tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: dd81e1c7d5fb126e5fbc5c9e334d7b3ec29a16a0 commit: 4ebbd075bcde7884e078d4360510b989f559bfec KVM: PPC: Book3S HV P9: Use host timer accounting to avoid decrementer read date: 9 weeks ago config: powerpc64-randconfig-s031-20220125 (https://download.01.org/0day-ci/archive/20220125/202201251708.BOnUdbSj-lk...) compiler: powerpc64-linux-gcc (GCC) 11.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.4-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 4ebbd075bcde7884e078d4360510b989f559bfec # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=powerpc SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) arch/powerpc/kernel/time.c:90:5: sparse: sparse: symbol 'decrementer_max' was not declared. Should it be static? arch/powerpc/kernel/time.c:846:9: sparse: expected void const [noderef] __percpu *__vpp_verify arch/powerpc/kernel/time.c:846:9: sparse: got unsigned long long * arch/powerpc/kernel/time.c:846:9: sparse: expected void const [noderef] __percpu *__vpp_verify arch/powerpc/kernel/time.c:846:9: sparse: got unsigned long long * arch/powerpc/kernel/time.c:846:9: sparse: expected void const [noderef] __percpu *__vpp_verify arch/powerpc/kernel/time.c:846:9: sparse: got unsigned long long * arch/powerpc/kernel/time.c:846:9: sparse: expected void const [noderef] __percpu *__vpp_verify arch/powerpc/kernel/time.c:846:9: sparse: got unsigned long long * arch/powerpc/kernel/time.c:846:9: sparse: expected void const [noderef] __percpu *__vpp_verify arch/powerpc/kernel/time.c:846:9: sparse: got unsigned long long * arch/powerpc/kernel/time.c:626:24: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void const [noderef] __percpu *__vpp_verify @@ got unsigned long long * @@ arch/powerpc/kernel/time.c:626:24: sparse: expected void const [noderef] __percpu *__vpp_verify arch/powerpc/kernel/time.c:626:24: sparse: got unsigned long long * arch/powerpc/kernel/time.c:557:24: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void const [noderef] __percpu *__vpp_verify @@ got unsigned long long * @@ arch/powerpc/kernel/time.c:557:24: sparse: expected void const [noderef] __percpu *__vpp_verify arch/powerpc/kernel/time.c:557:24: sparse: got unsigned long long * vim +846 arch/powerpc/kernel/time.c 4a4cfe3836916e1 Tony Breeds 2007-09-22 842 d831d0b83f20588 Tony Breeds 2007-09-21 843 static int decrementer_set_next_event(unsigned long evt, d831d0b83f20588 Tony Breeds 2007-09-21 844 struct clock_event_device *dev) d831d0b83f20588 Tony Breeds 2007-09-21 845 { 6601ec1c2ba9294 Christophe Leroy 2020-09-29 @846 __this_cpu_write(decrementers_next_tb, get_tb() + evt); d831d0b83f20588 Tony Breeds 2007-09-21 847 set_dec(evt); 0215f7d8c53fb19 Benjamin Herrenschmidt 2014-01-14 848 0215f7d8c53fb19 Benjamin Herrenschmidt 2014-01-14 849 /* We may have raced with new irq work */ 0215f7d8c53fb19 Benjamin Herrenschmidt 2014-01-14 850 if (test_irq_work_pending()) 0215f7d8c53fb19 Benjamin Herrenschmidt 2014-01-14 851 set_dec(1); 0215f7d8c53fb19 Benjamin Herrenschmidt 2014-01-14 852 d831d0b83f20588 Tony Breeds 2007-09-21 853 return 0; d831d0b83f20588 Tony Breeds 2007-09-21 854 } d831d0b83f20588 Tony Breeds 2007-09-21 855 :::::: The code at line 846 was first introduced by commit :::::: 6601ec1c2ba929430f5585ce7f9d9960b0e0a01d powerpc: Remove get_tb_or_rtc() :::::: TO: Christophe Leroy <christophe.leroy(a)csgroup.eu&gt; :::::: CC: Michael Ellerman <mpe(a)ellerman.id.au&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org