rol64(9)

🌸 rol64 — the Kernel API Manual situation 🌸

okay bestie, welcome to rol64(9), the tiny little legend tucked inside the Kernel API Manual ✨ she's small, she's specific, and honestly? she ate.

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✨ NAME ✨

rol64 — rotate a 64-bit value left 💅 lowkey that's the whole personality and honestly it's enough

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🦋 SYNOPSIS 🦋

here's the vibe check, copy it exactly okurr:

__u64 rol64 (__u64 word , unsigned int shift );

like, that's her. that's the signature. no notes. 🔥

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🎀 ARGUMENTS 🎀

• word — the value to rotate, bestie. this is the main character of the whole operation 👑
• shift — the bits to roll 🌀 that's it, that's the assignment

not me having only two arguments to explain 😭 she's efficient, she's unbothered, she's iconic fr fr

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💖 SEE ALSO 💖

okay so there's a whole friend group and you're gonna want to know all of them, no cap:

the kernel file is ./include/linux/bitops.h and she rolls with:

• ror64(9)
• rol32(9)
• ror32(9)
• rol16(9)
• ror16(9)
• rol8(9)
• ror8(9)
• sign_extend32(9)
• sign_extend64(9)
• get_count_order_long(9)
• parity8(9)
• __ffs64(9)
• fns(9)
• assign_bit(9)
• __ptr_set_bit(9)
• __ptr_clear_bit(9)
• __ptr_test_bit(9)

like that's a whole squad and every single one of them is named exactly like that, don't @ me 🫶

💀 reminder: I'm being cute but the names above are literal — type them exactly as written, bestie, iykyk.

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and that's the page, periodt. this lil gem lives in ./include/linux, dated October 2026, and it's giving "small file, big energy" 🌈🦋 stay rotating, queen 💜