stack_map_c...te_max_depth(9)

💅 stack_map_calculate_max_depth(9) — from the Kernel API Manual, bestie 🎀

okay so picture this: you're deep in kernel/bpf, you've got a stack trace, and you need to know exactly how many entries you can cram in there before things get weird. That's literally this function's whole personality. It calculates the maximum allowed stack trace depth, and it does it flawlessly. no notes. ✨

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🌸 NAME 🌸

stack_map_calculate_max_depth — calculate maximum allowed stack trace depth. that's it, that's the job, and she ate 💅

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✨ SYNOPSIS ✨

u32 stack_map_calculate_max_depth (u32 size , u32 elem_size , u64 flags );

look at her. four params, one u32 return, zero drama. 🦋

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🎀 ARGUMENTS 🎀

• size — the size of the buffer / map value, in bytes. she needs to know how much room we're working with, periodt.
• elem_size — the size of each individual stack trace element. one entry, one lil unit, you get it 💖
• flags — the BPF stack trace flags, like BPF_F_USER_STACK, BPF_F_USER_BUILD_ID, ... — yes bestie, there are more, the manpage literally says ... so don't come for me 🙈

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🔥 RETURN 🔥

the maximum number of stack trace entries that can be safely stored. safely is doing so much work in that sentence and I respect it — this is your ceiling, your limit, your whole vibe check for how deep you're allowed to go. no cap. 👑

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🦋 SEE ALSO 🦋

• the kernel file ./kernel/bpf/stackmap.c — that's the main character right there, go read her 🌈

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lowkey important: if you're out here stuffing more entries than this number into your stack map, that's not slaying, that's not safe. respect the return value fr fr 😭

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and that's the whole page, bestie 🫶 — straight from ./kernel/bpf, dated October 2026, brought to you with love and a lil sparkle ⭐🧚💜