hw_breakpoint_slot_setup(9)

🌸 hw_breakpoint_slot_setup(9) — the Kernel API Manual, bestie edition 🎀

okay so this one lives in the Kernel API Manual (iykyk) and it's literally about finding a perf slot and setting it up based on whatever ops you hand it. lowkey iconic behaviour from arm64. let's get into it 💅

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✨ NAME ✨

hw_breakpoint_slot_setup — find and set up a perf slot according to the operations you want. that's the whole vibe 🦋

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🫶 SYNOPSIS 🫶

int hw_breakpoint_slot_setup (struct perf_event **slots , int max_slots
, struct perf_event *bp , enum hw_breakpoint_ops ops );

she returns an int, she takes four arguments, and yes the spacing is exactly like that, don't come for me 😭

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💖 ARGUMENTS 💖

• slots — pointer to the array of slots. the whole lineup 👑
• max_slots — the max number of slots. know your limits bestie ✨
• bp — the perf_event that's about to get set up. main character energy fr 🌟
• ops — the operation that's going to be carried out on the slot. tell her what to do 💅

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🌈 RETURN 🌈

• the slot index on success — slay, you got a slot 💖
• -ENOSPC if there's no slot available or no slot matches — literally no space, crying 😭
• -EINVAL if the operations parameter is wrong — not the right ops, invalid, we don't do that here 🙈

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🧚 SEE ALSO 🧚

• Kernel file ./arch/arm64/kernel/hw_breakpoint.c — go read the source if you want the full lore, it's giving deep cuts ⭐

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ngl the return values are the whole story here: index = good, -ENOSPC = no room at the inn, -EINVAL = you passed something cursed. no cap 🫶

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and that's the whole page, bestie 🍓 this lil gem came out of ./arch/arm64/kernel in October 2026 — mwah, go touch some slots 💜✨