linux-kernel - [PATCH v2 11/13] rust: block: replace `core::mem::zeroed` with `pin

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Message-ID: <20250523145125.523275-12-lossin@kernel.org>
Date: Fri, 23 May 2025 16:51:07 +0200
From: Benno Lossin <lossin@...nel.org>
To: Andreas Hindborg <a.hindborg@...nel.org>,
	Boqun Feng <boqun.feng@...il.com>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <lossin@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Trevor Gross <tmgross@...ch.edu>,
	Danilo Krummrich <dakr@...nel.org>,
	Jens Axboe <axboe@...nel.dk>,
	Yutaro Ohno <yutaro.ono.418@...il.com>,
	Xizhe Yin <xizheyin@...il.nju.edu.cn>,
	Manas <manas18244@...td.ac.in>,
	Fiona Behrens <me@...enk.dev>
Cc: Lyude Paul <lyude@...hat.com>,
	linux-block@...r.kernel.org,
	rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 11/13] rust: block: replace `core::mem::zeroed` with `pin_init::zeroed`

All types in `bindings` implement `Zeroable` if they can, so use
`pin_init::zeroed` instead of relying on `unsafe` code.

If this ends up not compiling in the future, something in bindgen or on
the C side changed and is most likely incorrect.

Signed-off-by: Benno Lossin <lossin@...nel.org>
---
 rust/kernel/block/mq/gen_disk.rs | 3 +--
 rust/kernel/block/mq/tag_set.rs  | 4 +---
 2 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/rust/kernel/block/mq/gen_disk.rs b/rust/kernel/block/mq/gen_disk.rs
index cd54cd64ea88..75b90fe20c7d 100644
--- a/rust/kernel/block/mq/gen_disk.rs
+++ b/rust/kernel/block/mq/gen_disk.rs
@@ -93,8 +93,7 @@ pub fn build<T: Operations>(
         name: fmt::Arguments<'_>,
         tagset: Arc<TagSet<T>>,
     ) -> Result<GenDisk<T>> {
-        // SAFETY: `bindings::queue_limits` contain only fields that are valid when zeroed.
-        let mut lim: bindings::queue_limits = unsafe { core::mem::zeroed() };
+        let mut lim: bindings::queue_limits = pin_init::zeroed();
 
         lim.logical_block_size = self.logical_block_size;
         lim.physical_block_size = self.physical_block_size;
diff --git a/rust/kernel/block/mq/tag_set.rs b/rust/kernel/block/mq/tag_set.rs
index bcf4214ad149..44d4c8d800e9 100644
--- a/rust/kernel/block/mq/tag_set.rs
+++ b/rust/kernel/block/mq/tag_set.rs
@@ -38,9 +38,7 @@ pub fn new(
         num_tags: u32,
         num_maps: u32,
     ) -> impl PinInit<Self, error::Error> {
-        // SAFETY: `blk_mq_tag_set` only contains integers and pointers, which
-        // all are allowed to be 0.
-        let tag_set: bindings::blk_mq_tag_set = unsafe { core::mem::zeroed() };
+        let tag_set: bindings::blk_mq_tag_set = pin_init::zeroed();
         let tag_set = core::mem::size_of::<RequestDataWrapper>()
             .try_into()
             .map(|cmd_size| {
-- 
2.49.0