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

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Message-ID: <20251215025444.65544-1-boqun.feng@gmail.com>
Date: Mon, 15 Dec 2025 11:54:44 +0900
From: Boqun Feng <boqun.feng@...il.com>
To: Danilo Krummrich <dakr@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Miguel Ojeda <ojeda@...nel.org>
Cc: 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>,
	Joel Fernandes <joelagnelf@...dia.com>,
	linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	rust-for-linux@...r.kernel.org
Subject: [PATCH] PCI: Provide pci_free_irq_vectors() for CONFIG_PCI=n

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>
---
I hit a build error without this:

../rust/helpers/pci.c:36:2: error: call to undeclared function 'pci_free_irq_vectors'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
   36 |         pci_free_irq_vectors(dev);
      |         ^
../rust/helpers/pci.c:36:2: note: did you mean 'pci_alloc_irq_vectors'?
../include/linux/pci.h:2208:1: note: 'pci_alloc_irq_vectors' declared here
 2208 | pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
      | ^
1 error generated.

when ./tools/testing/kunit/kunit.py run --make_options LLVM=1 --arch arm64 --kconfig_add CONFIG_RUST=y  rust_doctests_kernel

 include/linux/pci.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 864775651c6f..b5cc0c2b9906 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -2210,6 +2210,10 @@ pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
 {
 	return -ENOSPC;
 }
+
+static inline void pci_free_irq_vectors(struct pci_dev *dev)
+{
+}
 #endif /* CONFIG_PCI */
 
 /* Include architecture-dependent settings and functions */
-- 
2.51.0