REPEAT_BYTE(9)

💅 REPEAT_BYTE(9) — like, the Kernel API Manual page, bestie 🎀

okayyy so welcome to the Kernel API Manual ✨ today we're talking about REPEAT_BYTE, and honestly? she's a little icon. 🫶

🌸 NAME 🌸

REPEAT_BYTE — repeats the value @x multiple times as an unsigned long value. that's it. that's the whole gig. and she does it flawlessly 💅

✨ SYNOPSIS ✨

REPEAT_BYTE (x );

yes the spacing is doing its own thing, don't @ me, it's literally what's written 😭

🦋 ARGUMENTS 🦋

• x — the value you want to repeat. that's the one. the main character of this whole operation 👑

💀 NOTE 💀

okay so this is the important part, bestie, listen up 🚨

x is not checked for > 0xff, and larger values produce odd results. like, nobody's running a vibe check on your input here. fr fr. so if you hand it something thicc like 0x1ff, the output gets weird and nobody's stopping you 🙈

not me warning you that this is unchecked — it lowkey is, so pls be careful with your byte-sized assumptions 🍓

🌈 SEE ALSO 🌈

y'all should also go look at these, they're all in the same friend group 🧚

• Kernel file: ./tools/testing/selftests/powerpc/primitives/linux/wordpart.h
• upper_32_bits(9)
• lower_32_bits(9)
• upper_16_bits(9)
• lower_16_bits(9)
• REPEAT_BYTE_U32(9)

---

and that's the whole page, no cap 💖

source/version: ./tools/testing/selftests/powe... — October 2026 — mwah, thanks for reading, slay ⭐👑