cpuset_for_e...scendant_pre(9)

🌸 NAME 🌸

cpuset_for_each_descendant_pre — a pre-order walk of a cpuset's descendants, bestie 💅

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✨ SYNOPSIS ✨

cpuset_for_each_descendant_pre (des_cs , pos_css , root_cs );

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🎀 ARGUMENTS 🎀

• des_cs — your loop cursor, aka the little pointer that's currently vibing on whichever descendant we're visiting rn 🦋
• pos_css — the thing used for iteration. it's giving "keep track of where we are" energy ✨
• root_cs — the target cpuset whose ancestors we're walking. the main character of this whole operation 👑

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💖 DESCRIPTION 💖

Okay so here's the tea ☕ — this macro walks des_cs through all the online descendants of root_cs. fr fr, that's the whole vibe.

⚠️ Important: you must use this with RCU read locked. no cap, don't skip that part or things get cursed 💀

The caller is allowed to modify pos_css by calling css_rightmost_descendant to skip a whole subtree — lowkey iconic if you wanna prune the walk early 🙈

And yes, root_cs is included in the iteration, and it's literally the first node to be visited. it gets the VIP treatment first 🎟️✨

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🌈 SEE ALSO 🌈

• Kernel file ./kernel/cgroup/cpuset-internal.h
• cpuset_for_each_child(9) 🫶

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that's a wrap, bestie 🎀 this page came from ./kernel/cgroup, dated October 2026, and it's all about cpuset_for_e...scendant_pre(9) — slay, go read the source, ily 💜