sync_change_bit(9)

💫 sync_change_bit(9) 💫

okay bestie, welcome to the kernel API manual — this one's sync_change_bit, and it's lowkey iconic ✨

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🌸 NAME 🌸

sync_change_bit — flip a bit in memory, but make it atomic 💅

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🎀 SYNOPSIS 🎀

void sync_change_bit (long nr, volatile unsigned long *addr);

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🦋 ARGUMENTS 🦋

• nr — the bit you wanna change, bestie. that's the one getting toggled 🫶
• addr — the address where we start counting from ✨

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💖 DESCRIPTION 💖

so sync_change_bit is atomic and may not be reordered — no cap, that's the whole vibe check 🔥

also, real talk: nr can be almost arbitrarily large, so don't come in here thinking this function only works on a single-word quantity, bc it literally does not 😭 it's giving main character energy across the whole range, periodt 👑

ngl, "atomic and may not be reordered" is the kind of promise you do NOT wanna break — this is serious kernel business, so respect the guarantee 💀

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🌈 SEE ALSO 🌈

check the kernel file ./arch/x86/include/asm/sync_bitops.h for the whole squad:

• sync_set_bit(9)
• sync_clear_bit(9)
• sync_test_and_set_bit(9)
• sync_test_and_clear_bit(9)
• sync_test_and_change_bit(9)

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and that's the page, bestie 🧚💜 sign-off time: this one lives under ./arch/x86/include/asm, dated October 2026, and yeah — it slayed 🍓🌷 fingers crossed you never have to debug a reordered bit flip, mwah 💋⭐