cpumask_first_and_and(9)

📦 version 7.3.1, in nixpkgs unstable

💖 cpumask_first_and_and — Kernel API Manual ✨

okay so bestie, sit down, because this little icon of a function is about to make your whole cpu-mask life easier 💅

🌸 NAME 🌸

cpumask_first_and_and — literally returns the first cpu from *srcp1 & *srcp2 & *srcp3 🎀

✨ SYNOPSIS ✨

unsigned int cpumask_first_and_and (const struct cpumask *srcp1 , const
       struct cpumask *srcp2 , const struct cpumask *srcp3 );

no cap, that's the whole signature 🫶

🦋 ARGUMENTS 🦋

  • srcp1 — the first input 👑
  • srcp2 — the second input 👑
  • srcp3 — the third input 👑 (yes girl, three of them, it's giving three-way AND)

🌈 RETURN 🌈

>= nr_cpu_ids if no cpus are set in all of them 🫠 — so like, if the intersection comes up empty, you're not getting a real cpu id back, periodt.

💀 heads up bestie: you gotta check that return value yourself. An empty overlap means you get something >= nr_cpu_ids, not a cute little error code.

🎀 SEE ALSO 🎀

the whole friend group is in the group chat, iykyk 💖 Kernel file ./include/linux/cpumask.h

okay that's the whole page bestie, you ate that 🍓✨ this gem lives in ./include/linux and the manual was dated October 2026 — go forth and intersect those masks, main character energy only 💜🧚

📦 where this page comes from