panic_smp_redirect_cpu(9)

💅 panic_smp_redirect_cpu(9) — the kernel API manual, bestie edition ✨

okay so this is a page from the Kernel API Manual (panic_smp_redirect_cpu(9), iykyk) and honestly? it's short, it's iconic, let's get into it 🫶

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🎀 NAME 🎀

panic_smp_redirect_cpu — literally redirects a panic to a target CPU 🌸

✨ SYNOPSIS ✨

int panic_smp_redirect_cpu (int target_cpu , void *msg );

that's the whole signature, no cap. two args, one int coming back at you 💫

🦋 ARGUMENTS 🦋

• target_cpu — the CPU that should handle the panic 👑 like, this is the main character that gets to deal with it
• msg — the formatted panic message 🥲 the whole dramatic text of it

💖 DESCRIPTION 💖

so the default implementation uses IPI. that's the vibe it ships with, periodt.

but listen — architectures with NMI support can override this for more reliable delivery 🔥 (yes, "more reliable" is doing a lot of heavy lifting there, and we respect it)

🌈 RETURN 🌈

• 0 on success ✨ slay
• negative errno on failure 😭 it's giving "went wrong"

👑 SEE ALSO 👑

• Kernel file ./kernel/panic.c
• panic_try_force_cpu(9)
• vpanic(9)
• print_tainted(9)
• print_tainted_verbose(9)
• add_taint(9)

go read those too, fr fr 📚

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ngl this page is tiny but it's still important — remember the default is IPI, and the NMI override is the glow-up some architectures get 💅

⭐ ok bye bestie, this page lived in ./kernel and was dated October 2026 — that's the source and the date, mentioned cute-style, and we're done here 🎀💜