linux-kernel - Re: [PATCH V6 02/15] cpufreq: Add cpufreq_table

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Message-ID: <20250109044117.s5s4dlmssamwicew@vireshk-i7>
Date: Thu, 9 Jan 2025 10:11:17 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Greg KH <gregkh@...uxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>,
	Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
	Danilo Krummrich <dakr@...hat.com>, 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 <benno.lossin@...ton.me>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
	linux-pm@...r.kernel.org,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Stephen Boyd <sboyd@...nel.org>, Nishanth Menon <nm@...com>,
	rust-for-linux@...r.kernel.org,
	Manos Pitsidianakis <manos.pitsidianakis@...aro.org>,
	Erik Schilling <erik.schilling@...aro.org>,
	Alex Bennée <alex.bennee@...aro.org>,
	Joakim Bech <joakim.bech@...aro.org>, Rob Herring <robh@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V6 02/15] cpufreq: Add cpufreq_table_len()

On 08-01-25, 12:50, Greg KH wrote:
> Odd, why can't Rust also know where CPUFREQ_TABLE_END is?  Why do you
> have to do extra work here?  That feels wrong.

Well, it can, sure.

The freq table the Rust code receives is part of the C code:
bindings::cpufreq_frequency_table. Since it is a C managed pointer, I thought it
is better to do the parsing in C code itself. In case the implementation of the
struct changes in future (unlikely though), we would only need to fix the C code
and not Rust, which looks to be the right expectation.

-- 
viresh