CONFIG_PCI_MSI_ARCH_FALLBACKS (not configurable)

modulename: legacy.ko

configname: CONFIG_PCI_MSI_ARCH_FALLBACKS

Linux Kernel Configuration
└─>Device Drivers
└─>PCI support
└─>PCI_MSI_ARCH_FALLBACKS
In linux kernel since version 4.14.326 (release Date: 2023-09-23)  
source code:
drivers/pci/msi/legacy.c
depends
CONFIG_PCI