mul_u64_u64_div_u64(9)

📦 version 7.3.1, in nixpkgs unstable

✨ mul_u64_u64_div_u64 ✨

okay so bestie, welcome to the Kernel API Manual, section 9 🎀 — this one's a little math baddie and she's honestly kind of iconic.

💖 NAME 💖

mul_u64_u64_div_u64 — unsigned 64bit multiply and divide 🔥 (yes, she does both, main character energy fr fr)

🦋 SYNOPSIS 🦋

mul_u64_u64_div_u64 (a , b , d );

🌸 ARGUMENTS 🌸

  • a — the first unsigned 64bit multiplicand 💅
  • b — the second unsigned 64bit multiplicand 💅
  • d — the unsigned 64bit divisor 👑

🌈 DESCRIPTION 🌈

So here's the vibe: you multiply two 64bit values together, which gives you a whole 128bit product (glow up ✨), and then you divide that by a third value. Big numbers, no cap.

Now the tea ☕ — the Generic code divides by 0 if d is zero, and returns ~0 on overflow. Bestie. Not the zero. 😭 And architecture specific code may trap on zero or overflow — so like, be careful, that's not a drill 💀.

⭐ RETURN ⭐

a * b / d

🫶 SEE ALSO 🫶

Kernel file ./include/linux/math64.h — go read her sisters, they're all slaying in the same family tree 🌳💜:

that's the whole page bestie, you ate that 🍓💖 mwah!

sign-off szn: brought to you straight out of ./include/linux, dated October 2026, and yes the page is literally called mul_u64_u64_div_u64(9) — she's that girl 👑🦋💜

📦 where this page comes from