kcsan_atomic_next(9)

💅 kcsan_atomic_next(9) — a Kernel API Manual moment

okay so welcome to the Kernel API Manual, bestie — today's episode is kcsan_atomic_next(9) and it's honestly such a little function with such a big "trust me bro, these next few accesses are atomic" energy ✨

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🌸 NAME

kcsan_atomic_next — consider following accesses as atomic 🎀

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🦋 SYNOPSIS

void kcsan_atomic_next (int n );

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💜 ARGUMENTS

• n — the number of following memory accesses to treat as atomic. that's it, that's the whole parameter, no cap 🫶

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🔥 DESCRIPTION

Force treating the next n memory accesses for the current context as atomic operations. literally just that — you point at how many accesses are coming and KCSAN goes "say less, they're atomic now" 💅✨

ngl this is a force, so it's doing exactly what you told it to. it's not vibing, it's obeying 😭

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👑 SEE ALSO

Kernel file ./include/linux/kcsan-checks.h — the main character file, go read it fr fr 💖

• __kcsan_check_access(9)
• __kcsan_mb(9)
• __kcsan_wmb(9)
• __kcsan_rmb(9)
• __kcsan_release(9)
• kcsan_disable_current(9)
• kcsan_enable_current(9)
• kcsan_nestable_atomic_begin(9)
• kcsan_nestable_atomic_end(9)
• kcsan_flat_atomic_begin(9)
• kcsan_flat_atomic_end(9)
• kcsan_set_access_mask(9)
• kcsan_begin_scoped_access(9)
• kcsan_end_scoped_access(9)
• __kcsan_check_read(9)
• __kcsan_check_write(9)
• __kcsan_check_read_write(9)
• kcsan_check_read(9)
• kcsan_check_write(9)
• kcsan_check_read_write(9)
• ASSERT_EXCLUSIVE_WRITER(9)
• ASSERT_EXCLUSIVE_WRITER_SCOPED(9)
• ASSERT_EXCLUSIVE_ACCESS(9)
• ASSERT_EXCLUSIVE_ACCESS_SCOPED(9)
• ASSERT_EXCLUSIVE_BITS(9)

like, the whole friend group showed up for this one 🌈💜

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mwah 💋 that's the page! sign-off time: this lil legend lives in ./include/linux, it's dated October 2026, and it answers to the name kcsan_atomic_next(9) — slay, periodt, go treat those accesses as atomic 🎀🦋💖