trace_ipi_raise(9)

💅 trace_ipi_raise(9) — the Kernel API Manual, bestie edition 🎀

okay so this is a page from the Kernel API Manual (yes, that's the manual name, we're fancy), and it's about trace_ipi_raise — the little function that gets called when a smp cross call is made. that's it. that's the vibe. ✨

🌸 NAME 🌸

trace_ipi_raise — called when a smp cross call is made 🦋

✨ SYNOPSIS ✨

void trace_ipi_raise (const struct cpumask *mask , const char *reason );

like, that's the whole signature. copy it exactly, don't be weird about the spacing. 💅

🎀 ARGUMENTS 🎀

• mask — the mask of recipient CPUs for the IPI. it's literally telling you who is getting pinged. 👑
• reason — a string identifying the IPI purpose. it's the "why tho" of the whole thing. 🫶

💖 DESCRIPTION 💖

here's the important bit, and ngl it's a real one: it is necessary for reason to be a static string declared with __tracepoint_string. 🔥

not me stressing this — it's necessary, okay? not "nice to have", not "if you feel like it". static string, declared with __tracepoint_string. that's the rule, periodt. 💀

🌈 SEE ALSO 🌈

• Kernel file ./include/trace/events/ipi.h — trace_ipi_entry(9), trace_ipi_exit(9) — go read the siblings, they're iconic too. ⭐

and that's the page, bestie! 🧚 source is ./include/trace/events, version dated October 2026, and the page signs off as trace_ipi_raise(9) — slay, no cap. 💜🌸