Hi Peter, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on vhost/linux-next] [also build test WARNING on linus/master v5.7-rc7] [cannot apply to kvm/linux-next tip/auto-latest linux/master next-20200522] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Peter-Xu/KVM-Dirty-ring-interface/20200524-070926 base: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next config: s390-randconfig-s002-20200524 (attached as .config) compiler: s390-linux-gcc (GCC) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.1-240-gf0fe1cd9-dirty # save the attached .config to linux build tree make W=1 C=1 ARCH=s390 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>, old ones prefixed by <<): arch/s390/kvm/../../../virt/kvm/kvm_main.c: In function 'kvm_page_in_dirty_ring': >> arch/s390/kvm/../../../virt/kvm/kvm_main.c:2932:16: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits] 2932 | return (pgoff >= KVM_DIRTY_LOG_PAGE_OFFSET) && | ^~ vim +2932 arch/s390/kvm/../../../virt/kvm/kvm_main.c 2926 2927 static bool kvm_page_in_dirty_ring(struct kvm *kvm, unsigned long pgoff) 2928 { 2929 if (!KVM_DIRTY_LOG_PAGE_OFFSET) 2930 return false; 2931 > 2932 return (pgoff >= KVM_DIRTY_LOG_PAGE_OFFSET) && 2933 (pgoff < KVM_DIRTY_LOG_PAGE_OFFSET + 2934 kvm->dirty_ring_size / PAGE_SIZE); 2935 } 2936 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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