put_user_inline(9)

💖 put_user_inline(9) 💖

okay so bestie, welcome to the put_user_inline page — that's the inlined "write to user memory" helper from the Kernel API Manual. yes, the whole manual, just for this. we love a dedicated era. 🎀

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✨ NAME ✨

put_user_inline — Write to user memory inlined

🌸 SYNOPSIS 🌸

put_user_inline (val , udst );

🦋 ARGUMENTS 🦋

• val — The value to write 👑 like, the actual thing you're yeeting into user space
• udst — Pointer to the user space memory to write to 🎯 that's your destination, the spot in user memory getting the goods

⭐ RETURN ⭐

• 0 — if successful 🎉 slay, it worked
• -EFAULT — when faulted 💀 it did not work, the memory said no

🔥 DESCRIPTION 🔥

This is the inlined variant of put_user. periodt.

⚠️ Only use when there is a demonstrable performance reason. fr fr — like, an actual, provable one. don't just do it for the vibe. the compiler inlining this everywhere is not a personality trait, bestie.

🌈 SEE ALSO 🌈

Kernel file ./include/linux/uaccess.h — and honestly the whole friend group:

• __copy_to_user_inatomic(9)
• probe_subpage_writeable(9)
• copy_struct_from_user(9)
• copy_struct_to_user(9)
• get_kernel_nofault(9)
• __scoped_user_access_begin(9)
• __scoped_user_access(9)
• scoped_user_read_access_size(9)
• scoped_user_read_access(9)
• scoped_user_write_access_size(9)
• scoped_user_write_access(9)
• scoped_user_rw_access_size(9)
• scoped_user_rw_access(9)
• get_user_inline(9)

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🫶 ok that's the page!! sourced from ./include/linux and dated October 2026 — mwah, go write to user memory responsibly, ily 💜✨