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由于项目调试需要，需要移植新版本的驱动到旧版内核。
移植20180806到20171213
移植linux-xlnx-20180806内核pci文件夹、linux/include/pci.h到linux-xlnx-20171213内核，编译错误，
net/core/rtnetlink.c:842:17: error: implicit declaration of function ‘dev_num_vf’ [-Werror=implicit-function-declaration]
int num_vfs = dev_num_vf(dev->dev.parent);
drivers/nvme/host/pci.c:2124:2: error: unknown field ‘reset_notify’ specified in initializer
.reset_notify = nvme_reset_notify,在pci-20180806.h文件line934添加#define dev_num_vf(d) ((dev_is_pci(d) ? pci_num_vf(to_pci_dev(d)) : 0))，然后注释line2124，再次编译出现错误，
drivers/pci/access.c:4:32: fatal error: linux/sched/signal.h: No such file or directory
#include <linux/sched/signal.h>又产生新错误，放弃。。。
内核代码牵一发而动全身，花式作死
移植host驱动
换一种思路，只移植host的驱动，报错，
drivers/pci/host/pcie-xdma-pl.c:266:11: error: ‘pci_irqd_intx_xlate’ undeclared here (not in a function)
.xlate = pci_irqd_intx_xlate,
^~~~~~~~~~~~~~~~~~~
drivers/pci/host/pcie-xdma-pl.c: In function ‘xilinx_pcie_probe’:
drivers/pci/host/pcie-xdma-pl.c:738:11: error: implicit declaration of function ‘devm_pci_alloc_host_bridge’ [-Werror=implicit-function-declaration]
bridge = devm_pci_alloc_host_bridge(dev, sizeof(*port));
^~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/pci/host/pcie-xdma-pl.c:738:9: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
bridge = devm_pci_alloc_host_bridge(dev, sizeof(*port));
^
drivers/pci/host/pcie-xdma-pl.c:742:9: error: implicit declaration of function ‘pci_host_bridge_priv’ [-Werror=implicit-function-declaration]
port = pci_host_bridge_priv(bridge);
^~~~~~~~~~~~~~~~~~~~
drivers/pci/host/pcie-xdma-pl.c:742:7: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
port = pci_host_bridge_priv(bridge);
^
drivers/pci/host/pcie-xdma-pl.c:773:8: error: ‘struct pci_host_bridge’ has no member named ‘sysdata’
bridge->sysdata = port;
^~
drivers/pci/host/pcie-xdma-pl.c:774:8: error: ‘struct pci_host_bridge’ has no member named ‘busnr’; did you mean ‘bus’?
bridge->busnr = port->root_busno;
^~
drivers/pci/host/pcie-xdma-pl.c:775:8: error: ‘struct pci_host_bridge’ has no member named ‘ops’
bridge->ops = &xilinx_pcie_ops;
^~
drivers/pci/host/pcie-xdma-pl.c:776:8: error: ‘struct pci_host_bridge’ has no member named ‘map_irq’
bridge->map_irq = of_irq_parse_and_map_pci;
^~
drivers/pci/host/pcie-xdma-pl.c:777:8: error: ‘struct pci_host_bridge’ has no member named ‘swizzle_irq’
bridge->swizzle_irq = pci_common_swizzle;
^~
drivers/pci/host/pcie-xdma-pl.c:779:8: error: implicit declaration of function ‘pci_scan_root_bus_bridge’ [-Werror=implicit-function-declaration]
err = pci_scan_root_bus_bridge(bridge);
^~~~~~~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errorsline266复制20180806的pci_irqd_intx_xlate函数进来，
移植devm_pci_alloc_host_bridge函数时发现，pci host bridge的结构体变化太大，移植成功的概率太小，感觉不可行了。
IP
新版ip大变化，切换过去，
