cgroup_propagate_control(9)

💖 NAME 💖

okay bestie, welcome to cgroup_propagate_control(9) from the Kernel API Manual — this page is literally about refresh control masks of a subtree. no cap, that's the whole name. 🫶

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✨ SYNOPSIS ✨

the signature is exactly this, bestie — do not remix it:

void cgroup_propagate_control (struct cgroup *cgrp );

it's a void function, so it's not handing you a return value back; it's just out here doing the mask-refresh moment and dipping. 💅

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🎀 ARGUMENTS 🎀

• cgrp — the root of the target subtree. that's the starting point for this whole propagation situation. 🌸

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🦋 DESCRIPTION 🦋

so here's the vibe, bestie:

• for cgrp and its subtree, ensure ->subtree_ss_mask matches ->subtree_control.
• propagate controller availability through the subtree so that descendants don't have unavailable controllers enabled.

it's giving “make the subtree's controller mask situation actually line up.” 🔥

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🌈 SEE ALSO 🌈

the source file is ./kernel/cgroup/cgroup.c, and here's the entire reference squad — yes, all of them, no skipping, periodt:

• Kernel file: ./kernel/cgroup/cgroup.c
• cgroup_ssid_enabled(9)
• cgroup_on_dfl(9)
• cgroup_e_css_by_mask(9)
• cgroup_e_css(9)
• cgroup_get_e_css(9)
• __cgroup_task_count(9)
• cgroup_task_count(9)
• for_each_css(9)
• do_each_subsys_mask(9)
• css_set_populated(9)
• css_update_populated(9)
• css_set_update_populated(9)
• css_set_move_task(9)
• compare_css_sets(9)
• find_existing_css_set(9)
• allocate_cgrp_cset_links(9)
• link_css_set(9)
• find_css_set(9)
• cgroup_file_mode(9)
• cgroup_calc_subtree_ss_mask(9)
• cgroup_kn_unlock(9)
• cgroup_kn_lock_live(9)
• css_clear_dir(9)
• css_populate_dir(9)
• cgroup_attach_lock(9)
• cgroup_attach_unlock(9)
• cgroup_migrate_add_task(9)
• cgroup_taskset_first(9)
• cgroup_taskset_next(9)
• cgroup_migrate_execute(9)
• cgroup_migrate_vet_dst(9)
• cgroup_migrate_finish(9)
• cgroup_migrate_add_src(9)
• cgroup_migrate_prepare_dst(9)
• cgroup_migrate(9)
• cgroup_attach_task(9)
• cgroup_update_dfl_csses(9)
• cgroup_lock_and_drain_offline(9)
• cgroup_save_control(9)
• cgroup_restore_control(9)
• cgroup_apply_control_enable(9)
• cgroup_apply_control_disable(9)
• cgroup_apply_control(9)
• cgroup_finalize_control(9)
• cgroup_enable_threaded(9)
• cgroup_tryget_css(9)
• cgroup_addrm_files(9)
• cgroup_rm_cftypes(9)
• cgroup_add_cftypes(9)
• cgroup_add_dfl_cftypes(9)
• cgroup_add_legacy_cftypes(9)
• cgroup_file_notify(9)
• cgroup_file_show(9)
• css_next_child(9)
• css_next_descendant_pre(9)
• css_rightmost_descendant(9)
• css_next_descendant_post(9)
• css_has_online_children(9)
• css_task_iter_advance_css_set(9)
• css_task_iter_start(9)
• css_task_iter_next(9)
• css_task_iter_end(9)
• css_create(9)
• kill_css_sync(9)
• kill_css_finish(9)
• cgroup_destroy_locked(9)
• cgroup_init_early(9)
• cgroup_init(9)
• cgroup_fork(9)
• cgroup_v1v2_get_from_file(9)
• cgroup_get_from_file(9)
• cgroup_css_set_fork(9)
• cgroup_css_set_put_fork(9)
• cgroup_can_fork(9)
• cgroup_cancel_fork(9)
• cgroup_post_fork(9)
• cgroup_task_exit(9)
• css_tryget_online_from_dir(9)
• css_from_id(9)
• cgroup_get_from_path(9)
• cgroup_v1v2_get_from_fd(9)
• cgroup_get_from_fd(9)
• cgroup_parse_float(9)

bye bestie, mwah 💋 — source/version: ./kernel/cgroup; date: October 2026; page: cgroup_propagate_control(9) 💖✨