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Date: Thu,  8 Feb 2024 23:56:08 +0100
From: Valentin Obst <kernel@...entinobst.de>
To: aliceryhl@...gle.com
Cc: a.hindborg@...sung.com,
	akpm@...ux-foundation.org,
	alex.gaynor@...il.com,
	arnd@...db.de,
	arve@...roid.com,
	benno.lossin@...ton.me,
	bjorn3_gh@...tonmail.com,
	boqun.feng@...il.com,
	brauner@...nel.org,
	cmllamas@...gle.com,
	gary@...yguo.net,
	gregkh@...uxfoundation.org,
	joel@...lfernandes.org,
	keescook@...omium.org,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	maco@...roid.com,
	ojeda@...nel.org,
	rust-for-linux@...r.kernel.org,
	surenb@...gle.com,
	tkjos@...roid.com,
	viro@...iv.linux.org.uk,
	wedsonaf@...il.com,
	Valentin Obst <kernel@...entinobst.de>
Subject: Re: [PATCH v2 2/4] uaccess: always export _copy_[from|to]_user with CONFIG_RUST

> -#else
>  extern __must_check unsigned long
>  _copy_from_user(void *, const void __user *, unsigned long);
> -#endif

This function is now unconditionally declared, but only defined if
`!defined(INLINE_COPY_FROM_USER) || defined(CONFIG_RUST)`, i.e., in the
common case where it is inlined and Rust is disabled this can lead to
link-time problems if someone decides to use it.

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