cpuhp_setup_state_nocalls(9)

💅 NAME 💅

okay so cpuhp_setup_state_nocalls — from the Kernel API Manual, bestie — is literally “Setup hotplug state callbacks without calling the @startup callback”. That’s the whole assignment. ✨

🌸 SYNOPSIS 🌸

int cpuhp_setup_state_nocalls (enum cpuhp_state state , const char *name , int (*startup)(unsigned int cpu) , int (*teardown)(unsigned int cpu) );

🎀 ARGUMENTS 🎀

• state — the state for which the calls are installed. that’s the vibe check for where this callback setup lives 💫
• name — name of the callback. yes, it needs a name, bestie 🏷️
• startup — startup callback function or NULL if not required. so if you don’t need it, pass NULL and keep it moving 🫶
• teardown — teardown callback function or NULL if not required. same deal: NULL is totally valid if you’re not using it 💅

🦋 DESCRIPTION 🦋

Same as cpuhp_setup_state except that the startup callback is not invoked during installation. so it’s giving “setup state callbacks, but make it no-startup-call” energy 😌

NOP if SMP=n or HOTPLUG_CPU=n. no cap, that’s the condition, periodt. 💀

💜 SEE ALSO 💜

start with the kernel file ./include/linux/cpuhotplug.h, then go off bestie:

• cpuhp_setup_state(9)
• cpuhp_setup_state_cpuslocked(9)
• cpuhp_setup_state_nocalls_cpuslocked(9)
• cpuhp_setup_state_multi(9)
• cpuhp_state_add_instance(9)
• cpuhp_state_add_instance_nocalls(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)

mwah 💋 this page came from ./include/linux, dated October 2026, and it’s serving Kernel API Manual realness — bye bestie, go slay your hotplug setup 🫶✨