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Linux 7.0 kernel refactors legacy CardBus setup code into a separate file (setup-cardbus.c) that only builds when CONFIG_CARDBUS is enabled, reducing bloat on modern systems. The PCI subsystem updates also include power management fixes to prevent runtime suspend during device initialization, eliminate redundant D3hot-to-D3cold transition delays, fix potential P2PDMA hangs during device removal, and add support for PCIe M.2 connectors in the power sequencing subsystem along with a new ASpeed root complex Device Tree driver.

Linux 7.0 Better Segregates Legacy CardBus Code To Avoid On Modern PCs