scx_cmask_reframe(9)

💅 scx_cmask_reframe(9) 💅

okay bestie, welcome to the Kernel API Manual entry for this one — it’s giving “reshape the active range, but make it not resize storage.” ✨

🦋 NAME 🦋

scx_cmask_reframe — reshape @m’s active range without resizing storage. no cap, that’s the whole vibe.

🌸 SYNOPSIS 🌸

void scx_cmask_reframe (struct scx_cmask *m , u32 base , u32 nr_cids );

🎀 ARGUMENTS 🎀

• m — the cmask to reframe. main character cmask, literally.
• base — the new active range base. set the starting point, bestie.
• nr_cids — the new active range length; it must fit within m->alloc_words. like, non-negotiable. 💅

🔥 DESCRIPTION 🔥

okay so here’s the tea: body bits within the new range become garbage. 😭 That’s real. Only the head and tail words are zeroed, and that’s specifically to keep the padding invariant. So don’t expect a full clean sweep — just those two edges, periodt. ✨

🌈 SEE ALSO 🌈

Kernel file ./kernel/sched/ext/cid.h plus these iconique friends:

• cid_valid(9)
• __scx_cid_to_cpu(9)
• __scx_cpu_to_cid(9)
• scx_cid_to_cpu(9)
• scx_cpu_to_cid(9)
• scx_is_cid_type(9)
• __scx_cmask_init(9)
• scx_cmask_init(9)
• scx_cmask_test(9)
• scx_cmask_for_each_cid(9)

source/version: ./kernel/sched/ext • date: October 2026 — okay bye bestie, mwah 💋🫶