I really enjoyed this article. However the following passage seemed a bit hand-wavy to me: >"How will our userland program know which kernel modules to load? L

I really enjoyed this article. However the following passage seemed a bit hand-wavy to me: >"How will our userland program know which kernel modules to load? Linux kernel modules declare patterns for their supported hardware as an alias, e.g.:" initrd# grep virtio_pci lib/modules/5.4.6/modules.alias alias pci:v00001AF4d*sv*sd*bc*sc*i* virtio_pci Devices in sysfs have a modalias file whose content can be matched against these declarations to identify the module to load: initrd# cat /sys/devices/pci0000:00/*/modalias pci:v00001AF4d00001005sv00001AF4sd00000004bc00scFFi00 pci:v00001AF4d00001004sv00001AF4sd00000008bc01sc00i00 >"Hence, for the initial round of module loading, it is sufficient to locate all modalias files within sysfs and load the responsible modules." Could someone elaborate on this a bit? I'm familiar with udevd. Is /sysfs enumerated first and then a match is searched for in lib/modules/5.4.6/modules.alias? Or the other way around? Are these files parsed before normal kernel PCI bus enumeration then? Any other specifics or detail would be greatly appreciated.