linux-kernel - Re: [PATCH] PCI: Provide pci_free_irq_vectors() for CONFIG

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Message-ID: <15a3a37e-5c3f-4084-a420-34614df243ad@nvidia.com>
Date: Fri, 19 Dec 2025 09:59:46 -0500
From: Joel Fernandes <joelagnelf@...dia.com>
To: Boqun Feng <boqun.feng@...il.com>, Danilo Krummrich <dakr@...nel.org>,
 Bjorn Helgaas <bhelgaas@...gle.com>, Miguel Ojeda <ojeda@...nel.org>
Cc: 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>, linux-pci@...r.kernel.org,
 linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org
Subject: Re: [PATCH] PCI: Provide pci_free_irq_vectors() for CONFIG_PCI=n



On 12/14/2025 9:54 PM, Boqun Feng wrote:
> Commit 473b9f331718 ("rust: pci: fix build failure when CONFIG_PCI_MSI
> is disabled") fixed a build error by providing rust helpers when
> CONFIG_PCI_MSI=n. However the rust helpers rely on the
> pci_alloc_irq_vectors() function is defined, which is not true when
> CONFIG_PCI=n. There are multiple ways to fix this, e.g. a possible fix
> could be just remove the calling of pci_alloc_irq_vectors() since it's
> empty when CONFIG_PCI_MSI=n anyway. However, since PCI irq APIs, such as
> pci_alloc_irq_vectors(), are already defined even when CONFIG_PCI=n, the
> more reasonable fix is to define pci_alloc_irq_vectors() when
> CONFIG_PCI=n and this aligns with the situations of other primitives as
> well.
> 
> Fixes: 473b9f331718 ("rust: pci: fix build failure when CONFIG_PCI_MSI is disabled")
> Signed-off-by: Boqun Feng <boqun.feng@...il.com>
Reviewed-by: Joel Fernandes <joelagnelf@...dia.com>