On Mon, Nov 16, 2020 at 10:21:26AM +0100, Arnd Bergmann wrote: > On Mon, Nov 16, 2020 at 9:37 AM Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote: > > On Mon, Nov 16, 2020 at 9:33 AM Arnd Bergmann <arnd@xxxxxxxxxx> wrote: > > > On Mon, Nov 16, 2020 at 5:33 AM Randy Dunlap <rdunlap@xxxxxxxxxxxxx> wrote: > > > > On 11/13/20 3:27 PM, kernel test robot wrote: > > > (adding s390 folks to cc) > > > > > > I think fixing this requires a larger-scale effort. I tried building > > > an s390 allmodconfig > > > with CONFIG_PCI disabled, and got warnings and failures in many other places, > > > see full log at the end of this mail. > > > > > > While in theory, all of those should depend on 'HAS_IOMEM' or some other symbol, > > > keeping these dependencies sounds like an uphill battle, and there is not much > > > to be gained from building the drivers for s390 on top of compile-testing them > > > on more conventional architectures. > > > > Don't we need the dependencies on HAS_IOMEM for the CONFIG_UML=y > > case, too? > > I would have expected that as well, but I don't see the problem when building > an arch/um kernel, all I get is > > ERROR: modpost: "devm_platform_ioremap_resource" > [drivers/iio/adc/adi-axi-adc.ko] undefined! > ERROR: modpost: "devm_platform_ioremap_resource" > [drivers/ptp/ptp_ines.ko] undefined! > ERROR: modpost: "devm_ioremap_resource" > [drivers/net/ethernet/xilinx/xilinx_emac.ko] undefined! > ERROR: modpost: "devm_platform_ioremap_resource_byname" > [drivers/net/ethernet/xilinx/ll_temac.ko] undefined! > ERROR: modpost: "devm_ioremap" > [drivers/net/ethernet/xilinx/ll_temac.ko] undefined! > ERROR: modpost: "devm_of_iomap" > [drivers/net/ethernet/xilinx/ll_temac.ko] undefined! > ERROR: modpost: "__open64_2" [fs/hostfs/hostfs.ko] undefined! > > If I disable those five drivers, I can build and link a uml kernel without > warnings. I could not find the difference compared to s390 here. > > Looking a bit further, I now find that we ended up disabling CONFIG_COMPILE_TEST > entirely for arch/um, which is clearly an option that would also work for s390. Yes, that was the easier solution than to spread "depends on HAS_IOMEM" all over Kconfigs. +Cc Greg KH, I got similar report around phy drivers: https://lore.kernel.org/lkml/202011140335.tceVqHmN-lkp@xxxxxxxxx/ When reproducing this, I saw multiple unmet dependencies on s390 for MFD_SYSCON and MFD_STM32_TIMERS. I suppose there is no point to fix them all because this will be basically UML case, so HAS_IOMEM all over the tree. Best regards, Krzysztof
