trace_ipi_entry(9)

💅 trace_ipi_entry — kernel API manual, bestie edition ✨

okay so this is a page from the Kernel API Manual and it's about one very specific little function, and honestly? she's serving "blink and you'll miss her" but we're gonna give her the full main character treatment. 💖

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✨ NAME ✨

trace_ipi_entry — the function that gets called, like, immediately before the IPI handler runs 🎀

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🌸 SYNOPSIS 🌸

void trace_ipi_entry (const char *reason );

that's it. that's the whole signature. void in, void out, one pointer in the middle. slay. 💅

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🦋 ARGUMENTS 🦋

• reason — a string that identifies what the IPI is actually for. like, the vibe of the IPI. the whole point of it. 🫶

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💜 DESCRIPTION 💜

okay so listen, this part is important, no cap: reason has to be a static string declared with __tracepoint_string. not kidding. it's literally necessary — the manpage says "necessary," which is manpage-speak for "do not mess with me on this." 😭

and ideally? it should be the same string you used with trace_ipi_raise for that IPI. same string, same IPI, matching set, coordinated outfit energy. ykyk. 👑

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🌈 SEE ALSO 🌈

• kernel file ./include/trace/events/ipi.h
• trace_ipi_raise(9)
• trace_ipi_exit(9)

like, go read the whole friend group, they all hang out together fr fr. 🧚

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lowkey a warning that's just me being a good friend: if your reason isn't a static string declared with __tracepoint_string, you're not doing the thing. periodt. 💀

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and that's the page!! 🍓 this one came from the source/version line ./include/trace/events, dated October 2026 — so if you're reading this in some other timeline, hi, ily, check your local docs. bye bestie!! 💖✨🎀🦋🌸💅🫶