sign_extend32(9)

✨ sign_extend32 ✨

okay bestie so this is a page from the Kernel API Manual 💖 and it's literally about sign_extend32 — yes it's exactly as iconic as it sounds 🎀

🌸 NAME 🌸

sign_extend32 — sign extend a 32-bit value using specified bit as sign-bit 💅

🦋 SYNOPSIS 🦋

__s32 sign_extend32 (__u32 value , int index );

🍓 ARGUMENTS 🍓

• value — the value you want to sign extend, periodt ✨
• index — the 0 based bit index (0 <= index < 32) that you're treating as the sign bit 👑

🧚 DESCRIPTION 🧚

so like the whole point: this one is safe to use for 16- and 8-bit types as well 🫶 no cap, it just works.

⭐ RETURN ⭐

it gives you back a 32-bit sign extended value 💖 that's the whole moment.

🌈 SEE ALSO 🌈

Kernel file ./include/linux/bitops.h — and the whole friend group:

• rol64(9), ror64(9), rol32(9), ror32(9), rol16(9), ror16(9), rol8(9), ror8(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)

lowkey a whole squad of bit twiddlers, go say hi 💀

okay that's the page!! 🎀 from ./include/linux, dated October 2026, and it signs off as sign_extend32(9) — mwah, slay, bye bestie 💜🔥