bpf_cpumask_clear_cpu(9)

📦 version 7.3.1, in nixpkgs unstable

💅 bpf_cpumask_clear_cpu(9) — a Kernel API Manual moment

okay bestie, so this is bpf_cpumask_clear_cpu(9) from the Kernel API Manual, and it's literally a one-job icon: it clears the bit for a CPU in a BPF cpumask. that's the whole vibe. 🎀

✨ NAME ✨

bpf_cpumask_clear_cpu — clear a bit for a CPU in a BPF cpumask. that's it, that's the function, she's focused and she's serving 🫶

🌸 SYNOPSIS 🌸

__bpf_kfunc void bpf_cpumask_clear_cpu (u32 cpu , struct bpf_cpumask *cpumask );

look at her. __bpf_kfunc, returns void, two args. no notes. 💅

🦋 ARGUMENTS 🦋

  • cpu — the CPU to be cleared from the cpumask. like, this specific CPU's bit is getting yeeted out of the mask. bye boo 👋
  • cpumask — the BPF cpumask in which a bit is being cleared. this is the mask that's getting edited, and yeah, she's the main character here 👑

💖 SEE ALSO 💖

okay this is the friend group, and honestly they're all iconic. first up, the kernel file itself: ./kernel/bpf/cpumask.c, plus struct bpf_cpumask(9), and then the whole squad:

ngl, bpf_cpumask_set_cpu(9) is literally her counterpart — one sets, one clears, it's giving duality 🌈 and bpf_cpumask_test_and_clear_cpu(9) is the combo meal if you wanna check and clear, iykyk 😭

fr fr, if you're clearing a bit, make sure that mask is actually somewhere you're allowed to be touching. this page won't hold your hand on that one 🫶

okay that's the whole page, no cap — and before you go, the receipts: this one lives under ./kernel/bpf, it's the October 2026 edition of bpf_cpumask_clear_cpu(9). go clear some bits bestie, you're gonna slay 💖✨🎀🦋

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