linux-kernel - [PATCH] PCI/MSI: Provide missing stub for pci_msix_can_alloc

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Date:   Wed, 29 Mar 2023 13:13:11 -0700
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     bhelgaas@...gle.com, nathan@...nel.org, ndesaulniers@...gle.com,
        trix@...hat.com, tglx@...utronix.de
Cc:     darwi@...utronix.de, kevin.tian@...el.com,
        reinette.chatre@...el.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: [PATCH] PCI/MSI: Provide missing stub for pci_msix_can_alloc_dyn()

pci_msix_can_alloc_dyn() is not declared when CONFIG_PCI_MSI
is disabled.

There is no existing user of pci_msix_can_alloc_dyn() but
work is in progress to change this. This work encounters
the following error when CONFIG_PCI_MSI is disabled:

drivers/vfio/pci/vfio_pci_intrs.c:427:21: error: implicit declaration \
	of function 'pci_msix_can_alloc_dyn' \
	[-Werror=implicit-function-declaration]

Provide definition for pci_msix_can_alloc_dyn() in preparation
for users that need to compile when CONFIG_PCI_MSI is disabled.

Fixes: 34026364df8e ("PCI/MSI: Provide post-enable dynamic allocation interfaces for MSI-X")
Reported-by: kernel test robot <lkp@...el.com>
Link: https://lore.kernel.org/oe-kbuild-all/202303291000.PWFqGCxH-lkp@intel.com/
Signed-off-by: Reinette Chatre <reinette.chatre@...el.com>
---
I missed this one in my previous fix. After this all the functions
in pci.h's #ifdef CONFIG_PCI_MSI portion have stubs when
CONFIG_PCI_MSI is disabled.

 include/linux/pci.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/pci.h b/include/linux/pci.h
index b50e5c79f7e3..a5dda515fcd1 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1624,6 +1624,8 @@ pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
 					      flags, NULL);
 }
 
+static inline bool pci_msix_can_alloc_dyn(struct pci_dev *dev)
+{ return false; }
 static inline struct msi_map pci_msix_alloc_irq_at(struct pci_dev *dev, unsigned int index,
 						   const struct irq_affinity_desc *affdesc)
 {
-- 
2.34.1