scx_cmask_fill(9)

💅 scx_cmask_fill — from the Kernel API Manual (section 9, kernel space only, no userland shenanigans) 🎀

okay bestie, sit down, hydrate, and let's talk about scx_cmask_fill ✨ this one's a little cutie from the scx_cmask family and honestly she's giving "just do one thing and do it well" energy 👑

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🌸 NAME 🌸

scx_cmask_fill — sets every single bit in @m's active range 🫶

Like, all of them. The whole active range. Filled. Done. Slay.

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✨ SYNOPSIS ✨

void scx_cmask_fill (struct scx_cmask *m );

no return value, no drama, she just does the thing 💅

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🦋 ARGUMENTS 🦋

• m — the cmask to fill 🌈 (yes that's the whole argument list, she's low maintenance)

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💖 DESCRIPTION 💖

So here's the vibe: scx_cmask_fill is the literal counterpart to scx_cmask_clear 🔁 one of them turns the bits on, one of them turns the bits off, and they're besties about it.

She sets every bit in @m's active range — and that's it. Anything stored past the active range? Not her business, not her problem, she leaves it as is 🙈 no cap, she will not touch it.

fr fr: "leaves storage past the active range as is" is not a bug, it's the spec. Don't come for her 💀

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🧚 SEE ALSO 🧚

the whole friend group 💜 go say hi:

• the kernel file ./kernel/sched/ext/cid.c 👑
• scx_cid_publish_tables(9)
• scx_cid_retire_tables(9)
• scx_cid_init(9)
• scx_cmask_clear(9) — the counterpart bestie, the one she's literally defined against 🥹
• scx_bpf_cid_override(9)
• scx_bpf_cid_to_cpu(9)
• scx_bpf_cpu_to_cid(9)
• scx_cmask_subset(9)
• scx_cmask_empty(9)
• scx_bpf_cid_topo(9)
• scx_cmask_ref_init(9)
• scx_cmask_ref_init_kern(9)
• scx_cmask_ref_shard(9)
• scx_cmask_ref_or(9)
• scx_cmask_ref_copy(9)
• scx_cmask_ref_from_cpumask(9)

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that's the whole page, bestie, you ate that 🍓 this icon lives in ./kernel/sched/ext and the version stamp says October 2026 ⭐ manual section 9, kernel API manual, main character energy only 💅✨

periodt. 🦋