When CONFIG_HAS_IOMEM is not set/enabled, certain iomap() family functions [including ioremap(), devm_ioremap(), etc.] are not available. Drivers that use these functions should depend on HAS_IOMEM so that they do not cause build errors. Repairs this build error: s390-linux-ld: drivers/dma/altera-msgdma.o: in function `request_and_map': altera-msgdma.c:(.text+0x14b0): undefined reference to `devm_ioremap' Fixes: a85c6f1b2921 ("dmaengine: Add driver for Altera / Intel mSGDMA IP core") Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx> Reported-by: kernel test robot <lkp@xxxxxxxxx> Cc: Stefan Roese <sr@xxxxxxx> Cc: Vinod Koul <vkoul@xxxxxxxxxx> Cc: dmaengine@xxxxxxxxxxxxxxx --- drivers/dma/Kconfig | 1 + 1 file changed, 1 insertion(+) --- linux-next-20210521.orig/drivers/dma/Kconfig +++ linux-next-20210521/drivers/dma/Kconfig @@ -59,6 +59,7 @@ config DMA_OF #devices config ALTERA_MSGDMA tristate "Altera / Intel mSGDMA Engine" + depends on HAS_IOMEM select DMA_ENGINE help Enable support for Altera / Intel mSGDMA controller.