From: Greg KH <gregkh@linuxfoundation.org>
To: Viresh Kumar <viresh.kumar@linaro.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>,
"Miguel Ojeda" <miguel.ojeda.sandonis@gmail.com>,
"Danilo Krummrich" <dakr@redhat.com>,
"Miguel Ojeda" <ojeda@kernel.org>,
"Alex Gaynor" <alex.gaynor@gmail.com>,
"Boqun Feng" <boqun.feng@gmail.com>,
"Gary Guo" <gary@garyguo.net>,
"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
"Benno Lossin" <benno.lossin@proton.me>,
"Andreas Hindborg" <a.hindborg@kernel.org>,
"Alice Ryhl" <aliceryhl@google.com>,
"Trevor Gross" <tmgross@umich.edu>,
linux-pm@vger.kernel.org,
"Vincent Guittot" <vincent.guittot@linaro.org>,
"Stephen Boyd" <sboyd@kernel.org>, "Nishanth Menon" <nm@ti.com>,
rust-for-linux@vger.kernel.org,
"Manos Pitsidianakis" <manos.pitsidianakis@linaro.org>,
"Erik Schilling" <erik.schilling@linaro.org>,
"Alex Bennée" <alex.bennee@linaro.org>,
"Joakim Bech" <joakim.bech@linaro.org>,
"Rob Herring" <robh@kernel.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH V6 02/15] cpufreq: Add cpufreq_table_len()
Date: Wed, 8 Jan 2025 12:50:31 +0100 [thread overview]
Message-ID: <2025010855-cargo-quickness-a08f@gregkh> (raw)
In-Reply-To: <20250108111253.tg6ixurijf2dvptx@vireshk-i7>
On Wed, Jan 08, 2025 at 04:42:53PM +0530, Viresh Kumar wrote:
> On 07-01-25, 12:59, Greg KH wrote:
> > On Tue, Jan 07, 2025 at 04:51:35PM +0530, Viresh Kumar wrote:
> > > Add a function to calculate number of entries in the cpufreq table. This
> > > will be used by the Rust implementation.
> >
> > Again, why is Rust unique here? Why wouldn't the C code also need this?
>
> How about this:
>
> cpufreq: Add cpufreq_table_len()
>
> The last entry of a cpufreq table is marked by setting the frequency
> field to a special value: CPUFREQ_TABLE_END. The C code manages to
> traverse the table by checking the frequency field, until it reaches
> CPUFREQ_TABLE_END.
>
> The Rust cpufreq bindings though will need to know the length of the
> cpufreq table in advance, for example to check against an invalid index
> value.
>
> Provide a helper to calculate number of entries in the cpufreq table.
> will be used by the Rust implementation.
Odd, why can't Rust also know where CPUFREQ_TABLE_END is? Why do you
have to do extra work here? That feels wrong.
thanks,
greg k-h
next prev parent reply other threads:[~2025-01-08 11:50 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-01-07 11:21 [PATCH V6 00/15] Rust bindings for cpufreq and OPP core + sample driver Viresh Kumar
2025-01-07 11:21 ` [PATCH V6 01/15] PM / OPP: Expose refcounting helpers for the Rust implementation Viresh Kumar
2025-01-07 11:58 ` Greg KH
2025-01-08 9:11 ` Viresh Kumar
2025-01-08 11:53 ` Greg KH
2025-01-07 11:21 ` [PATCH V6 02/15] cpufreq: Add cpufreq_table_len() Viresh Kumar
2025-01-07 11:59 ` Greg KH
2025-01-08 11:12 ` Viresh Kumar
2025-01-08 11:50 ` Greg KH [this message]
2025-01-09 4:41 ` Viresh Kumar
2025-01-09 7:35 ` Greg KH
2025-01-13 7:30 ` Viresh Kumar
2025-01-13 7:53 ` Greg KH
2025-01-07 11:21 ` [PATCH V6 03/15] cpufreq: Rust implementation doesn't parse BIT() macro Viresh Kumar
2025-01-07 12:00 ` Greg KH
2025-01-07 13:29 ` Daniel Almeida
2025-01-08 6:53 ` Viresh Kumar
2025-01-08 9:01 ` Alice Ryhl
2025-01-08 9:27 ` Viresh Kumar
2025-01-08 5:37 ` Viresh Kumar
2025-01-08 14:47 ` Miguel Ojeda
2025-01-07 11:21 ` [PATCH V6 04/15] rust: device: Add few helpers Viresh Kumar
2025-01-07 11:56 ` Greg Kroah-Hartman
2025-01-08 11:02 ` Viresh Kumar
2025-01-08 11:52 ` Greg Kroah-Hartman
2025-01-08 11:55 ` Alice Ryhl
2025-01-08 12:14 ` Greg Kroah-Hartman
2025-01-08 13:42 ` Danilo Krummrich
2025-01-09 6:36 ` Viresh Kumar
2025-01-09 5:14 ` Viresh Kumar
2025-01-07 11:56 ` Danilo Krummrich
2025-01-07 11:21 ` [PATCH V6 05/15] rust: Add bindings for cpumask Viresh Kumar
2025-01-07 12:01 ` Greg KH
2025-01-07 11:21 ` [PATCH V6 06/15] rust: Add bare minimal bindings for clk framework Viresh Kumar
2025-01-07 11:21 ` [PATCH V6 07/15] rust: Add initial bindings for OPP framework Viresh Kumar
2025-01-07 11:21 ` [PATCH V6 08/15] rust: Extend OPP bindings for the OPP table Viresh Kumar
2025-01-07 11:21 ` [PATCH V6 09/15] rust: Extend OPP bindings for the configuration options Viresh Kumar
2025-01-07 11:21 ` [PATCH V6 10/15] rust: Add initial bindings for cpufreq framework Viresh Kumar
2025-01-07 11:21 ` [PATCH V6 11/15] rust: Extend cpufreq bindings for policy and driver ops Viresh Kumar
2025-01-07 11:21 ` [PATCH V6 12/15] rust: Extend cpufreq bindings for driver registration Viresh Kumar
2025-01-07 11:21 ` [PATCH V6 13/15] rust: Extend OPP bindings with CPU frequency table Viresh Kumar
2025-01-07 11:21 ` [PATCH V6 14/15] cpufreq: Add Rust based cpufreq-dt driver Viresh Kumar
2025-01-07 12:04 ` Greg KH
2025-01-07 11:21 ` [PATCH V6 15/15] DO-NOT_MERGE: cpufreq: Rename cpufreq-dt platdev Viresh Kumar
2025-01-07 11:47 ` [PATCH V6 00/15] Rust bindings for cpufreq and OPP core + sample driver Danilo Krummrich
2025-01-08 5:20 ` Viresh Kumar
2025-01-08 15:03 ` Miguel Ojeda
2025-01-09 3:50 ` Viresh Kumar
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