div_u64(9)

📦 version 7.3.1, in nixpkgs unstable

💅 div_u64(9) — from the Kernel API Manual, bestie ✨

Okay so real talk, we're in the Kernel API Manual today and the vibe is math. Specifically 64-bit math with a 32-bit twist. Buckle up 🎀

✨ NAME ✨

div_u64 — unsigned 64bit divide with 32bit divisor 🦋

Like, you've got a big number, you've got a small number, and you want to know how many times the small one fits in the big one. That's it. That's the function. Slay.

🌸 SYNOPSIS 🌸

u64 div_u64 (u64 dividend , u32 divisor );

She takes two things and gives you back a u64. Iconic signature honestly 💅

🫶 ARGUMENTS 🫶

  • dividend — the unsigned 64bit dividend 💖 the big one, the main character, the number getting divided
  • divisor — the unsigned 32bit divisor ✨ the little one doing the dividing. Small but fierce.

🔥 DESCRIPTION 🔥

This is the most common 64bit divide and you should use it if possible, no cap. Because like… many 32bit archs can optimize this variant way better than a full 64bit divide 👑

So yeah, it's giving "use the right tool for the job." Don't make your poor 32bit arch do a whole 64bit divide when it doesn't have to 😭

⭐ RETURN ⭐

dividend / divisor

Literally just that. The quotient. Periodt 💀

🌈 SEE ALSO 🌈

Kernel file ./include/linux/math64.h — go read it, iykyk 📖

The whole math64 friend group, fr fr:

Every single one of them. The whole squad 🧚‍♀️

💜 And that's the page! Shoutout to ./include/linux, dated October 2026, for hosting all this math64 excellence. Go divide something responsibly bestie 🍓✨
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