From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.14]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A6D363E6DCE for ; Wed, 13 May 2026 10:45:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.14 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778669124; cv=none; b=QPDzJBO4xIjfjyIXjLFQ31mBNLojgFpxezrJIzBO5PJ+ziJJarGDg6WURarSTjxDK9ZDh2YL7Rb1ak8qmcktkJXNfoNni/BFBVNilkp3e7vOyuWzbAWigLFz2q2wy7GQzWikeQfmkLZ9G9Zoy8DpRBPYjyiClCOSKdpGxgHfoQg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778669124; c=relaxed/simple; bh=XIBWJCtKiNO8Rm6wrLFw6CaZkxN/hzd99ZgWbA5ws7Y=; h=Date:From:To:Cc:Subject:Message-ID; b=devMdPaABjTg5m2wK+NxkidO3sTN3un6imeHY9PIF2BEAdwyUq+L7SuCerWX3OXqYUNEGLcQ9dbSwPZ/5x7TCZmizL22DK6aFwEO8jPwOfRxhehAbNGDY+9dKXNmSp+/NdRVmNMS9Vp91ArHClQMAyHp7WsTZFOOgDSqzQ5J25Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=oK3pWs9f; arc=none smtp.client-ip=198.175.65.14 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="oK3pWs9f" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1778669122; x=1810205122; h=date:from:to:cc:subject:message-id; bh=XIBWJCtKiNO8Rm6wrLFw6CaZkxN/hzd99ZgWbA5ws7Y=; b=oK3pWs9fEgFmK/eQ2PZmwC7Eax6c0Y6WaFMPqHfs9D5wO5YdPjWEBv35 660fqBaY/4xp4AZKyedxvLj45ygAfbMrGYNUElTd1hBGEqI3YfhmnnTcB TQtobx/u7nf56hkwqBazx0KsfefirTdUAIRMtxzXoT4V5//lge8jsh7tf 5Zp6ghI2WZbncVgBr9Ex1QXUcYGlShXRA0af+x6HhG1ZIkQJsq2nS7KqO PxE1WhDLiP21TlJ9yuAXwe0zn15krXbsAmFxthpaO3TCzcHSb4bdTFgH7 ppODFrSi05bbED1/lq+8FxSyGemKOhmpSBhxbBHd18xOtLwcuztk8KlX0 w==; X-CSE-ConnectionGUID: odba9rlkQhudh7R0FHyZyg== X-CSE-MsgGUID: KjXDifSiQpyX6i8Xe/FdZg== X-IronPort-AV: E=McAfee;i="6800,10657,11784"; a="83464592" X-IronPort-AV: E=Sophos;i="6.23,232,1770624000"; d="scan'208";a="83464592" Received: from fmviesa006.fm.intel.com ([10.60.135.146]) by orvoesa106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 May 2026 03:45:20 -0700 X-CSE-ConnectionGUID: 8Y9l9NuDTb2Q/p9QuabcOg== X-CSE-MsgGUID: jgOPQ0KZQ3e9Sa1qfIjXkw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.23,232,1770624000"; d="scan'208";a="233599545" Received: from lkp-server01.sh.intel.com (HELO dca79079c3eb) ([10.239.97.150]) by fmviesa006.fm.intel.com with ESMTP; 13 May 2026 03:45:18 -0700 Received: from kbuild by dca79079c3eb with local (Exim 4.98.2) (envelope-from ) id 1wN75X-000000003wt-15xQ; Wed, 13 May 2026 10:45:15 +0000 Date: Wed, 13 May 2026 18:44:53 +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 (aaa31337c001d00d becomes c001d00d) Message-ID: <202605131853.YyzJSW8K-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: 1d5dcaa3bd65f2e8c9baa14a393d3a2dc5db7524 commit: ea7caffedd011f7d40abe93a884ffbe46f122535 ARC: atomics: Implement arch_atomic64_cmpxchg using _relaxed date: 11 months ago config: arc-randconfig-r121-20260513 (https://download.01.org/0day-ci/archive/20260513/202605131853.YyzJSW8K-lkp@intel.com/config) compiler: arc-linux-gcc (GCC) 8.5.0 sparse: v0.6.5-rc1 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260513/202605131853.YyzJSW8K-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/202605131853.YyzJSW8K-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 37f8173dd84936e include/linux/atomic-arch-fallback.h Peter Zijlstra 2020-01-24 4126 ad8110706f38117 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4127 /** ad8110706f38117 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4128 * raw_atomic64_cmpxchg() - atomic compare and exchange with full ordering ad8110706f38117 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4129 * @v: pointer to atomic64_t ad8110706f38117 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4130 * @old: s64 value to compare with ad8110706f38117 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4131 * @new: s64 value to assign ad8110706f38117 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4132 * ad8110706f38117 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4133 * If (@v == @old), atomically updates @v to @new with full ordering. 6dfee110c6cc7a6 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2024-02-09 4134 * Otherwise, @v is not modified and relaxed ordering is provided. ad8110706f38117 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4135 * ad8110706f38117 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4136 * Safe to use in noinstr code; prefer atomic64_cmpxchg() elsewhere. ad8110706f38117 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4137 * ad8110706f38117 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4138 * Return: The original value of @v. ad8110706f38117 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4139 */ 37f8173dd84936e include/linux/atomic-arch-fallback.h Peter Zijlstra 2020-01-24 4140 static __always_inline s64 9257959a6e5b4fc include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4141 raw_atomic64_cmpxchg(atomic64_t *v, s64 old, s64 new) 37f8173dd84936e include/linux/atomic-arch-fallback.h Peter Zijlstra 2020-01-24 4142 { 1d78814d41701c2 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4143 #if defined(arch_atomic64_cmpxchg) 1d78814d41701c2 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4144 return arch_atomic64_cmpxchg(v, old, new); 1d78814d41701c2 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4145 #elif defined(arch_atomic64_cmpxchg_relaxed) 37f8173dd84936e include/linux/atomic-arch-fallback.h Peter Zijlstra 2020-01-24 4146 s64 ret; 37f8173dd84936e include/linux/atomic-arch-fallback.h Peter Zijlstra 2020-01-24 4147 __atomic_pre_full_fence(); 9257959a6e5b4fc include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4148 ret = arch_atomic64_cmpxchg_relaxed(v, old, new); 37f8173dd84936e include/linux/atomic-arch-fallback.h Peter Zijlstra 2020-01-24 4149 __atomic_post_full_fence(); 37f8173dd84936e include/linux/atomic-arch-fallback.h Peter Zijlstra 2020-01-24 4150 return ret; 9257959a6e5b4fc include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4151 #else 9257959a6e5b4fc include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 @4152 return raw_cmpxchg(&v->counter, old, new); d12157efc8e083c include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4153 #endif 1d78814d41701c2 include/linux/atomic/atomic-arch-fallback.h Mark Rutland 2023-06-05 4154 } d12157efc8e083c 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