roundup_pow_of_two(9)

💖 NAME 💖

Okay bestie, welcome to the Kernel API Manual — this one is roundup_pow_of_two(9), and it does exactly what the name says: roundup_pow_of_two rounds the given value up to nearest power of two, and @n is the parameter. 💅

✨ SYNOPSIS ✨

Like, this is literally the whole call:

roundup_pow_of_two (n );

🎀 ARGUMENTS 🎀

• n — the docs literally say -- undescribed --. That's it. That's the whole description, bestie. 😭

🦋 DESCRIPTION 🦋

Okay so the vibe is: round the given value up to the nearest power of two. It's giving math, but make it kernel. 🧚

• 🫶 the result is undefined when n == 0 — no cap, the page says undefined, so zero is genuinely not the moment.
• ⭐ this can be used to initialise global variables from constant data — yep, that's the documented use, periodt.

🌈 SEE ALSO 🌈

Kernel file ./tools/include/linux/log2.h, plus ilog2(9) and rounddown_pow_of_two(9) — go read those too, iykyk. 👑

mwah 💋 this cutie is from ./tools/include/linux, dated October 2026 — that’s the source/version and date, bestie. periodt. 💜