Hi Nicolas, kernel test robot noticed the following build errors: [auto build test ERROR on arnd-asm-generic/master] [also build test ERROR on arm/for-next arm/fixes soc/for-next linus/master v6.10-rc6 next-20240703] [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#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Nicolas-Pitre/lib-math-test_div64-add-some-edge-cases-relevant-to-__div64_const32/20240708-013344 base: https://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic.git master patch link: https://lore.kernel.org/r/20240707171919.1951895-5-nico%40fluxnic.net patch subject: [PATCH v2 4/4] __arch_xprod64(): make __always_inline when optimizing for performance config: arm-randconfig-002-20240708 (https://download.01.org/0day-ci/archive/20240708/202407080355.VUEmeBsv-lkp@xxxxxxxxx/config) compiler: arm-linux-gnueabi-gcc (GCC) 13.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240708/202407080355.VUEmeBsv-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/202407080355.VUEmeBsv-lkp@xxxxxxxxx/ All errors (new ones prefixed by >>): scripts/genksyms/parse.y: warning: 9 shift/reduce conflicts [-Wconflicts-sr] scripts/genksyms/parse.y: warning: 5 reduce/reduce conflicts [-Wconflicts-rr] scripts/genksyms/parse.y: note: rerun with option '-Wcounterexamples' to generate conflict counterexamples In file included from include/linux/math.h:6, from include/linux/kernel.h:27, from include/linux/cpumask.h:11, from include/linux/sched.h:16, from arch/arm/kernel/asm-offsets.c:11: >> arch/arm/include/asm/div64.h:60:1: error: return type defaults to 'int' [-Werror=implicit-int] 60 | __arch_xprod_64(uint64_t m, uint64_t n, bool bias) | ^~~~~~~~~~~~~~~ cc1: some warnings being treated as errors make[3]: *** [scripts/Makefile.build:117: arch/arm/kernel/asm-offsets.s] Error 1 shuffle=2335528022 make[3]: Target 'prepare' not remade because of errors. make[2]: *** [Makefile:1208: prepare0] Error 2 shuffle=2335528022 make[2]: Target 'prepare' not remade because of errors. make[1]: *** [Makefile:240: __sub-make] Error 2 shuffle=2335528022 make[1]: Target 'prepare' not remade because of errors. make: *** [Makefile:240: __sub-make] Error 2 shuffle=2335528022 make: Target 'prepare' not remade because of errors. vim +/int +60 arch/arm/include/asm/div64.h 54 55 #ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 56 static __always_inline 57 #else 58 static inline 59 #endif > 60 __arch_xprod_64(uint64_t m, uint64_t n, bool bias) 61 { 62 unsigned long long res; 63 register unsigned int tmp asm("ip") = 0; 64 bool no_ovf = __builtin_constant_p(m) && 65 ((m >> 32) + (m & 0xffffffff) < 0x100000000); 66 67 if (!bias) { 68 asm ( "umull %Q0, %R0, %Q1, %Q2\n\t" 69 "mov %Q0, #0" 70 : "=&r" (res) 71 : "r" (m), "r" (n) 72 : "cc"); 73 } else if (no_ovf) { 74 res = m; 75 asm ( "umlal %Q0, %R0, %Q1, %Q2\n\t" 76 "mov %Q0, #0" 77 : "+&r" (res) 78 : "r" (m), "r" (n) 79 : "cc"); 80 } else { 81 asm ( "umull %Q0, %R0, %Q2, %Q3\n\t" 82 "cmn %Q0, %Q2\n\t" 83 "adcs %R0, %R0, %R2\n\t" 84 "adc %Q0, %1, #0" 85 : "=&r" (res), "+&r" (tmp) 86 : "r" (m), "r" (n) 87 : "cc"); 88 } 89 90 if (no_ovf) { 91 asm ( "umlal %R0, %Q0, %R1, %Q2\n\t" 92 "umlal %R0, %Q0, %Q1, %R2\n\t" 93 "mov %R0, #0\n\t" 94 "umlal %Q0, %R0, %R1, %R2" 95 : "+&r" (res) 96 : "r" (m), "r" (n) 97 : "cc"); 98 } else { 99 asm ( "umlal %R0, %Q0, %R2, %Q3\n\t" 100 "umlal %R0, %1, %Q2, %R3\n\t" 101 "mov %R0, #0\n\t" 102 "adds %Q0, %1, %Q0\n\t" 103 "adc %R0, %R0, #0\n\t" 104 "umlal %Q0, %R0, %R2, %R3" 105 : "+&r" (res), "+&r" (tmp) 106 : "r" (m), "r" (n) 107 : "cc"); 108 } 109 110 return res; 111 } 112 #define __arch_xprod_64 __arch_xprod_64 113 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
