do_div(9)

💅 do_div(9)

okay so bestie, welcome to the Kernel API Manual — this one's a lil macro from the kernel, do_div, and she's doing two things at once because she's a multitasking icon ✨

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🌸 NAME

do_div — returns 2 values: calculate remainder and update new dividend 🫶

like, she literally does both. no cap.

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🎀 SYNOPSIS

do_div (n , base );

that's it. that's the whole vibe check. 💅

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🦋 ARGUMENTS

• n — a uint64_t dividend — and heads up, she will be updated 🔥 (yes, the macro writes back into her, that's the whole point)
• base — a uint32_t divisor — the thing you're dividing by 🍓

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✨ DESCRIPTION

Summary, and I'm quoting the manpage's own summary here because it's already giving:

uint32_t remainder = n % base;
n = n / base;

so literally: grab the remainder from n % base, then overwrite n with n / base. two-for-one. ate and left no crumbs 👑

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💜 RETURN

(uint32_t)remainder — the remainder, cast to uint32_t, that's your comeback value 🌈

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💀 NOTE

⚠️ macro parameter n is evaluated multiple times — beware of side effects! 😭

fr fr, this is the important one. if you pass something with a side effect in it (like n++ or a function call), it's gonna fire off more than once and that's a situation. guard your vibes. 🫶

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🧚 SEE ALSO

Kernel file ./include/asm-generic/div64.h 👑 — go read the source, it's giving main character energy.

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kisses bestie, this page came to you from ./include/asm-generic, dated October 2026, and it's do_div(9) — slay, study up, and may all your remainders be correct 💖✨🎀