Hi Michael, First bad commit (maybe != root cause): tree: https://git.linaro.org/people/dlezcano/linux timers/drivers/next head: ba82fe3233ec7a10d8b47cc59f93ee844a0da31f commit: 25259f7a5de2de9d67793dc584b15c83a3134c93 [5/22] clocksource/drivers/timer-microchip-pit64b: Select CONFIG_TIMER_OF config: openrisc-randconfig-s001-20200519 (attached as .config) reproduce: # apt-get install sparse # sparse version: v0.6.1-193-gb8fad4bc-dirty git checkout 25259f7a5de2de9d67793dc584b15c83a3134c93 # save the attached .config to linux build tree make C=1 ARCH=openrisc CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) drivers/clocksource/timer-of.c:29:46: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] <asn:3> * @@ got strvoid [noderef] <asn:3> * @@ drivers/clocksource/timer-of.c:29:46: sparse: expected void [noderef] <asn:3> * drivers/clocksource/timer-of.c:29:46: sparse: got struct clock_event_device *clkevt drivers/clocksource/timer-of.c:74:51: sparse: sparse: incorrect type in argument 4 (different address spaces) @@ expected void [noderef] <asn:3> *percpu_dev_id @@ got strvoid [noderef] <asn:3> *percpu_dev_id @@ drivers/clocksource/timer-of.c:74:51: sparse: expected void [noderef] <asn:3> *percpu_dev_id drivers/clocksource/timer-of.c:74:51: sparse: got struct clock_event_device *clkevt vim +151 drivers/clocksource/timer-of.c dc11bae7852952 Daniel Lezcano 2017-06-05 148 5bbf4ad945a9bb Daniel Lezcano 2018-01-08 149 static __init void timer_of_base_exit(struct of_timer_base *of_base) dc11bae7852952 Daniel Lezcano 2017-06-05 150 { dc11bae7852952 Daniel Lezcano 2017-06-05 @151 iounmap(of_base->base); dc11bae7852952 Daniel Lezcano 2017-06-05 152 } dc11bae7852952 Daniel Lezcano 2017-06-05 153 :::::: The code at line 151 was first introduced by commit :::::: dc11bae78529526605c5c45c369c9512fd012093 clocksource/drivers: Add timer-of common init routine :::::: TO: Daniel Lezcano <daniel.lezcano(a)linaro.org&gt; :::::: CC: Daniel Lezcano <daniel.lezcano(a)linaro.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org