friend group, in the kernel file ./include/linux/cpuhotplug.h:

• cpuhp_setup_state(9)
• cpuhp_setup_state_cpuslocked(9)
• cpuhp_setup_state_nocalls(9)
• cpuhp_setup_state_nocalls_cpuslocked(9)
• cpuhp_setup_state_multi(9)
• cpuhp_state_add_instance(9)
• cpuhp_state_add_instance_nocalls_cpuslocked(9)
• cpuhp_remove_state(9)
• cpuhp_remove_state_nocalls(9)
• cpuhp_remove_state_nocalls_cpuslocked(9)
• cpuhp_remove_multi_state(9)
• cpuhp_state_remove_instance(9)
• cpuhp_state_remove_instance_nocalls(9)

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okay that's the page!! 🎀 tiny but mighty. this one lives over in ./include/linux and it's dated October 2026 — mwah 💋 go forth and add ur instances, bestie, and remember: no calls, no drama ✨🫶