ASSERT_EXCLU...CCESS_SCOPED(9)

✨ ASSERT_EXCLUSIVE_ACCESS_SCOPED(9) ✨

okay bestie, so this is a page straight out of the Kernel API Manual, section 9 — yes, the kernel one, the big scary one. but don't panic, this one's actually a little cutie 🎀 it's called ASSERT_EXCLUSIVE_ACCESS_SCOPED, and it's here to help you prove nobody's touching your variable while you're vibing in your scope. let's get into it 💅

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🌸 NAME 🌸

ASSERT_EXCLUSIVE_ACCESS_SCOPED — assert no concurrent accesses to @var in scope

like, literally, that's the whole gig. you're asserting that nobody else is accessing your variable for the whole scope. periodt. 👑

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🦋 SYNOPSIS 🦋

ASSERT_EXCLUSIVE_ACCESS_SCOPED (var );

that's it. that's the whole call. cute, right? 🫶

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⭐ ARGUMENTS ⭐

• var — the variable you're asserting on. your main character variable, if you will. this is the thing you're promising nobody else is touching. ✨

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💖 DESCRIPTION 💖

okay so this is the scoped variant of ASSERT_EXCLUSIVE_ACCESS — the glow-up version, if you will 💅

what it does: it asserts that there are no concurrent accesses to var — and that means no readers and no writers, not a single one — for the entire duration of the scope in which it's introduced. the whole scope. from start to finish. no sneaky little access slipping in halfway through. 🙈

and why is this iconic? because it's genuinely a better way to fully cover the enclosing scope, compared to stacking up multiple ASSERT_EXCLUSIVE_ACCESS calls like some kind of manual effort. one macro, whole scope covered. the way that it just handles the entire duration for you?? obsessed. 🔥

bonus: it increases the likelihood for KCSAN to detect racing accesses — so like, you're giving KCSAN a better shot at catching the racing accesses if they're being shady. kcsan said "not on my watch" 💀

ngl, the whole point here is coverage. if you sprinkle individual asserts you might miss a spot mid-scope. this one's got the scope's back the entire time. no cap. 🧚

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🌈 SEE ALSO 🌈

so many siblings, honestly, this macro has a huge family. here's the whole group chat 🫶

the file it lives in:

• Kernel file ./include/linux/kcsan-checks.h

the kcsan check crew:

• __kcsan_check_access(9)
• __kcsan_mb(9)
• __kcsan_wmb(9)
• __kcsan_rmb(9)
• __kcsan_release(9)

the enable/disable girlies:

• kcsan_disable_current(9)
• kcsan_enable_current(9)

the atomic pair squad:

• kcsan_nestable_atomic_begin(9)
• kcsan_nestable_atomic_end(9)
• kcsan_flat_atomic_begin(9)
• kcsan_flat_atomic_end(9)
• kcsan_atomic_next(9)

mask + scoped access besties:

• kcsan_set_access_mask(9)
• kcsan_begin_scoped_access(9)
• kcsan_end_scoped_access(9)

the check triad(s):

• __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)

the ASSERT_EXCLUSIVE fam:

• ASSERT_EXCLUSIVE_WRITER(9)
• ASSERT_EXCLUSIVE_WRITER_SCOPED(9)
• ASSERT_EXCLUSIVE_ACCESS(9)
• ASSERT_EXCLUSIVE_BITS(9)

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lowkey that's a lot of references but like... they're all doing related things, iykyk 💜

and that's the page!! this came from ./include/linux, dated October 2026, and we're out here in section 9 of the Kernel API Manual. go forth and scope your asserts, bestie — you're gonna slay it 🎀💖✨🦋