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X-CSE-ConnectionGUID: 8ZRf68vWSWaniYNRKuaKlQ== X-CSE-MsgGUID: RfcGu5CeTZOr6rWOFOq1DQ== X-IronPort-AV: E=McAfee;i="6800,10657,11925"; a="91884093" X-IronPort-AV: E=Sophos;i="6.27,141,1787036400"; d="scan'208";a="91884093" Received: from fmviesa001.fm.intel.com ([10.60.135.141]) by fmvoesa108.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Oct 2026 02:44:17 -0700 X-CSE-ConnectionGUID: 7twUcTn+R3m+yF8YPigM8Q== X-CSE-MsgGUID: 35UnMZgLRpuMb+fuP/tUxQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.27,141,1787036400"; d="scan'208";a="304726224" Received: from igk-lkp-server01.igk.intel.com (HELO d0de6c2a75a7) ([10.211.93.152]) by fmviesa001.fm.intel.com with ESMTP; 05 Oct 2026 02:44:16 -0700 Received: from kbuild by d0de6c2a75a7 with local (Exim 4.98.2) (envelope-from ) id 1xDfEz-0000000004r-38BL; Mon, 05 Oct 2026 09:44:13 +0000 Date: Mon, 05 Oct 2026 11:43:51 +0200 From: kernel test robot To: Jason Gunthorpe Cc: oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org, Joerg Roedel , Kevin Tian , Vasant Hegde Subject: include/linux/bitops.h:273:19: sparse: sparse: cast truncates bits from constant value (ffffffffff000 becomes fffff000) Message-ID: <202610051147.aRijPI8c-lkp@intel.com> User-Agent: s-nail v14.9.25 Precedence: bulk X-Mailing-List: oe-kbuild-all@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: a90ee4305c4a5df72c11b31dacfdc76e00fcf78a commit: aef5de756ea871ab44e3a1a87be6c944e6587c51 iommupt: Add the x86 64 bit page table format date: 11 months ago config: i386-randconfig-2300-20261005 (https://download.01.org/0day-ci/archive/20261005/202610051147.aRijPI8c-lkp@intel.com/config) compiler: gcc-14 (Debian 14.2.0-19) 14.2.0 sparse: v0.6.5-rc1 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261005/202610051147.aRijPI8c-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: aef5de756ea8 ("iommupt: Add the x86 64 bit page table format") | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-kbuild-all/202610051147.aRijPI8c-lkp@intel.com/ sparse warnings: (new ones prefixed by >>) drivers/iommu/generic_pt/fmt/iommu_x86_64.c: note: in included file (through drivers/iommu/generic_pt/fmt/../pt_log2.h, drivers/iommu/generic_pt/fmt/../pt_defs.h, drivers/iommu/generic_pt/fmt/iommu_template.h): >> include/linux/bitops.h:273:19: sparse: sparse: cast truncates bits from constant value (ffffffffff000 becomes fffff000) include/linux/bitops.h:278:16: sparse: sparse: cast truncates bits from constant value (ffffffffff000 becomes fffff000) >> include/linux/bitops.h:273:19: sparse: sparse: cast truncates bits from constant value (ffffffffff000 becomes fffff000) include/linux/bitops.h:278:16: sparse: sparse: cast truncates bits from constant value (ffffffffff000 becomes fffff000) vim +273 include/linux/bitops.h c320592f3f2a1e6 Wolfram Sang 2025-01-07 261 952043ac12a117d Steven Whitehouse 2009-04-23 262 /** 952043ac12a117d Steven Whitehouse 2009-04-23 263 * __ffs64 - find first set bit in a 64 bit word 952043ac12a117d Steven Whitehouse 2009-04-23 264 * @word: The 64 bit word 952043ac12a117d Steven Whitehouse 2009-04-23 265 * 4945cca232ce8bc Geert Uytterhoeven 2021-02-25 266 * On 64 bit arches this is a synonym for __ffs 952043ac12a117d Steven Whitehouse 2009-04-23 267 * The result is not defined if no bits are set, so check that @word 952043ac12a117d Steven Whitehouse 2009-04-23 268 * is non-zero before calling this. 952043ac12a117d Steven Whitehouse 2009-04-23 269 */ 6606c8c7e818865 Kees Cook 2025-08-04 270 static inline __attribute_const__ unsigned int __ffs64(u64 word) 952043ac12a117d Steven Whitehouse 2009-04-23 271 { 952043ac12a117d Steven Whitehouse 2009-04-23 272 #if BITS_PER_LONG == 32 952043ac12a117d Steven Whitehouse 2009-04-23 @273 if (((u32)word) == 0UL) 952043ac12a117d Steven Whitehouse 2009-04-23 274 return __ffs((u32)(word >> 32)) + 32; 952043ac12a117d Steven Whitehouse 2009-04-23 275 #elif BITS_PER_LONG != 64 952043ac12a117d Steven Whitehouse 2009-04-23 276 #error BITS_PER_LONG not 32 or 64 952043ac12a117d Steven Whitehouse 2009-04-23 277 #endif 952043ac12a117d Steven Whitehouse 2009-04-23 278 return __ffs((unsigned long)word); 952043ac12a117d Steven Whitehouse 2009-04-23 279 } 952043ac12a117d Steven Whitehouse 2009-04-23 280 :::::: The code at line 273 was first introduced by commit :::::: 952043ac12a117d8e94bddd9088338d7ad20ca7d bitops: Add __ffs64 bitop :::::: TO: Steven Whitehouse :::::: CC: Steven Whitehouse -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki