__kcsan_check_access(9)

💅 __kcsan_check_access (9) — Kernel API Manual, bestie edition 🎀

okay so real talk, this one lives in the Kernel API Manual and it's basically the vibe-check function for memory access. No cap.

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✨ NAME ✨

__kcsan_check_access — literally checks a generic access for races 🏁👀

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🌸 SYNOPSIS 🌸

void __kcsan_check_access (const volatile void *ptr , size_t size , int
type );

that's the whole signature, she's not complicated 💅

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🦋 ARGUMENTS 🦋

• ptr — the address of the access, like where the drama is happening 📍
• size — how big the access is, the size of it, that's it 🍓
• type — the access type modifier, she's the little flavor packet on top ✨

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👑 SEE ALSO 👑

so this all comes from the kernel file ./include/linux/kcsan-checks.h, and honestly the whole friend group is here — go say hi 🫶

• __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_atomic_next(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)

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bestie that's a lot of siblings but they're all iconic in their own way, periodt 💜

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sign-off time 🧚 this whole thing is filed under ./include/linux and stamped October 2026 — so like, future energy, main character documentation fr fr 💖✨