linux-kernel - Re: [PATCH v7 5/6] rust: pci: use pci::Vendor instead of bindings::PCI_VENDOR_ID

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Message-ID: <4b525afa-1031-4f99-a1ab-e89af77616eb@kernel.org>
Date: Thu, 28 Aug 2025 15:59:09 +0200
From: Danilo Krummrich <dakr@...nel.org>
To: Alexandre Courbot <acourbot@...dia.com>
Cc: John Hubbard <jhubbard@...dia.com>, Joel Fernandes
 <joelagnelf@...dia.com>, Timur Tabi <ttabi@...dia.com>,
 Alistair Popple <apopple@...dia.com>, David Airlie <airlied@...il.com>,
 Simona Vetter <simona@...ll.ch>, Bjorn Helgaas <bhelgaas@...gle.com>,
 Krzysztof Wilczyński <kwilczynski@...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>,
 nouveau@...ts.freedesktop.org, linux-pci@...r.kernel.org,
 rust-for-linux@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
 Elle Rhumsaa <elle@...thered-steel.dev>
Subject: Re: [PATCH v7 5/6] rust: pci: use pci::Vendor instead of
 bindings::PCI_VENDOR_ID_*

On 8/28/25 3:25 PM, Alexandre Courbot wrote:
> On Wed Aug 27, 2025 at 8:12 AM JST, John Hubbard wrote:
> <snip>
>> diff --git a/rust/kernel/pci/id.rs b/rust/kernel/pci/id.rs
>> index 4b0ad8d4edc6..fd7a789e3015 100644
>> --- a/rust/kernel/pci/id.rs
>> +++ b/rust/kernel/pci/id.rs
>> @@ -118,15 +118,14 @@ fn try_from(value: u32) -> Result<Self, Self::Error> {
>>   /// ```
>>   /// # use kernel::{device::Core, pci::{self, Vendor}, prelude::*};
>>   /// fn log_device_info(pdev: &pci::Device<Core>) -> Result<()> {
>> -///     // Compare raw vendor ID with known vendor constant
>> -///     let vendor_id = pdev.vendor_id();
>> -///     if vendor_id == Vendor::NVIDIA.as_raw() {
>> -///         dev_info!(
>> -///             pdev.as_ref(),
>> -///             "Found NVIDIA device: 0x{:x}\n",
>> -///             pdev.device_id()
>> -///         );
>> -///     }
>> +///     // Get the validated PCI vendor ID
>> +///     let vendor = pdev.vendor_id();
>> +///     dev_info!(
>> +///         pdev.as_ref(),
>> +///         "Device: Vendor={}, Device=0x{:x}\n",
>> +///         vendor,
>> +///         pdev.device_id()
>> +///     );
> 
> Why not use this new example starting from patch 2, which introduced the
> previous code that this patch removes?

I think that's because in v2 vendor_id() still returns the raw value. I think it
makes a little more sense if this patch simply introduces the example as an
example for vendor_id() itself.

I think struct Vendor does not necessarily need an example by itself.