find_nth_and_bit(9)

📦 version 7.3.1, in nixpkgs unstable

💖 find_nth_and_bit(9) 💖

okay so you opened the Kernel API Manual, and today’s main character is find_nth_and_bit — the bit-finding bestie with two memory regions and zero chill. 🦋✨

🌸 NAME 🌸

find_nth_and_bit — find N'th set bit in 2 memory regions

✨ SYNOPSIS ✨

unsigned long find_nth_and_bit (const unsigned long *addr1 , const
       unsigned long *addr2 , unsigned long size , unsigned long n );

🎀 ARGUMENTS 🎀

here’s the tea on the parameters, bestie:

  • addr1 — The 1st address to start the search at. 🫶
  • addr2 — The 2nd address to start the search at. 💅
  • size — The maximum number of bits to search. that’s the limit, periodt.
  • n — The number of set bit, which position is needed, counting from 0. yes bestie, 0 is where the counting starts. 👑

🦋 DESCRIPTION 🦋

Returns the bit number of the N'th set bit. If no such, returns >= size.

that’s it, that’s the vibe: you ask for the N'th set bit, and if there’s no such bit, you get a value >= size. no cap. 💀✨

👑 SEE ALSO 👑

Kernel file ./include/linux/find.h is the spot, and these besties are all linked:

mwah 💋 — signed off from ./include/linux, dated October 2026. slay, bestie 🎀💜

📦 where this page comes from