div64_u64(9)

💅 div64_u64(9)

okay so bestie, welcome to the Kernel API Manual — yes, the kernel has man pages, and yes, this one is about dividing a 64-bit number by another 64-bit number. glamorous? no. essential? absolutely. let's get into it ✨

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🌸 NAME

div64_u64 — unsigned 64bit divide with 64bit divisor

like, the whole personality of this function is "I divide a u64 by a u64 and I don't do signed math, tyvm" 🎀

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✨ SYNOPSIS

u64 div64_u64 (u64 dividend , u64 divisor );

that's it. that's the whole function. two args in, one u64 out. iconic behavior honestly 🫶

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🧚 ARGUMENTS

• dividend — unsigned 64bit dividend. this is the number getting chopped up, the main character of the operation 👑
• divisor — unsigned 64bit divisor. this is the number doing the chopping. the supporting role that lowkey runs the whole thing 🔥

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🌈 RETURN

dividend / divisor

fr fr, it just hands you back the quotient. no cap, no surprises, no extra credit 💀

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🦋 SEE ALSO

first up, the filing cabinet it lives in: Kernel file ./include/linux/math64.h

and then the whole friend group:

• div_u64_rem(9)
• div_s64_rem(9)
• div64_u64_rem(9)
• div64_s64_rem(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)
• DIV_U64_ROUND_UP(9)
• DIV64_U64_ROUND_CLOSEST(9)
• DIV_U64_ROUND_CLOSEST(9)
• DIV_S64_ROUND_CLOSEST(9)
• roundup_u64(9)

if you need remainders, signed variants, or rounding macros — they're all right there bestie, go say hi 💖

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ngl this one's a short page, but that's the vibe: one function, unsigned, 64 by 64, done. no drama, only division 🌸

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and that's a wrap!! this page shipped from ./include/linux back in October 2026, and it's literally titled div64_u64(9) — mwah, slay, go divide something 💅💜