kcsan_check_read(9)

💅 kcsan_check_read

okay so bestie, welcome to the Kernel API Manual — yes that's the manual we're in, we're doing kernel stuff today, put your hair up 🎀

This one's kcsan_check_read — she checks regular read access for races. That's the whole vibe. KCSAN's whole thing is spotting data races, and this little icon is you telling it "hey, I'm doing a normal (non-atomic) read right here, please keep an eye out for me" 👀✨

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🌸 SYNOPSIS

kcsan_check_read (ptr , size );

literally that's it, two args, no drama 💅

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✨ ARGUMENTS

• ptr — the address of the access. like, where you're reading from 🫶
• size — the size of the access. how many bytes you're grabbing, bestie 📏

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🦋 SEE ALSO

full squad, no cap — these all live in the kernel file ./include/linux/kcsan-checks.h:

• __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_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_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 I said. a whole squad 🌈👑

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ngl the read checks are genuinely iconic — they're how KCSAN knows what's a plain read versus all the fancy atomic/scoped stuff above. use her, she ate 💖

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okay that's the whole page bestie, go be a main character in your kernel 🧚

this one's served up from ./include/linux, dated October 2026 — mwah, catch you in the next manpage 💋🫶🌟