rounddown_pow_of_two(9)

💖 NAME 💖

rounddown_pow_of_two — round the given value down to nearest power of two.

@n — parameter.

Welcome to the Kernel API Manual glow-up for rounddown_pow_of_two(9), bestie 🎀✨

✨ SYNOPSIS ✨

rounddown_pow_of_two (n );

🌸 ARGUMENTS 🌸

• n — -- undescribed -- 🙈 (yes, the manpage really leaves it at that, no cap).

🦋 DESCRIPTION 🦋

okay so the vibe is: round the given value down to the nearest power of two ✨

• the result is undefined when n == 0 😭 — like, fr fr undefined, so don't be out here expecting a cute answer.
• this can be used to initialise global variables from constant data 👑 — iconic behaviour, honestly.

💅 SEE ALSO 💅

• Kernel file ./tools/include/linux/log2.h
• ilog2(9)
• roundup_pow_of_two(9)

🫶 final sign-off: source/version ./tools/include/linux, date October 2026, title rounddown_pow_of_two(9) — mwah! 💖✨