__get_unaligned_t(9)

✨ __get_unaligned_t(9) ✨

okay so bestie, grab your iced coffee 🍓 — this is a page from the Kernel API Manual and it's literally about reading an unaligned value out of memory. no cap, it's giving "tiny helper, big safety energy" 💅

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🦋 NAME 🦋

__get_unaligned_t — read an unaligned value from memory 🫶

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🌸 SYNOPSIS 🌸

__get_unaligned_t (type , ptr );

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🎀 ARGUMENTS 🎀

• type — the type you're loading from the pointer, like, the whole entire personality of the load 💖
• ptr — the pointer you're loading from. the source. the main character ✨

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💜 DESCRIPTION 💜

so the way this works is it uses memcpy to do an unaligned type-sized load, and that's on purpose — it's dodging the undefined behavior you'd get from approaches like type punning, which need -fno-strict-aliasing in order to be correct. like, no thank you, we're not doing that 🙈

since type may be const, it uses __unqual_scalar_typeof to map over to a non-const type — because you literally can't memcpy into a const type, that's just the rules, periodt 💀

and the __get_unaligned_ctrl_type gives __unqual_scalar_typeof the required expression rather than a type, and a pointer is used to avoid warnings about mixing the use of 0 and NULL. iykyk 🔥

last thing: the void* cast silences ubsan warnings. slay, honestly 👑

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🌈 SEE ALSO 🌈

• Kernel file ./tools/include/vdso/unaligned.h
• __put_unaligned_t(9) — the other half of the duo, go say hi 🦋

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and that's the whole vibe check, bestie — this page came from ./tools/include/vdso, dated October 2026, and it was iconic from start to finish 😭💖