Hi Arnd,

On 15/3/25 20:59, Arnd Bergmann wrote:

From: Arnd Bergmann <arnd@arndb.de>

There is no need to go through the GENERIC_IOMAP wrapper for PIO on
nommu platforms, since these always come from PCI I/O space that is
itself memory mapped.

Instead, the generic ioport_map() can just return the MMIO location
of the ports directly by applying the PCI_IO_PA offset, while
ioread32/iowrite32 trivially turn into readl/writel as they do
on most other architectures.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

With this applied this fails to build for me:

   UPD     include/generated/utsversion.h
   CC      init/version-timestamp.o
   LD      vmlinux
m68k-linux-uclibc-ld: drivers/pci/quirks.o: in function `quirk_switchtec_ntb_dma_alias':
quirks.c:(.text+0x23e4): undefined reference to `pci_iomap'
m68k-linux-uclibc-ld: quirks.c:(.text+0x24fe): undefined reference to `pci_iounmap'
m68k-linux-uclibc-ld: drivers/pci/quirks.o: in function `disable_igfx_irq':
quirks.c:(.text+0x32f4): undefined reference to `pci_iomap'
m68k-linux-uclibc-ld: quirks.c:(.text+0x3348): undefined reference to `pci_iounmap'
m68k-linux-uclibc-ld: quirks.c:(.text+0x338a): undefined reference to `pci_iounmap'
m68k-linux-uclibc-ld: quirks.c:(.text+0x33d2): undefined reference to `pci_iounmap'
m68k-linux-uclibc-ld: drivers/pci/quirks.o: in function `reset_ivb_igd':
quirks.c:(.text+0x3502): undefined reference to `pci_iomap'
m68k-linux-uclibc-ld: quirks.c:(.text+0x3658): undefined reference to `pci_iounmap'
m68k-linux-uclibc-ld: quirks.c:(.text+0x3682): undefined reference to `pci_iounmap'
m68k-linux-uclibc-ld: drivers/pci/quirks.o: in function `reset_hinic_vf_dev':
quirks.c:(.text+0x3844): undefined reference to `pci_iomap'
m68k-linux-uclibc-ld: quirks.c:(.text+0x39fc): undefined reference to `pci_iounmap'
m68k-linux-uclibc-ld: quirks.c:(.text+0x3a86): undefined reference to `pci_iounmap'
m68k-linux-uclibc-ld: quirks.c:(.text+0x3ab4): undefined reference to `pci_iounmap'
m68k-linux-uclibc-ld: drivers/pci/quirks.o: in function `quirk_reset_lenovo_thinkpad_p50_nvgpu':
quirks.c:(.text+0x3cf6): undefined reference to `pci_iomap'
m68k-linux-uclibc-ld: drivers/pci/quirks.o: in function `nvme_disable_and_flr':
quirks.c:(.text+0x3e32): undefined reference to `pci_iomap'
m68k-linux-uclibc-ld: quirks.c:(.text+0x3eac): undefined reference to `pci_iounmap'
m68k-linux-uclibc-ld: quirks.c:(.text+0x3fc0): undefined reference to `pci_iounmap'
m68k-linux-uclibc-ld: drivers/pci/devres.o: in function `pcim_addr_resource_release':
devres.c:(.text+0x414): undefined reference to `pci_iounmap'
m68k-linux-uclibc-ld: devres.c:(.text+0x420): undefined reference to `pci_iounmap'
m68k-linux-uclibc-ld: drivers/pci/devres.o: in function `pcim_iomap':
devres.c:(.text+0x524): undefined reference to `pci_iomap'
m68k-linux-uclibc-ld: devres.c:(.text+0x576): undefined reference to `pci_iounmap'
m68k-linux-uclibc-ld: drivers/pci/devres.o: in function `pcim_iomap_range':
devres.c:(.text+0x980): undefined reference to `pci_iomap_range'
m68k-linux-uclibc-ld: drivers/pci/devres.o: in function `pcim_iomap_region':
devres.c:(.text+0xc0e): undefined reference to `pci_iomap'
m68k-linux-uclibc-ld: drivers/net/ethernet/intel/e100.o: in function `e100_remove':
e100.c:(.text+0x1fe6): undefined reference to `pci_iounmap'
m68k-linux-uclibc-ld: drivers/net/ethernet/intel/e100.o: in function `e100_probe':
e100.c:(.text+0x362a): undefined reference to `pci_iomap'
m68k-linux-uclibc-ld: e100.c:(.text+0x381c): undefined reference to `pci_iounmap'
m68k-linux-uclibc-ld: e100.c:(.text+0x3928): undefined reference to `pci_iounmap'
make[2]: *** [scripts/Makefile.vmlinux:77: vmlinux] Error 1
make[1]: *** [/home/gerg/accelerated-linux.lkml/linux/Makefile:1231: vmlinux] Error 2
make: *** [Makefile:251: __sub-make] Error 2

FWIW this was a m5475evb_defconfig with CONFIG_MMU disabled.

Regards
Greg