generic_fls(9)

📦 version 7.3.1, in nixpkgs unstable

✨ NAME ✨

okay so bestie, this is the Kernel API Manual page for generic_fls(9) — and it does exactly what it says on the tin: find last (most-significant) bit set. 💅

  • generic_fls — find last (most-significant) bit set

🦋 SYNOPSIS 🦋

int generic_fls (unsigned int x );

🎀 ARGUMENTS 🎀

  • x — the word to search. That’s the whole input, bestie. 🫶

💅 DESCRIPTION 💅

It’s defined the same way as ffs, no cap. Also note these little iconic values: fls(0) = 0, fls(1) = 1, and fls(0x80000000) = 32. Periodt. 🔥

🌈 SEE ALSO 🌈

  • Kernel file ./tools/include/asm-generic/bitops/fls.h — go read the source, iykyk. 👑

🫶 source/version: ./tools/include/asm-generic/bi... · date: October 2026 · signing off from generic_fls(9) 💖

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