arch_set_bit(9)

🌸 NAME 🌸

okay so bestie, this is arch_set_bit(9) from the Kernel API Manual, and it does exactly one iconic thing: atomically set a bit in memory. no cap. 💅

🛠️ SYNOPSIS 🛠️

void arch_set_bit (int nr , volatile unsigned long *addr );

🎀 ARGUMENTS 🎀

• nr — the bit to set. that's the assignment, bestie ✨
• addr — the address to start counting from. yes, you start counting from there 🫶

⚠️ NOTE ⚠️

real talk: on non x86 architectures, there are no guarantees that this function will not be reordered. so if you're writing portable code, make sure not to rely on its reordering guarantees. periodt. 🚨

Also, nr may be almost arbitrarily large — this function is not restricted to acting on a single-word quantity. it's giving flexible, lowkey unbothered, highkey powerful. 🌈

👀 SEE ALSO 👀

Kernel file ./arch/riscv/include/asm/bitops.h with these related besties:

• __ffs(9)
• __fls(9)
• ffs(9)
• fls(9)
• arch_test_and_set_bit(9)
• arch_test_and_clear_bit(9)
• arch_test_and_change_bit(9)
• arch_clear_bit(9)
• arch_change_bit(9)
• arch_test_and_set_bit_lock(9)
• arch_clear_bit_unlock(9)
• arch___clear_bit_unlock(9)

byeee bestie 💖 this page's source/version is ./arch/riscv/include/asm, dated October 2026 — mwah! 🎀