MEMORY_DEVICE_PCI_P2PDMA 191 drivers/pci/p2pdma.c pgmap->type = MEMORY_DEVICE_PCI_P2PDMA; MEMORY_DEVICE_PCI_P2PDMA 1021 include/linux/mm.h page->pgmap->type == MEMORY_DEVICE_PCI_P2PDMA; MEMORY_DEVICE_PCI_P2PDMA 190 mm/memremap.c case MEMORY_DEVICE_PCI_P2PDMA: