ARRAY_ELEM_PTR(9)

💅 ARRAY_ELEM_PTR 💅

okay so bestie, welcome to the Kernel API Manual, section 9 — this one's called ARRAY_ELEM_PTR and honestly? it's giving "quietly iconic helper macro" energy. it's the glow-up version of pointer-verifying that actually knows how big your array really is. let's get into it 🎀

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✨ NAME ✨

ARRAY_ELEM_PTR — Obtain the verified pointer to an array element 🫶

like fr, it hands you back a pointer that's been verified, no cap.

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🦋 SYNOPSIS 🦋

ARRAY_ELEM_PTR (arr , i , n );

that's the whole vibe. three args, one macro, zero drama ✨

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🌸 ARGUMENTS 🌸

• arr — the array you're indexing into. your main character array, if you will 👑
• i — the array index. which element are we sliding into 💅
• n — the number of elements in the array. explicit. on purpose. we'll get to why 😌

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💖 DESCRIPTION 💖

so here's the tea ☕ — it's Similar to MEMBER_VPTR but it's intended for use with arrays where the element count needs to be explicit.

why does that matter, you ask? 🥺 because it can be used in cases where a global array is defined with an initial size but is intended to be be resized before loading the BPF program. and here's the part where it gets messy, bestie — Without this version of the macro, MEMBER_VPTR will use the compile time size of the array to compute the max, which will result in rejection by the verifier 💀💀💀

literally the verifier said "no ❤️" because the compile-time size wasn't the truth. so we pass n in ourselves and everyone stays unbothered. slay 🧚

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🔥 SEE ALSO 🔥

hiii go read these next, they're all besties:

• Kernel file ./tools/sched_ext/include/scx/common.bpf.h ⭐
• RESIZABLE_ARRAY(9)
• MEMBER_VPTR(9)
• __sink(9)
• time_delta(9)
• time_after(9)
• time_before(9)
• time_after_eq(9)
• time_before_eq(9)
• time_in_range(9)
• time_in_range_open(9)

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🌈 mwah, that's the whole page! this iconic lil manual page lives at ./tools/sched_ext/include/scx and it's dated October 2026 — so yes, it's from the future, and it ate 💅✨ 🎀