generic_smp_...le_interrupt(9)

💖 generic_smp_call_function_single_interrupt — a Kernel API Manual moment 💖

okay so this is a page from the Kernel API Manual (yes, that manual, the one that lives in ./kernel and knows things) and it's about generic_smp_call_function_single_interrupt. Bestie. Sit down. It's giving "tiny function, huge responsibility" and we're gonna get into it ✨

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🌸 NAME 🌸

generic_smp_call_function_single_interrupt — literally just here to execute SMP IPI callbacks. That's the whole job. Iconic of it, honestly.

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🎀 SYNOPSIS 🎀

void generic_smp_call_function_single_interrupt (void );

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🦋 ARGUMENTS 🦋

• void — no arguments, babe. Zero. None. It takes nothing, it needs nothing, it's that confident 💅

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✨ DESCRIPTION ✨

Okay so the arch invokes this one to handle an IPI for call function single. That's the vibe. That's the assignment.

🚨 Important, no cap: it must be called with interrupts disabled. Not optional, not a suggestion, not a "eh it'll probably be fine". Disabled. Periodt. 😭

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👑 SEE ALSO 👑

Grab a snack, this list is a whole friend group 🫶 All of these live in the Kernel file ./kernel/smp.c:

• csd_lock_is_stuck(9)
• __flush_smp_call_function_queue(9)
• flush_smp_call_function_queue(9)
• smp_call_function_single(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)

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aaaand that's the page, bestie 🌈 quick sign-off before you go: this one's sourced from ./kernel with the October 2026 version date attached, and the whole thing goes by the very cute name generic_smp_...le_interrupt(9) 🎀 go forth and call it with your interrupts disabled, mwah 💋🔥