DIV_U64_ROUND_UP(9)

💖 DIV_U64_ROUND_UP 💖

okay so bestie, welcome to the DIV_U64_ROUND_UP(9) page from the Kernel API Manual — this one is a tiny little math situation and it is honestly iconic. Unsigned 64bit divide, 32bit divisor, but make it round up. 💅

🌸 NAME 🌸

DIV_U64_ROUND_UP — unsigned 64bit divide with 32bit divisor rounded up

🎀 SYNOPSIS 🎀

DIV_U64_ROUND_UP (ll , d );

that's the call, bestie — no cap.

🦋 ARGUMENTS 🦋

• ll — unsigned 64bit dividend. The big ol' number being divided.
• d — unsigned 32bit divisor. The 32bit number doing the dividing.

✨ DESCRIPTION ✨

Divide unsigned 64bit dividend by unsigned 32bit divisor and round up. Literally the whole plot: the division happens, the answer rounds up, main character energy only. 👑

💜 RETURN 💜

dividend / divisor rounded up. That's the returned value, periodt.

🔥 SEE ALSO 🔥

Kernel file ./include/linux/math64.h, plus this whole friend group:

• div_u64_rem(9)
• div_s64_rem(9)
• div64_u64_rem(9)
• div64_s64_rem(9)
• div64_u64(9)
• div64_s64(9)
• div_u64(9)
• div_s64(9)
• mul_u64_add_u64_div_u64(9)
• mul_u64_u64_div_u64(9)
• mul_u64_u64_div_u64_roundup(9)
• DIV64_U64_ROUND_UP(9)
• DIV64_U64_ROUND_CLOSEST(9)
• DIV_U64_ROUND_CLOSEST(9)
• DIV_S64_ROUND_CLOSEST(9)
• roundup_u64(9)

cute sign-off: this page is sourced from ./include/linux, dated October 2026, and the footer says DIV_U64_ROUND_UP(9). mwah 💋