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Tue, 20 Sep 2022 04:50:01 +0000 Date: Tue, 20 Sep 2022 12:49:42 +0800 From: kernel test robot To: Dan Williams Cc: kbuild-all@lists.01.org, linux-kernel@vger.kernel.org, Ben Widawsky , Jonathan Cameron Subject: kernel/resource.c:1795:23: sparse: sparse: cast truncates bits from constant value (fffffffff becomes ffffffff) Message-ID: <202209201253.FRw5oo2x-lkp@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 521a547ced6477c54b4b0cc206000406c221b4d6 commit: 23a22cd1c98be518774fe7f7e8a5203af050525a cxl/region: Allocate HPA capacity to regions date: 8 weeks ago config: arm-randconfig-s042-20220919 (https://download.01.org/0day-ci/archive/20220920/202209201253.FRw5oo2x-lkp@intel.com/config) compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.4-39-gce1a6720-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=23a22cd1c98be518774fe7f7e8a5203af050525a git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 23a22cd1c98be518774fe7f7e8a5203af050525a # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arm SHELL=/bin/bash If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot sparse warnings: (new ones prefixed by >>) >> kernel/resource.c:1795:23: sparse: sparse: cast truncates bits from constant value (fffffffff becomes ffffffff) kernel/resource.c:1813:24: sparse: sparse: cast truncates bits from constant value (fffffffff becomes ffffffff) vim +1795 kernel/resource.c 14b80582c43e4f Dan Williams 2022-05-20 1788 14b80582c43e4f Dan Williams 2022-05-20 1789 static resource_size_t gfr_start(struct resource *base, resource_size_t size, 14b80582c43e4f Dan Williams 2022-05-20 1790 resource_size_t align, unsigned long flags) 14b80582c43e4f Dan Williams 2022-05-20 1791 { 14b80582c43e4f Dan Williams 2022-05-20 1792 if (flags & GFR_DESCENDING) { 14b80582c43e4f Dan Williams 2022-05-20 1793 resource_size_t end; 14b80582c43e4f Dan Williams 2022-05-20 1794 14b80582c43e4f Dan Williams 2022-05-20 @1795 end = min_t(resource_size_t, base->end, 14b80582c43e4f Dan Williams 2022-05-20 1796 (1ULL << MAX_PHYSMEM_BITS) - 1); 14b80582c43e4f Dan Williams 2022-05-20 1797 return end - size + 1; 14b80582c43e4f Dan Williams 2022-05-20 1798 } 14b80582c43e4f Dan Williams 2022-05-20 1799 14b80582c43e4f Dan Williams 2022-05-20 1800 return ALIGN(base->start, align); 14b80582c43e4f Dan Williams 2022-05-20 1801 } 14b80582c43e4f Dan Williams 2022-05-20 1802 :::::: The code at line 1795 was first introduced by commit :::::: 14b80582c43e4f550acfd93c2b2cadbe36ea0874 resource: Introduce alloc_free_mem_region() :::::: TO: Dan Williams :::::: CC: Dan Williams -- 0-DAY CI Kernel Test Service https://01.org/lkp