__kcsan_check_read(9)

💅 __kcsan_check_read (9) — Kernel API Manual, but make it make sense

okay so bestie, welcome to the Kernel API Manual, section 9, where we talk about __kcsan_check_read. it's short, it's sweet, it's giving "tiny but crucial", and i'm obsessed. let's get into it ✨

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🌸 NAME 🌸

__kcsan_check_read — check regular read access for races. that's it. that's the whole vibe check. it peeks at a read and goes "hmm, is this a race? 👀"

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🎀 SYNOPSIS 🎀

__kcsan_check_read (ptr , size );

yes, the spacing is exactly like that, don't @ me, i don't make the rules (i literally do not make the rules, i just copy them exactly 💀)

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🦋 ARGUMENTS 🦋

• ptr — address of access. this is the "where" of it all, the main character of this function honestly.
• size — size of access. how much of ptr we're looking at. the "how much" energy. the range, if you will 🫶

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🌈 SEE ALSO 🌈

bestie there are SO many siblings, it's a whole family reunion, buckle up:

• __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_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)

and the kernel file that started it all: ./include/linux/kcsan-checks.h — literally the mothership, iykyk 💜

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okay that's the whole page and honestly? iconic. no notes. this came from the kernel source tree at ./include/linux, dated October 2026, and it's still filed under __kcsan_check_read(9). slay, go check those reads, mwah 🧚💖