const_ilog2(9)

💅 const_ilog2(9) — bestie edition 💅

okay so welcome to the Kernel API Manual page for const_ilog2(9), aka the little log-base-2 constant queen. No cap, she's here for that constant-expression energy. ✨

🌸 NAME 🌸

const_ilog2 — log base 2 of 32-bit or a 64-bit constant unsigned value. That's the whole name, and she ate. 💖

🎀 SYNOPSIS 🎀

const_ilog2 (n );

🦋 ARGUMENTS 🦋

• n — parameter. Yep, that's the entire argument description, bestie; the manpage is keeping it mysterious. 🙈

⭐ DESCRIPTION ⭐

Use this where sparse expects a true constant expression, e.g. for array indices. That's the vibe: constant expression zone, and the exact use case the page gives us is array indices. periodt.

🔥 SEE ALSO 🔥

• Kernel file ./include/linux/log2.h
• is_power_of_2(9)
• __roundup_pow_of_two(9)
• __rounddown_pow_of_two(9)
• ilog2(9)
• roundup_pow_of_two(9)
• rounddown_pow_of_two(9)
• order_base_2(9)
• bits_per(9)
• max_pow_of_two_factor(9)

cute sign-off time 🫶 this page's source/version is ./include/linux, the date on it is October 2026, and the manpage header is of course const_ilog2(9). bye bestie, go be iconic with your constants 💜