Hi Leonardo, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on powerpc/next] [also build test WARNING on v5.12-rc6 next-20210407] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Leonardo-Bras/powerpc-iommu-Enable-remaining-IOMMU-Pagesizes-present-in-LoPAR/20210408-035800 base: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next config: powerpc-allyesconfig (attached as .config) compiler: powerpc64-linux-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/0day-ci/linux/commit/faa8b10e5b9652dbd56ed8e759a1cc09b95805be git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Leonardo-Bras/powerpc-iommu-Enable-remaining-IOMMU-Pagesizes-present-in-LoPAR/20210408-035800 git checkout faa8b10e5b9652dbd56ed8e759a1cc09b95805be # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All warnings (new ones prefixed by >>): In file included from include/vdso/const.h:5, from include/linux/const.h:4, from include/linux/bits.h:5, from include/linux/bitops.h:6, from include/linux/kernel.h:11, from include/asm-generic/bug.h:20, from arch/powerpc/include/asm/bug.h:109, from include/linux/bug.h:5, from include/linux/mmdebug.h:5, from include/linux/gfp.h:5, from include/linux/slab.h:15, from arch/powerpc/platforms/pseries/iommu.c:15: arch/powerpc/platforms/pseries/iommu.c: In function 'iommu_get_page_shift': >> include/uapi/linux/const.h:20:19: warning: conversion from 'long long unsigned int' to 'unsigned int' changes value from '17179869184' to '0' [-Woverflow] 20 | #define __AC(X,Y) (X##Y) | ^~~~~~ include/uapi/linux/const.h:21:18: note: in expansion of macro '__AC' 21 | #define _AC(X,Y) __AC(X,Y) | ^~~~ include/linux/sizes.h:48:19: note: in expansion of macro '_AC' 48 | #define SZ_16G _AC(0x400000000, ULL) | ^~~ arch/powerpc/platforms/pseries/iommu.c:1120:42: note: in expansion of macro 'SZ_16G' 1120 | { QUERY_DDW_PGSIZE_16G, __builtin_ctz(SZ_16G) }, | ^~~~~~ vim +20 include/uapi/linux/const.h 9d291e787b2b71 include/asm-x86_64/const.h Vivek Goyal 2007-05-02 6 9d291e787b2b71 include/asm-x86_64/const.h Vivek Goyal 2007-05-02 7 /* Some constant macros are used in both assembler and 9d291e787b2b71 include/asm-x86_64/const.h Vivek Goyal 2007-05-02 8 * C code. Therefore we cannot annotate them always with 6df95fd7ad9a84 include/linux/const.h Randy Dunlap 2007-05-08 9 * 'UL' and other type specifiers unilaterally. We 9d291e787b2b71 include/asm-x86_64/const.h Vivek Goyal 2007-05-02 10 * use the following macros to deal with this. 74ef649fe847fd include/linux/const.h Jeremy Fitzhardinge 2008-01-30 11 * 74ef649fe847fd include/linux/const.h Jeremy Fitzhardinge 2008-01-30 12 * Similarly, _AT() will cast an expression with a type in C, but 74ef649fe847fd include/linux/const.h Jeremy Fitzhardinge 2008-01-30 13 * leave it unchanged in asm. 9d291e787b2b71 include/asm-x86_64/const.h Vivek Goyal 2007-05-02 14 */ 9d291e787b2b71 include/asm-x86_64/const.h Vivek Goyal 2007-05-02 15 9d291e787b2b71 include/asm-x86_64/const.h Vivek Goyal 2007-05-02 16 #ifdef __ASSEMBLY__ 9d291e787b2b71 include/asm-x86_64/const.h Vivek Goyal 2007-05-02 17 #define _AC(X,Y) X 74ef649fe847fd include/linux/const.h Jeremy Fitzhardinge 2008-01-30 18 #define _AT(T,X) X 9d291e787b2b71 include/asm-x86_64/const.h Vivek Goyal 2007-05-02 19 #else 9d291e787b2b71 include/asm-x86_64/const.h Vivek Goyal 2007-05-02 @20 #define __AC(X,Y) (X##Y) 9d291e787b2b71 include/asm-x86_64/const.h Vivek Goyal 2007-05-02 21 #define _AC(X,Y) __AC(X,Y) 74ef649fe847fd include/linux/const.h Jeremy Fitzhardinge 2008-01-30 22 #define _AT(T,X) ((T)(X)) 9d291e787b2b71 include/asm-x86_64/const.h Vivek Goyal 2007-05-02 23 #endif 9d291e787b2b71 include/asm-x86_64/const.h Vivek Goyal 2007-05-02 24 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org