Hi Andrew, FYI, the error/warning still remains. tree: git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git ti-rt-linux-5.10.y head: 1f6e95d4b12d73bd1728286f3ccc938df7b77954 commit: db3f0424e62cd12a92e31ea8c8a029ff0ce9b181 [8113/9999] dma-buf: heaps: Add Carveout heap to dmabuf heaps config: s390-allmodconfig (https://download.01.org/0day-ci/archive/20220210/202202101315.aZWctsHc-lk...) compiler: s390-linux-gcc (GCC) 11.2.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git remote add ti git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git git fetch --no-tags ti ti-rt-linux-5.10.y git checkout db3f0424e62cd12a92e31ea8c8a029ff0ce9b181 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=s390 SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): s390-linux-ld: kernel/dma/coherent.o: in function `dma_init_coherent_memory': coherent.c:(.text+0x3dc): undefined reference to `memremap' s390-linux-ld: coherent.c:(.text+0x50e): undefined reference to `memunmap' s390-linux-ld: kernel/dma/coherent.o: in function `dma_declare_coherent_memory': coherent.c:(.text+0x826): undefined reference to `memunmap' s390-linux-ld: drivers/irqchip/irq-al-fic.o: in function `al_fic_init_dt': irq-al-fic.c:(.init.text+0x6c): undefined reference to `of_iomap' s390-linux-ld: irq-al-fic.c:(.init.text+0x4aa): undefined reference to `iounmap' s390-linux-ld: drivers/clk/clk-fixed-mmio.o: in function `fixed_mmio_clk_setup': clk-fixed-mmio.c:(.text+0x9a): undefined reference to `of_iomap' s390-linux-ld: clk-fixed-mmio.c:(.text+0xe6): undefined reference to `iounmap' s390-linux-ld: drivers/dma-buf/heaps/carveout-heap.o: in function `dma_heap_vunmap': s390-linux-ld: drivers/dma-buf/heaps/carveout-heap.o: in function `dma_heap_vmap': s390-linux-ld: drivers/dma-buf/heaps/carveout-heap.o: in function `dma_heap_dma_buf_release': carveout-heap.c:(.text+0x386): undefined reference to `memunmap' s390-linux-ld: drivers/clocksource/timer-of.o: in function `timer_of_init': timer-of.c:(.init.text+0x106): undefined reference to `of_iomap' s390-linux-ld: timer-of.c:(.init.text+0x73a): undefined reference to `iounmap' s390-linux-ld: drivers/clocksource/timer-of.o: in function `timer_of_cleanup': timer-of.c:(.init.text+0x8fe): undefined reference to `iounmap' s390-linux-ld: drivers/clocksource/timer-microchip-pit64b.o: in function `mchp_pit64b_dt_init_timer': timer-microchip-pit64b.c:(.init.text+0x5aa): undefined reference to `of_iomap' s390-linux-ld: timer-microchip-pit64b.c:(.init.text+0xb12): undefined reference to `iounmap' Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for MFD_CORE Depends on HAS_IOMEM Selected by - MFD_HI6421_SPMI && STAGING && OF && SPMI --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org