copy_to_iter_fromio(9)

💅 copy_to_iter_fromio

okay bestie so this is a page from the Kernel API Manual (yes, the real one, we're in the kernel docs era now 🎀) and it's about a little function called copy_to_iter_fromio — and honestly? it's giving "small function, important job." 🦋

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✨ NAME ✨

copy_to_iter_fromio — copy data from mmio-space to iov_iter 💫

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🌸 SYNOPSIS 🌸

size_t copy_to_iter_fromio (const void __iomem *src , size_t count ,
       struct iov_iter *dst );

literally the whole signature, no notes 💅

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🎀 ARGUMENTS 🎀

• src — the source pointer, and she lives in mmio-space 🏠 (yes, that matters, that's the whole vibe of this function)
• count — the data size to copy, in bytes 🧮 like how much we're moving
• dst — the destination iov_iter 🎯 that's where everything lands

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💖 DESCRIPTION 💖

Copies the data from mmio-space to iov_iter. that's it, that's the tea ☕ it does one thing and it does it well, and honestly we respect the focus 👑

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⭐ RETURN ⭐

number of bytes to be copied 🔢

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🔥 SEE ALSO 🔥

• copy_to_user_fromio(9)
• copy_from_user_toio(9)
• copy_from_iter_toio(9)
• and the kernel file ./sound/core/memory.c if you wanna go read the source, iykyk 📖

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ngl bestie, the _fromio / _toio naming family is a whole squad — don't mix up which direction you're going or it's gonna be a whole situation 😭

and that's the page, periodt ✨

<div align="center">— xoxo, from ./sound/core, dated October 2026, still out here being copy_to_iter_fromio(9) 🫶💜</div>