update_prstate(9)

okay bestie, welcome to update_prstate(9) from the Kernel API Manual 💖 — this is the cpuset partition-root-state page, and we’re gonna read it like a group chat, but with all the facts intact ✨

🌸 NAME 🌸

• update_prstate — update partition_root_state

🦋 SYNOPSIS 🦋

int update_prstate (struct cpuset *cs , int new_prs );

🎀 ARGUMENTS 🎀

• cs — the cpuset to update, aka the main character cpuset getting the update 💅
• new_prs — the new partition root state, like the fresh state you’re setting ✨

💖 RETURN 💖

0 if successful, != 0 if error. That’s the whole vibe check: zero means slay, nonzero means something went sideways 😭

🔥 DESCRIPTION 🔥

okay so the one big rule, no cap: call this with cpuset_mutex held 🔒. That’s literally the lock situation specified here, bestie.

🌈 SEE ALSO 🌈

the kernel file for this whole cpuset saga is ./kernel/cgroup/cpuset.c, and here’s the full bestie lineup, all of them, fr fr:

• cpuset_lock(9)
• cpuset_full_lock(9)
• partition_is_populated(9)
• alloc_cpumasks(9)
• alloc_tmpmasks(9)
• free_tmpmasks(9)
• dup_or_alloc_cpuset(9)
• free_cpuset(9)
• cpus_excl_conflict(9)
• cpuset_update_tasks_cpumask(9)
• compute_effective_cpumask(9)
• compute_effective_nodemask(9)
• rm_siblings_excl_cpus(9)
• update_parent_effective_cpumask(9)
• compute_partition_effective_cpumask(9)
• update_sibling_cpumasks(9)
• validate_partition(9)
• partition_cpus_change(9)
• update_cpumask(9)
• update_exclusive_cpumask(9)
• cpuset_update_tasks_nodemask(9)
• cpuset_css_alloc(9)
• cpuset_init(9)
• cpuset_hotplug_update_tasks(9)
• cpuset_handle_hotplug(9)
• cpuset_init_smp(9)
• cpuset_cpus_allowed_locked(9)
• cpuset_cpus_allowed(9)
• cpuset_cpus_allowed_fallback(9)
• cpuset_mems_allowed(9)
• cpuset_nodemask_valid_mems_allowed(9)
• cpuset_nodes_allowed(9)
• cpuset_spread_node(9)
• cpuset_mem_spread_node(9)
• cpuset_mems_allowed_intersects(9)
• cpuset_print_current_mems_allowed(9)

okay bye bestie — source/version ./kernel/cgroup, date October 2026, page update_prstate(9), mwah 💋