cpumask_weight(9)

📦 version 7.3.1, in nixpkgs unstable

💅 cpumask_weight(9) — the cpumask_weight page, bestie edition 🎀

okay so this is a page from the Kernel API Manual, and it's genuinely one of the little icon functions you'll keep reaching for once you know it exists. no cap.

✨ NAME ✨

cpumask_weight — literally just counts the bits in *srcp. that's it. that's the whole gig. 👑

🌸 SYNOPSIS 🌸

unsigned int cpumask_weight (const struct cpumask *srcp );

🦋 ARGUMENTS 🦋

  • srcp — the cpumask you want to count bits in. and yes, the bits are < nr_cpu_ids, so don't go expecting it to count random garbage past that. 🫶

💖 RETURN 💖

the count of bits set in *srcp. that's the number you get back. slay. ✨

🧚 SEE ALSO 🧚

this is the part where the friend group gets introduced, and honestly it's a big friend group. the kernel file this all lives in is ./include/linux/cpumask.h, and here's everyone:

lowkey the whole cpumask cinematic universe lives in ./include/linux/cpumask.h, so that's your main character location if you wanna go read more. 📖

and that's the page!! brought to you by the Kernel API Manual, source path ./include/linux, dated October 2026, version cpumask_weight(9). go count some bits, bestie, you're gonna eat 💅✨

📦 where this page comes from