rust: make pin-init its own crate

Rename relative paths inside of the crate to still refer to the same
items, also rename paths inside of the kernel crate and adjust the build
system to build the crate.

[ Remove the `expect` (and thus the `lint_reasons` feature) since
  the tree now uses `quote!` from `rust/macros/export.rs`. Remove the
  `TokenStream` import removal, since it is now used as well.

  In addition, temporarily (i.e. just for this commit) use an `--extern
  force:alloc` to prevent an unknown `new_uninit` error in the `rustdoc`
  target. For context, please see a similar case in:

      https://lore.kernel.org/lkml/20240422090644.525520-1-ojeda@kernel.org/

  And adjusted the message above. - Miguel ]

Signed-off-by: Benno Lossin <benno.lossin@proton.me>
Reviewed-by: Fiona Behrens <me@kloenk.dev>
Tested-by: Andreas Hindborg <a.hindborg@kernel.org>
Link: https://lore.kernel.org/r/20250308110339.2997091-16-benno.lossin@proton.me
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

1 files changed, 0 insertions, 8 deletions

diff --git a/rust/macros/lib.rs b/rust/macros/lib.rs
index ba93dd686e38..f0f8c9232748 100644
--- a/rust/macros/lib.rs
+++ b/rust/macros/lib.rs
@@ -13,13 +13,7 @@ mod export;
 mod helpers;
 mod module;
 mod paste;
-#[path = "../pin-init/internal/src/pin_data.rs"]
-mod pin_data;
-#[path = "../pin-init/internal/src/pinned_drop.rs"]
-mod pinned_drop;
 mod vtable;
-#[path = "../pin-init/internal/src/zeroable.rs"]
-mod zeroable;
 
 use proc_macro::TokenStream;
 
@@ -398,5 +392,3 @@ pub fn paste(input: TokenStream) -> TokenStream {
     paste::expand(&mut tokens);
     tokens.into_iter().collect()
 }
-
-include!("../pin-init/internal/src/lib.rs");