generic___fls(9)

🦋 NAME 🦋

okay bestie, meet generic___fls(9) from the Kernel API Manual 💖 — it finds the last (most-significant) set bit in a long word. iconic little bit-hunter behavior, ngl.

✨ SYNOPSIS ✨

unsigned int generic___fls (unsigned long word );

lowkey that's the whole signature. no cap.

🌸 ARGUMENTS 🌸

• word — the word to search. that's the long word you're handing over for the vibe check 🔍

💅 DESCRIPTION 💅

so bestie, this is undefined if no set bit exists 😭 — like, no set bit at all means we're in undefined-behavior territory. so your code should check against 0 first, fr fr. that's the whole safety memo.

🎀 SEE ALSO 🎀

• Kernel file ./tools/include/asm-generic/bitops/__fls.h — go read the source, bestie, it's giving lore 👀

mwah 💖 — signing off with the footer tea: Kernel API Manual source/version vibes from ./tools/include/asm-generic/bi..., dated October 2026, with generic___fls(9) on the right, living its best life. 🫶✨