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fmviesa001.fm.intel.com with ESMTP; 03 Jun 2026 06:40:22 -0700 Received: from kbuild by f0d55cb201f0 with local (Exim 4.98.2) (envelope-from ) id 1wUlpU-00000000DTM-0Hqo; Wed, 03 Jun 2026 13:40:20 +0000 Date: Wed, 03 Jun 2026 21:39:55 +0800 From: kernel test robot To: Jason Gunthorpe Cc: oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org, linux-snps-arc@lists.infradead.org, Vineet Gupta Subject: include/linux/atomic/atomic-arch-fallback.h:4152:16: sparse: sparse: cast truncates bits from constant value (deadbeefdeafcafe becomes deafcafe) Message-ID: <202606032126.mdl90A9W-lkp@intel.com> User-Agent: s-nail v14.9.25 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: ba3e43a9e601636f5edb54e259a74f96ca3b8fd8 commit: ea7caffedd011f7d40abe93a884ffbe46f122535 ARC: atomics: Implement arch_atomic64_cmpxchg using _relaxed date: 12 months ago config: arc-randconfig-r123-20260603 (https://download.01.org/0day-ci/archive/20260603/202606032126.mdl90A9W-lkp@intel.com/config) compiler: arc-linux-gcc (GCC) 16.1.0 sparse: v0.6.5-rc1 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260603/202606032126.mdl90A9W-lkp@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 | Fixes: ea7caffedd01 ("ARC: atomics: Implement arch_atomic64_cmpxchg using _relaxed") | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-kbuild-all/202606032126.mdl90A9W-lkp@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/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 :::::: CC: Peter Zijlstra -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki