STRUCT SMP_CALL_ON_CPU_STRUCT(9)

📦 version 7.3.1, in nixpkgs unstable

💅 struct smp_call_on_cpu_struct — NAME

ok so listen bestie: struct smp_call_on_cpu_struct is literally the whole vibe — it's the struct you use to Call a function on a specific CPU ✨ (yes that's the official job description, no cap).

this is from the Kernel API Manual, in case you were wondering where the lore comes from 🎀

🌸 SYNOPSIS

struct smp_call_on_cpu_struct {
    struct work_struct      work;
    struct completion       done;
    int (*func)(void *);
    void *data;
    int ret;
    int cpu;
 };

🦋 Members

  • work — a work_struct, aka the little work item that carries this whole operation. it's giving "the actual doer" energy 💅
  • done — a completion to signal. this is your "we're so back" notification, the thing that tells everybody the call finished 🫶
  • func — function to call. the main character, fr fr — it takes a void * and hands you back an int 👑
  • data — the function's data argument. whatever lil payload you're passing along to func 🍓
  • ret — the return value from func. whatever func decided to give back gets parked right here 📥
  • cpu — the target CPU, and heads up: -1 means any CPU, so pick that if you're feeling flexible ✨

💖 Description

ok so the tea ☕: this struct is used to call a function on a specific cpu and wait for it to return. like, you dispatch it, and then you sit there and wait, because patience is a virtue and also the whole design 🔥

optionally, you can also make sure the call is done on a specified physical cpu via vcpu pinning — which is the move when you wanna support virtualized environments 🧚 no cap, that's the whole point of that part.

🔍 SEE ALSO

Kernel file ./kernel/smp.c — and the whole friend group 💜:

and that's the whole page, bestie — go call a function on a CPU, you absolute icon 🌈

sign-off era 🎀: this one lives in ./kernel, stamped October 2026. periods, slay, mwah 💋
📦 where this page comes from