mips_cps_fir...e_in_cluster(9)

💅 mips_cps_first_online_in_cluster — from the Kernel API Manual, bestie 🎀

Okay so picture this: it's giving "am I the first one here?" energy, but for CPUs. That's literally the whole vibe of this page from the Kernel API Manual (mips_cps_fir...e_in_cluster(9), yes the title is truncated, we don't talk about it 💀).

✨ SYNOPSIS ✨

unsigned int mips_cps_first_online_in_cluster (int *first_cpu );

🌸 ARGUMENTS 🌸

• first_cpu — okay so this is the pointer where the answer gets dropped off. On exit it holds the first other online CPU in cluster, or nr_cpu_ids if the function returns true. So like, if you're the first one online, you get nr_cpu_ids in there instead of an actual CPU. No cap, that's just how it is 🫶

🦋 DESCRIPTION 🦋

Determine whether the local CPU is the first to be brought online in its cluster — meaning, are there any other online CPUs hanging out in the local cluster? It's the vibe check: is the group chat empty except for you, or are your besties already here?

Returns true if this CPU is first online, else false. Periodt. 💅

Lowkey important: true means "it's just me in here", and that's also exactly when *first_cpu ends up as nr_cpu_ids — the two facts are besties, iykyk.

👑 SEE ALSO 👑

Kernel file ./arch/mips/include/asm/mips-cps.h, plus the whole friend group:

• mips_cps_numclusters(9)
• mips_cps_cluster_config(9)
• mips_cps_numcores(9)
• mips_cps_numiocu(9)
• mips_cps_numvps(9)
• mips_cps_multicluster_cpus(9)

That's the whole read. Sourced from ./arch/mips/include/asm, stamped October 2026, page mips_cps_fir...e_in_cluster(9) — slay, go be the first online in your cluster bestie, we love that for you ✨💖🧚