task_function_call(9)

💖 task_function_call(9) 💖

okay bestie, welcome to the Kernel API Manual page for task_function_call(9) — it's the little helper that calls a function on the cpu where a task is running ✨

🌸 NAME 🌸

task_function_call — call a function on the cpu on which a task runs 🫶

✨ SYNOPSIS ✨

int task_function_call (struct task_struct *p , remote_function_f func ,
void *info );

🎀 ARGUMENTS 🎀

• p — the task to evaluate 👀
• func — the function to be called 📞
• info — the function call argument 🎁

💅 DESCRIPTION 💅

So like, it calls the function func when the task is currently running. lowkey it might be on the current CPU, and in that case it just calls the function directly — no drama, no extra hop 💫

It will retry due to any failures in smp_call_function_single, such as if the task_cpu goes offline concurrently. concurrently is doing a lot of work there, so keep that in mind, bestie.

It returns the func return value or -ESRCH or -ENXIO when the process isn't running. periodt. 💀

🦋 SEE ALSO 🦋

• Kernel file ./kernel/events/core.c 🌈
• cpu_function_call(9) 👑
• sys_perf_event_open(9) 🔥
• perf_event_create_kernel_counter(9) ⭐

mwah 💋 this page is serving source/version ./kernel/events, dated October 2026, and it's literally the task_function_call(9) manual — ily, go read the kernel now 🧚‍♀️💜