linux-kernel - [PATCH 1/4] rust: ffi: reexport Zeroable and related items

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Message-ID: <20260126-zeroable-ffi-v1-1-0ef101d1ed85@google.com>
Date: Mon, 26 Jan 2026 13:05:14 +0000
From: Alice Ryhl <aliceryhl@...gle.com>
To: Miguel Ojeda <ojeda@...nel.org>, Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	"Björn Roy Baron" <bjorn3_gh@...tonmail.com>, Benno Lossin <lossin@...nel.org>, 
	Andreas Hindborg <a.hindborg@...nel.org>, Trevor Gross <tmgross@...ch.edu>, 
	Danilo Krummrich <dakr@...nel.org>, "Rafael J. Wysocki" <rafael@...nel.org>, 
	Viresh Kumar <viresh.kumar@...aro.org>, Igor Korotin <igor.korotin.linux@...il.com>, 
	Daniel Almeida <daniel.almeida@...labora.com>, Len Brown <lenb@...nel.org>
Cc: rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-pm@...r.kernel.org, linux-acpi@...r.kernel.org, 
	Alice Ryhl <aliceryhl@...gle.com>
Subject: [PATCH 1/4] rust: ffi: reexport Zeroable and related items

To implement FromBytes/AsBytes for bindings types, we need to move these
traits to the ffi crate. For consistency, this means that Zeroable
should also be available from the ffi crate. Thus, add the appropriate
re-exports.

Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>
---
 rust/Makefile | 9 ++++++---
 rust/ffi.rs   | 7 +++++++
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/rust/Makefile b/rust/Makefile
index 5d357dce1704d15e43effc528be8f5a4d74d3d8d..701d64c2310858aca8f7f76d698549fa014f62bf 100644
--- a/rust/Makefile
+++ b/rust/Makefile
@@ -207,7 +207,8 @@ rustdoc-compiler_builtins: $(src)/compiler_builtins.rs rustdoc-core FORCE
 	+$(call if_changed,rustdoc)
 
 rustdoc-ffi: private is-kernel-object := y
-rustdoc-ffi: $(src)/ffi.rs rustdoc-core FORCE
+rustdoc-ffi: private rustc_target_flags = --extern pin_init
+rustdoc-ffi: $(src)/ffi.rs rustdoc-pin_init rustdoc-core FORCE
 	+$(call if_changed,rustdoc)
 
 rustdoc-pin_init_internal: private rustdoc_host = yes
@@ -249,7 +250,8 @@ quiet_cmd_rustc_test_library = $(RUSTC_OR_CLIPPY_QUIET) TL $<
 rusttestlib-build_error: $(src)/build_error.rs FORCE
 	+$(call if_changed,rustc_test_library)
 
-rusttestlib-ffi: $(src)/ffi.rs FORCE
+rusttestlib-ffi: private rustc_target_flags = --extern pin_init
+rusttestlib-ffi: $(src)/ffi.rs rusttestlib-pin_init FORCE
 	+$(call if_changed,rustc_test_library)
 
 rusttestlib-proc_macro2: private rustc_target_flags = $(proc_macro2-flags)
@@ -657,7 +659,8 @@ $(obj)/build_error.o: $(src)/build_error.rs $(obj)/compiler_builtins.o FORCE
 	+$(call if_changed_rule,rustc_library)
 
 $(obj)/ffi.o: private skip_gendwarfksyms = 1
-$(obj)/ffi.o: $(src)/ffi.rs $(obj)/compiler_builtins.o FORCE
+$(obj)/ffi.o: private rustc_target_flags = --extern pin_init
+$(obj)/ffi.o: $(src)/ffi.rs $(obj)/compiler_builtins.o $(obj)/pin_init.o FORCE
 	+$(call if_changed_rule,rustc_library)
 
 $(obj)/bindings.o: private rustc_target_flags = --extern ffi --extern pin_init
diff --git a/rust/ffi.rs b/rust/ffi.rs
index f961e9728f590fd2c52d4c03a1f715d654051d04..7218d4c535cbd7163d9aca52b0525c588a394d1b 100644
--- a/rust/ffi.rs
+++ b/rust/ffi.rs
@@ -48,3 +48,10 @@ macro_rules! alias {
 pub use core::ffi::c_void;
 
 pub use core::ffi::CStr;
+
+pub use pin_init::{
+    zeroed,
+    MaybeZeroable,
+    Zeroable,
+    ZeroableOption, //
+};

-- 
2.52.0.457.g6b5491de43-goog