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From: Atharv Dubey <atharvd440@gmail.com>
To: arnd@arndb.de, gregkh@linuxfoundation.org
Cc: ojeda@kernel.org, alex.gaynor@gmail.com, boqun.feng@gmail.com,
	gary@garyguo.net, bjorn3_gh@protonmail.com, lossin@kernel.org,
	a.hindborg@kernel.org, aliceryhl@google.com, tmgross@umich.edu,
	dakr@kernel.org, rust-for-linux@vger.kernel.org,
	linux-kernel@vger.kernel.org, Atharv Dubey <atharvd440@gmail.com>
Subject: [PATCH] rust: miscdevice: use `pin_init::zeroed()` for C type initialization
Date: Fri, 28 Nov 2025 21:53:37 +0530	[thread overview]
Message-ID: <20251128162337.12082-1-atharvd440@gmail.com> (raw)

Replace manual zero-initialization using
`MaybeUninit::zeroed().assume_init()` with `pin_init::zeroed()`.
The `pin_init` helper provides a safer and clearer API for
zero-initializing C structs without requiring an `unsafe` block.

Link: https://github.com/Rust-for-Linux/linux/issues/1189
Signed-off-by: Atharv Dubey <atharvd440@gmail.com>
---
 rust/kernel/miscdevice.rs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/rust/kernel/miscdevice.rs b/rust/kernel/miscdevice.rs
index d698cddcb4a5..e168e9da8f4a 100644
--- a/rust/kernel/miscdevice.rs
+++ b/rust/kernel/miscdevice.rs
@@ -20,7 +20,7 @@
     seq_file::SeqFile,
     types::{ForeignOwnable, Opaque},
 };
-use core::{marker::PhantomData, mem::MaybeUninit, pin::Pin};
+use core::{marker::PhantomData, pin::Pin};
 
 /// Options for creating a misc device.
 #[derive(Copy, Clone)]
@@ -33,7 +33,7 @@ impl MiscDeviceOptions {
     /// Create a raw `struct miscdev` ready for registration.
     pub const fn into_raw<T: MiscDevice>(self) -> bindings::miscdevice {
         // SAFETY: All zeros is valid for this C type.
-        let mut result: bindings::miscdevice = unsafe { MaybeUninit::zeroed().assume_init() };
+        let mut result: bindings::miscdevice = pin_init::zeroed();
         result.minor = bindings::MISC_DYNAMIC_MINOR as ffi::c_int;
         result.name = crate::str::as_char_ptr_in_const_context(self.name);
         result.fops = MiscdeviceVTable::<T>::build();
@@ -421,7 +421,7 @@ impl<T: MiscDevice> MiscdeviceVTable<T> {
             None
         },
         // SAFETY: All zeros is a valid value for `bindings::file_operations`.
-        ..unsafe { MaybeUninit::zeroed().assume_init() }
+        ..pin_init::zeroed()
     };
 
     const fn build() -> &'static bindings::file_operations {
-- 
2.43.0


             reply	other threads:[~2025-11-28 16:23 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-11-28 16:23 Atharv Dubey [this message]
2025-11-28 19:08 ` [PATCH] rust: miscdevice: use `pin_init::zeroed()` for C type initialization Miguel Ojeda
2025-11-29  6:46 ` Dirk Behme
2025-11-29 16:33   ` Miguel Ojeda
2025-12-01 14:24     ` Atharv Dubey

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