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The struct s390_domain_device serves the sole purpose as list entry for the devices list of a struct s390_domain. As it contains no additional information besides a list_head and a pointer to the struct zpci_dev we can simplify things and just thread the device list through struct zpci_dev directly. This removes the need to allocate during domain attach and gets rid of one level of indirection during mapping operations. Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com> Link: https://lore.kernel.org/r/20221025115657.1666860-3-schnelle@linux.ibm.com Signed-off-by: Joerg Roedel <jroedel@suse.de>