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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250929090524.ztcp6o6qndml54lm@vireshk-i7>
Date: Mon, 29 Sep 2025 14:35:24 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Thorsten Blum <thorsten.blum@...ux.dev>
Cc: "Rafael J. Wysocki" <rafael@...nel.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>, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org
Subject: Re: [PATCH] rust: cpufreq: streamline find_supply_names

On 15-09-25, 15:59, Thorsten Blum wrote:
> 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.

Applied. Thanks.

-- 
viresh