On Sun, Jun 02, 2024 at 12:56:31PM +0800, kernel test robot wrote: > tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master > head: 0e1980c40b6edfa68b6acf926bab22448a6e40c9 > commit: 6ba3d5014d24a46ed329fc567e554c218eb62cfa [2654/3060] ARM: Emulate one-byte cmpxchg > config: arm-randconfig-r051-20240602 (https://download.01.org/0day-ci/archive/20240602/202406021249.imvU1Clu-lkp@xxxxxxxxx/config) > compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project bafda89a0944d947fc4b3b5663185e07a397ac30) > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240602/202406021249.imvU1Clu-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/202406021249.imvU1Clu-lkp@xxxxxxxxx/ > > All errors (new ones prefixed by >>): > > In file included from kernel/bounds.c:13: > In file included from include/linux/log2.h:12: > In file included from include/linux/bitops.h:63: > In file included from arch/arm/include/asm/bitops.h:245: > In file included from include/asm-generic/bitops/lock.h:5: > In file included from include/linux/atomic.h:7: > In file included from arch/arm/include/asm/atomic.h:16: > >> arch/arm/include/asm/cmpxchg.h:167:12: error: call to undeclared function 'cmpxchg_emu_u8'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] > 167 | oldval = cmpxchg_emu_u8((volatile u8 *)ptr, old, new); This is an old commit. This should be fixed by its replacement: 74e3470afaca ("ARM: Emulate one-byte cmpxchg") Thanx, Paul > 1 error generated. > make[3]: *** [scripts/Makefile.build:117: kernel/bounds.s] Error 1 > make[3]: Target 'prepare' not remade because of errors. > make[2]: *** [Makefile:1208: prepare0] Error 2 > make[2]: Target 'prepare' not remade because of errors. > make[1]: *** [Makefile:240: __sub-make] Error 2 > make[1]: Target 'prepare' not remade because of errors. > make: *** [Makefile:240: __sub-make] Error 2 > make: Target 'prepare' not remade because of errors. > > > vim +/cmpxchg_emu_u8 +167 arch/arm/include/asm/cmpxchg.h > > 152 > 153 /* > 154 * cmpxchg only support 32-bits operands on ARMv6. > 155 */ > 156 > 157 static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old, > 158 unsigned long new, int size) > 159 { > 160 unsigned long oldval, res; > 161 > 162 prefetchw((const void *)ptr); > 163 > 164 switch (size) { > 165 #ifdef CONFIG_CPU_V6 /* min ARCH >= ARMv6K */ > 166 case 1: > > 167 oldval = cmpxchg_emu_u8((volatile u8 *)ptr, old, new); > 168 break; > 169 #else > 170 case 1: > 171 do { > 172 asm volatile("@ __cmpxchg1\n" > 173 " ldrexb %1, [%2]\n" > 174 " mov %0, #0\n" > 175 " teq %1, %3\n" > 176 " strexbeq %0, %4, [%2]\n" > 177 : "=&r" (res), "=&r" (oldval) > 178 : "r" (ptr), "Ir" (old), "r" (new) > 179 : "memory", "cc"); > 180 } while (res); > 181 break; > 182 case 2: > 183 do { > 184 asm volatile("@ __cmpxchg1\n" > 185 " ldrexh %1, [%2]\n" > 186 " mov %0, #0\n" > 187 " teq %1, %3\n" > 188 " strexheq %0, %4, [%2]\n" > 189 : "=&r" (res), "=&r" (oldval) > 190 : "r" (ptr), "Ir" (old), "r" (new) > 191 : "memory", "cc"); > 192 } while (res); > 193 break; > 194 #endif > 195 case 4: > 196 do { > 197 asm volatile("@ __cmpxchg4\n" > 198 " ldrex %1, [%2]\n" > 199 " mov %0, #0\n" > 200 " teq %1, %3\n" > 201 " strexeq %0, %4, [%2]\n" > 202 : "=&r" (res), "=&r" (oldval) > 203 : "r" (ptr), "Ir" (old), "r" (new) > 204 : "memory", "cc"); > 205 } while (res); > 206 break; > 207 default: > 208 __bad_cmpxchg(ptr, size); > 209 oldval = 0; > 210 } > 211 > 212 return oldval; > 213 } > 214 > > -- > 0-DAY CI Kernel Test Service > https://github.com/intel/lkp-tests/wiki
