Commit 0788257aeebe ("hwrng: Explicitly include correct DT includes") removed an implicit include of io.h. On most architectures, there's still an implicit include of it, but not on s390. Enabling COMPILE_TEST in commit 1ce1cd8208ad ("hwrng: Enable COMPILE_TEST for more drivers") exposed this. Fixes: 0788257aeebe ("hwrng: Explicitly include correct DT includes") Reported-by: kernel test robot <lkp@xxxxxxxxx> Closes: https://lore.kernel.org/oe-kbuild-all/202308042049.8R2tNRoo-lkp@xxxxxxxxx/ Signed-off-by: Rob Herring <robh@xxxxxxxxxx> --- drivers/char/hw_random/xgene-rng.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/char/hw_random/xgene-rng.c b/drivers/char/hw_random/xgene-rng.c index c25bb169563d..99f4e86ac3e9 100644 --- a/drivers/char/hw_random/xgene-rng.c +++ b/drivers/char/hw_random/xgene-rng.c @@ -14,6 +14,7 @@ #include <linux/hw_random.h> #include <linux/init.h> #include <linux/interrupt.h> +#include <linux/io.h> #include <linux/module.h> #include <linux/mod_devicetable.h> #include <linux/platform_device.h> -- 2.40.1