arch_change_bit(9)

🎀 arch_change_bit(9) 🎀

Okay so this page is from the Kernel API Manual, and it's here to make a bit-toggling function make sense, bestie. No cap. 💖

✨ NAME ✨

arch_change_bit — toggle a bit in memory. That's the whole name, and it ate. 💅

🛠️ SYNOPSIS 🛠️

Here's the exact signature, keep it verbatim:

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

🧾 ARGUMENTS 🧾

Two arguments, bestie — both iconic:

• nr — bit to change. 🦋
• addr — address to start counting from. 🎀

📖 DESCRIPTION 📖

Big caveat first, fr fr: change_bit may be reordered on other architectures than x86. 🚨 So don't treat that reorder thing as a universal x86 vibe.

Also, note that nr may be almost arbitrarily large; this function is not restricted to acting on a single-word quantity. 🌸 So yeah, it's not just a one-word situation — that's the whole point, iykyk.

🌈 SEE ALSO 🌈

Kernel file ./arch/riscv/include/asm/bitops.h — go look, bestie. 👑

The whole function squad, in order:

• __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_set_bit(9)
• arch_clear_bit(9)
• arch_test_and_set_bit_lock(9)
• arch_clear_bit_unlock(9)
• arch___clear_bit_unlock(9)

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💖 And that's the tea: source/version ./arch/riscv/include/asm, dated October 2026, for arch_change_bit(9). Stay iconic, bestie! 💖