task_css_is_root(9)

👑 task_css_is_root(9) 👑

okay bestie, welcome to the Kernel API Manual’s task_css_is_root(9) page — this one is literally a lil’ vibe check for cgroups.

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💖 NAME 💖

• task_css_is_root — test whether a task belongs to the root css

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✨ SYNOPSIS ✨

bool task_css_is_root (struct task_struct *task , int subsys_id );

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🎀 ARGUMENTS 🎀

• task — the target task
• subsys_id — the target subsystem ID

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🦋 DESCRIPTION 🦋

Test whether task belongs to the root css on the specified subsystem. May be invoked in any context. No cap, any context means any context 💅.

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🌸 SEE ALSO 🌸

Kernel file: ./include/linux/cgroup.h

• cgroup_subsys_enabled(9)
• cgroup_subsys_on_dfl(9)
• css_for_each_child(9)
• css_for_each_descendant_pre(9)
• css_for_each_descendant_post(9)
• cgroup_taskset_for_each(9)
• cgroup_taskset_for_each_leader(9)
• cgroup_css(9)
• css_is_dying(9)
• task_css_set_check(9)
• task_css_check(9)
• task_css_set(9)
• task_css(9)
• task_get_css(9)
• cgroup_is_descendant(9)
• cgroup_ancestor(9)
• cgroup_common_ancestor(9)
• task_under_cgroup_hierarchy(9)

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mwah 💋 — with love from ./include/linux, October 2026, on the task_css_is_root(9) page 🎀