Hi Hans, kernel test robot noticed the following build errors: [auto build test ERROR on ccb98ccef0e543c2bd4ef1a72270461957f3d8d0] url: https://github.com/intel-lab-lkp/linux/commits/Hans-Zhang/misc-pci_endpoint_test-Fix-overflow-of-bar_size/20250102-200548 base: ccb98ccef0e543c2bd4ef1a72270461957f3d8d0 patch link: https://lore.kernel.org/r/20250102120222.1403906-1-18255117159%40163.com patch subject: [v6] misc: pci_endpoint_test: Fix overflow of bar_size config: powerpc-randconfig-003-20250102 (https://download.01.org/0day-ci/archive/20250103/202501030210.iaAEQUA6-lkp@xxxxxxxxx/config) compiler: powerpc-linux-gcc (GCC) 14.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250103/202501030210.iaAEQUA6-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202501030210.iaAEQUA6-lkp@xxxxxxxxx/ All errors (new ones prefixed by >>): In file included from ./arch/powerpc/include/generated/asm/div64.h:1, from include/linux/math.h:6, from include/linux/delay.h:12, from drivers/misc/pci_endpoint_test.c:11: drivers/misc/pci_endpoint_test.c: In function 'pci_endpoint_test_bar': include/asm-generic/div64.h:183:35: warning: comparison of distinct pointer types lacks a cast [-Wcompare-distinct-pointer-types] 183 | (void)(((typeof((n)) *)0) == ((uint64_t *)0)); \ | ^~ drivers/misc/pci_endpoint_test.c:311:18: note: in expansion of macro 'do_div' 311 | remain = do_div(bar_size, buf_size); | ^~~~~~ In file included from include/linux/cleanup.h:5, from drivers/misc/pci_endpoint_test.c:10: include/asm-generic/div64.h:195:32: warning: right shift count >= width of type [-Wshift-count-overflow] 195 | } else if (likely(((n) >> 32) == 0)) { \ | ^~ include/linux/compiler.h:76:45: note: in definition of macro 'likely' 76 | # define likely(x) __builtin_expect(!!(x), 1) | ^ drivers/misc/pci_endpoint_test.c:311:18: note: in expansion of macro 'do_div' 311 | remain = do_div(bar_size, buf_size); | ^~~~~~ >> include/asm-generic/div64.h:199:36: error: passing argument 1 of '__div64_32' from incompatible pointer type [-Wincompatible-pointer-types] 199 | __rem = __div64_32(&(n), __base); \ | ^~~~ | | | resource_size_t * {aka unsigned int *} drivers/misc/pci_endpoint_test.c:311:18: note: in expansion of macro 'do_div' 311 | remain = do_div(bar_size, buf_size); | ^~~~~~ include/asm-generic/div64.h:174:38: note: expected 'uint64_t *' {aka 'long long unsigned int *'} but argument is of type 'resource_size_t *' {aka 'unsigned int *'} 174 | extern uint32_t __div64_32(uint64_t *dividend, uint32_t divisor); | ~~~~~~~~~~^~~~~~~~ vim +/__div64_32 +199 include/asm-generic/div64.h ^1da177e4c3f41 Linus Torvalds 2005-04-16 176 ^1da177e4c3f41 Linus Torvalds 2005-04-16 177 /* The unnecessary pointer compare is there ^1da177e4c3f41 Linus Torvalds 2005-04-16 178 * to check for type safety (n must be 64bit) ^1da177e4c3f41 Linus Torvalds 2005-04-16 179 */ ^1da177e4c3f41 Linus Torvalds 2005-04-16 180 # define do_div(n,base) ({ \ ^1da177e4c3f41 Linus Torvalds 2005-04-16 181 uint32_t __base = (base); \ ^1da177e4c3f41 Linus Torvalds 2005-04-16 182 uint32_t __rem; \ ^1da177e4c3f41 Linus Torvalds 2005-04-16 183 (void)(((typeof((n)) *)0) == ((uint64_t *)0)); \ 911918aa7ef6f8 Nicolas Pitre 2015-11-02 184 if (__builtin_constant_p(__base) && \ 911918aa7ef6f8 Nicolas Pitre 2015-11-02 185 is_power_of_2(__base)) { \ 911918aa7ef6f8 Nicolas Pitre 2015-11-02 186 __rem = (n) & (__base - 1); \ 911918aa7ef6f8 Nicolas Pitre 2015-11-02 187 (n) >>= ilog2(__base); \ c747ce4706190e Geert Uytterhoeven 2021-08-11 188 } else if (__builtin_constant_p(__base) && \ 461a5e51060c93 Nicolas Pitre 2015-10-30 189 __base != 0) { \ 461a5e51060c93 Nicolas Pitre 2015-10-30 190 uint32_t __res_lo, __n_lo = (n); \ 461a5e51060c93 Nicolas Pitre 2015-10-30 191 (n) = __div64_const32(n, __base); \ 461a5e51060c93 Nicolas Pitre 2015-10-30 192 /* the remainder can be computed with 32-bit regs */ \ 461a5e51060c93 Nicolas Pitre 2015-10-30 193 __res_lo = (n); \ 461a5e51060c93 Nicolas Pitre 2015-10-30 194 __rem = __n_lo - __res_lo * __base; \ 911918aa7ef6f8 Nicolas Pitre 2015-11-02 195 } else if (likely(((n) >> 32) == 0)) { \ ^1da177e4c3f41 Linus Torvalds 2005-04-16 196 __rem = (uint32_t)(n) % __base; \ ^1da177e4c3f41 Linus Torvalds 2005-04-16 197 (n) = (uint32_t)(n) / __base; \ c747ce4706190e Geert Uytterhoeven 2021-08-11 198 } else { \ ^1da177e4c3f41 Linus Torvalds 2005-04-16 @199 __rem = __div64_32(&(n), __base); \ c747ce4706190e Geert Uytterhoeven 2021-08-11 200 } \ ^1da177e4c3f41 Linus Torvalds 2005-04-16 201 __rem; \ ^1da177e4c3f41 Linus Torvalds 2005-04-16 202 }) ^1da177e4c3f41 Linus Torvalds 2005-04-16 203 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
