linux-kernel - [PATCH] rust: cpufreq: streamline find_supply

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Message-ID: <20250915135954.2329723-2-thorsten.blum@linux.dev>
Date: Mon, 15 Sep 2025 15:59:54 +0200
From: Thorsten Blum <thorsten.blum@...ux.dev>
To: "Rafael J. Wysocki" <rafael@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	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>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Trevor Gross <tmgross@...ch.edu>,
	Danilo Krummrich <dakr@...nel.org>
Cc: Thorsten Blum <thorsten.blum@...ux.dev>,
	linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	rust-for-linux@...r.kernel.org
Subject: [PATCH] rust: cpufreq: streamline find_supply_names

Remove local variables from find_supply_names() and use .and_then() with
the more concise kernel::kvec![] macro, instead of KVec::with_capacity()
followed by .push() and Some().

No functional changes intended.

Signed-off-by: Thorsten Blum <thorsten.blum@...ux.dev>
---
 drivers/cpufreq/rcpufreq_dt.rs | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/cpufreq/rcpufreq_dt.rs b/drivers/cpufreq/rcpufreq_dt.rs
index 7e1fbf9a091f..224d063c7cec 100644
--- a/drivers/cpufreq/rcpufreq_dt.rs
+++ b/drivers/cpufreq/rcpufreq_dt.rs
@@ -28,15 +28,11 @@ fn find_supply_name_exact(dev: &Device, name: &str) -> Option<CString> {
 /// Finds supply name for the CPU from DT.
 fn find_supply_names(dev: &Device, cpu: cpu::CpuId) -> Option<KVec<CString>> {
     // Try "cpu0" for older DTs, fallback to "cpu".
-    let name = (cpu.as_u32() == 0)
+    (cpu.as_u32() == 0)
         .then(|| find_supply_name_exact(dev, "cpu0"))
         .flatten()
-        .or_else(|| find_supply_name_exact(dev, "cpu"))?;
-
-    let mut list = KVec::with_capacity(1, GFP_KERNEL).ok()?;
-    list.push(name, GFP_KERNEL).ok()?;
-
-    Some(list)
+        .or_else(|| find_supply_name_exact(dev, "cpu"))
+        .and_then(|name| kernel::kvec![name].ok())
 }
 
 /// Represents the cpufreq dt device.
-- 
2.51.0