div_s64(9)

✨ div_s64 — signed 64bit divide with 32bit divisor 💅

okay so bestie, welcome to the div_s64(9) page, straight out of the Kernel API Manual 🎀. this one is short and sweet and honestly iconic for it — it's a little math baddie that does one job and does it flawlessly.

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🌸 SYNOPSIS 🌸

s64 div_s64 (s64 dividend , s32 divisor );

like, look at her. two args, one return, no drama. main character energy fr fr ✨

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🦋 ARGUMENTS 🦋

• dividend — the signed 64bit dividend 🍓, aka the number getting chopped up. it's an s64, so she's big and she can go negative, we love a range queen.
• divisor — the signed 32bit divisor 💜, aka the number doing the chopping. tiny but mighty, an s32, signed and everything.

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🌈 RETURN 🌈

the function hands you back dividend / divisor — that's it, that's the whole vibe. the quotient, served fresh, no cap 💅

ngl bestie, this page does not spell out what happens if divisor is 0. the docs stay silent, so don't come for me — just know the manpage makes zero promises there 🙈

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👑 SEE ALSO 👑

okay the friend group is huge and they're all in the kernel file ./include/linux/math64.h — go say hi to the whole crew:

• 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)
• 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)

literally the whole math64 extended universe, iykyk 🧚💖

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that's the page!! mwah, go divide something signed 🫶

this one came to you from the source ./include/linux, dated October 2026 — periodt, end of page, stan the kernel docs ⭐🔥