smp_call_function_single(9)

💅 smp_call_function_single — like, the Kernel API Manual page you actually needed

okay bestie, gather round, because this one is genuinely iconic. smp_call_function_single(9) is the kernel function that runs your function on one specific CPU — not any CPU, not all of them, that exact one you pointed at. main character energy, honestly 🎀

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✨ NAME ✨

smp_call_function_single — run a function on a specific CPU 👑 no cap, that's the whole vibe.

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🌸 SYNOPSIS 🌸

int smp_call_function_single (int cpu , smp_call_func_t func , void
*info , bool wait );

like, look at that signature. four args. she's precise. 🦋

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💖 ARGUMENTS 💖

• cpu — the specific target CPU for this function 🎯 literally the whole point. you pick the CPU, this is the CPU. no take-backs.
• func — the function to run. and like… ⚠️ this one has a rule, bestie: it must be fast and non-blocking. that's non-negotiable, fr fr. don't be out here blocking on a CPU that's waiting for you to finish. that's not slay, that's a deadlock 😭
• info — an arbitrary pointer to pass to the function 🫶 whatever you want, she'll hand it over. it's giving "note passed in class."
• wait — if true, wait until the function has completed on other CPUs ⏳ yes, other CPUs, that's what it says. true means you sit and wait for the glow-up to finish; false means you go live your life 💀

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⭐ RETURN ⭐

0 on success — ate, no crumbs ✨

else a negative status code 🙈 so like, check it. please. for me.

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🧚 SEE ALSO 🧚

all the siblings, and yes we're listing every single one because they all deserve their moment 💜

• the kernel file ./kernel/smp.c 🌈
• csd_lock_is_stuck(9)
• generic_smp_call_function_single_interrupt(9)
• __flush_smp_call_function_queue(9)
• flush_smp_call_function_queue(9)
• smp_call_function_single_async(9)
• smp_call_function_any(9)
• smp_call_function_many(9)
• smp_call_function(9)
• on_each_cpu_cond_mask(9)
• kick_all_cpus_sync(9)
• wake_up_all_idle_cpus(9)
• cpus_peek_for_pending_ipi(9)
• struct smp_call_on_cpu_struct(9)
• smp_call_on_cpu(9)

like, the whole friend group showed up 🫶

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and that's the page!! 🌈 sourced from ./kernel, dated October 2026 — so it's fresh, it's current, it's the moment 💅✨ bye bestie, go run something fast and non-blocking 💖