roundup_u64(9)

✨ roundup_u64(9) ✨

okay so bestie, we're in the Kernel API Manual today (section 9, the good stuff) and the star of the show is roundup_u64 — the glow-up your u64 didn't know it needed 💅

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🎀 NAME 🎀

roundup_u64 — Round up a 64bit value to the next specified 32bit multiple. literally that's her whole job and she ate 🔥

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🌸 SYNOPSIS 🌸

u64 roundup_u64 (u64 x , u32 y );

yes bestie that's the whole signature, no cap ✨

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🦋 ARGUMENTS 🦋

• x — the value to up 🌱 (yep, "to up", that's what it says, we love a noun that became a verb)
• y — the 32bit multiple to round up to 🎯

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💜 DESCRIPTION 💜

so here's the vibe: it rounds x to the next multiple of y. main character math, zero drama 💫

and if you're sitting there with a 32bit x like "hiii what about me", the page says: see roundup and the faster round_up for powers of 2 👑 — like, those are literally right there, iykyk.

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⭐ RETURN ⭐

the rounded up value 💖 (that's it, that's the return, she's an overachiever at exactly one thing and we respect it)

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🌈 SEE ALSO 🌈

bestie the whole friend group is in the Kernel file ./include/linux/math64.h — go say hi 🫶

• 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)
• DIV_U64_ROUND_UP(9)
• DIV64_U64_ROUND_CLOSEST(9)
• DIV_U64_ROUND_CLOSEST(9)
• DIV_S64_ROUND_CLOSEST(9)

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ok that's the whole page, no notes 📝 — go round something up and be iconic about it 🧚

sign-off szn: this one lives over at ./include/linux, dated October 2026 🍓 mwah, love u, bye 💜