tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 3be1a7a31fbda82f3604b6c31e4f390110de1b46 commit: ef7647b215c919a82ee3235b80998c9bb3a915a3 [5727/13629] ARC: atomics: Implement arch_atomic64_cmpxchg using _relaxed config: arc-randconfig-r121-20250526 (https://download.01.org/0day-ci/archive/20250527/202505270146.ylokxxv2-...@intel.com/config) compiler: arc-linux-gcc (GCC) 8.5.0 reproduce: (https://download.01.org/0day-ci/archive/20250527/202505270146.ylokxxv2-...@intel.com/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 <l...@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202505270146.ylokxxv2-...@intel.com/ sparse warnings: (new ones prefixed by >>) lib/atomic64_test.c: note: in included file (through include/linux/atomic.h, include/asm-generic/bitops/lock.h, arch/arc/include/asm/bitops.h, ...): include/linux/atomic/atomic-arch-fallback.h:4152:16: sparse: sparse: cast truncates bits from constant value (aaa31337c001d00d becomes c001d00d) >> include/linux/atomic/atomic-arch-fallback.h:4152:16: sparse: sparse: cast >> truncates bits from constant value (deadbeefdeafcafe becomes deafcafe) include/linux/atomic/atomic-arch-fallback.h:4181:16: sparse: sparse: cast truncates bits from constant value (aaa31337c001d00d becomes c001d00d) include/linux/atomic/atomic-arch-fallback.h:4181:16: sparse: sparse: cast truncates bits from constant value (deadbeefdeafcafe becomes deafcafe) include/linux/atomic/atomic-arch-fallback.h:4209:16: sparse: sparse: cast truncates bits from constant value (aaa31337c001d00d becomes c001d00d) include/linux/atomic/atomic-arch-fallback.h:4209:16: sparse: sparse: cast truncates bits from constant value (deadbeefdeafcafe becomes deafcafe) include/linux/atomic/atomic-arch-fallback.h:4234:16: sparse: sparse: cast truncates bits from constant value (aaa31337c001d00d becomes c001d00d) include/linux/atomic/atomic-arch-fallback.h:4234:16: sparse: sparse: cast truncates bits from constant value (deadbeefdeafcafe becomes deafcafe) include/linux/atomic/atomic-arch-fallback.h:4152:16: sparse: sparse: cast truncates bits from constant value (faceabadf00df001 becomes f00df001) >> include/linux/atomic/atomic-arch-fallback.h:4152:16: sparse: sparse: cast >> truncates bits from constant value (deadbeefdeafcafe becomes deafcafe) include/linux/atomic/atomic-arch-fallback.h:4181:16: sparse: sparse: cast truncates bits from constant value (faceabadf00df001 becomes f00df001) include/linux/atomic/atomic-arch-fallback.h:4181:16: sparse: sparse: cast truncates bits from constant value (deadbeefdeafcafe becomes deafcafe) include/linux/atomic/atomic-arch-fallback.h:4209:16: sparse: sparse: cast truncates bits from constant value (faceabadf00df001 becomes f00df001) include/linux/atomic/atomic-arch-fallback.h:4209:16: sparse: sparse: cast truncates bits from constant value (deadbeefdeafcafe becomes deafcafe) include/linux/atomic/atomic-arch-fallback.h:4234:16: sparse: sparse: cast truncates bits from constant value (faceabadf00df001 becomes f00df001) include/linux/atomic/atomic-arch-fallback.h:4234:16: sparse: sparse: cast truncates bits from constant value (deadbeefdeafcafe becomes deafcafe) vim +4152 include/linux/atomic/atomic-arch-fallback.h 37f8173dd84936 include/linux/atomic-arch-fallback.h Peter Zijlstra 2020-01-24 4126 ad8110706f3811 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4127 /** ad8110706f3811 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4128 * raw_atomic64_cmpxchg() - atomic compare and exchange with full ordering ad8110706f3811 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4129 * @v: pointer to atomic64_t ad8110706f3811 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4130 * @old: s64 value to compare with ad8110706f3811 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4131 * @new: s64 value to assign ad8110706f3811 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4132 * ad8110706f3811 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4133 * If (@v == @old), atomically updates @v to @new with full ordering. 6dfee110c6cc7a include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2024-02-09 4134 * Otherwise, @v is not modified and relaxed ordering is provided. ad8110706f3811 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4135 * ad8110706f3811 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4136 * Safe to use in noinstr code; prefer atomic64_cmpxchg() elsewhere. ad8110706f3811 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4137 * ad8110706f3811 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4138 * Return: The original value of @v. ad8110706f3811 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4139 */ 37f8173dd84936 include/linux/atomic-arch-fallback.h Peter Zijlstra 2020-01-24 4140 static __always_inline s64 9257959a6e5b4f include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4141 raw_atomic64_cmpxchg(atomic64_t *v, s64 old, s64 new) 37f8173dd84936 include/linux/atomic-arch-fallback.h Peter Zijlstra 2020-01-24 4142 { 1d78814d41701c include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4143 #if defined(arch_atomic64_cmpxchg) 1d78814d41701c include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4144 return arch_atomic64_cmpxchg(v, old, new); 1d78814d41701c include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4145 #elif defined(arch_atomic64_cmpxchg_relaxed) 37f8173dd84936 include/linux/atomic-arch-fallback.h Peter Zijlstra 2020-01-24 4146 s64 ret; 37f8173dd84936 include/linux/atomic-arch-fallback.h Peter Zijlstra 2020-01-24 4147 __atomic_pre_full_fence(); 9257959a6e5b4f include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4148 ret = arch_atomic64_cmpxchg_relaxed(v, old, new); 37f8173dd84936 include/linux/atomic-arch-fallback.h Peter Zijlstra 2020-01-24 4149 __atomic_post_full_fence(); 37f8173dd84936 include/linux/atomic-arch-fallback.h Peter Zijlstra 2020-01-24 4150 return ret; 9257959a6e5b4f include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4151 #else 9257959a6e5b4f include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 @4152 return raw_cmpxchg(&v->counter, old, new); d12157efc8e083 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4153 #endif 1d78814d41701c include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4154 } d12157efc8e083 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4155 :::::: The code at line 4152 was first introduced by commit :::::: 9257959a6e5b4fca6fc8e985790bff62c2046f20 locking/atomic: scripts: restructure fallback ifdeffery :::::: TO: Mark Rutland <mark.rutl...@arm.com> :::::: CC: Peter Zijlstra <pet...@infradead.org> -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki _______________________________________________ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc
