linux-kernel - [PATCH v5 1/2] rust: alloc: add from

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Message-Id: <20250829071814.1973188-1-vitaly.wool@konsulko.se>
Date: Fri, 29 Aug 2025 09:18:14 +0200
From: Vitaly Wool <vitaly.wool@...sulko.se>
To: rust-for-linux@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	Uladzislau Rezki <urezki@...il.com>,
	Danilo Krummrich <dakr@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	"Liam R . Howlett" <Liam.Howlett@...cle.com>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Boqun Feng <boqun.feng@...il.com>,
	Gary Guo <gary@...yguo.net>,
	Bjorn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Trevor Gross <tmgross@...ch.edu>,
	Johannes Weiner <hannes@...xchg.org>,
	Yosry Ahmed <yosry.ahmed@...ux.dev>,
	Nhat Pham <nphamcs@...il.com>,
	linux-mm@...ck.org,
	Vitaly Wool <vitaly.wool@...sulko.se>
Subject: [PATCH v5 1/2] rust: alloc: add from_raw method to Flags

We need to be able to create Flags from its raw representation as u32
to properly map zpool C API into Rust. This patch adds from_raw method
to Flags and makes it crate private.

Signed-off-by: Vitaly Wool <vitaly.wool@...sulko.se>
---
 rust/kernel/alloc.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/rust/kernel/alloc.rs b/rust/kernel/alloc.rs
index b39c279236f5..0c839813a15d 100644
--- a/rust/kernel/alloc.rs
+++ b/rust/kernel/alloc.rs
@@ -41,6 +41,13 @@
 pub struct Flags(u32);
 
 impl Flags {
+    /// Create `Flags` from the raw representation.
+    ///
+    /// `f` must be a valid combination of GFP flags.
+    pub(crate) fn from_raw(f: u32) -> Self {
+        Self(f)
+    }
+
     /// Get the raw representation of this flag.
     pub(crate) fn as_raw(self) -> u32 {
         self.0
-- 
2.39.2