On Thu, Nov 30, 2023 at 09:49:43AM -0800, Sean Christopherson wrote: > On Thu, Nov 30, 2023, Vitaly Kuznetsov wrote: > > kernel test robot <lkp@xxxxxxxxx> writes: > > > > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master > > > head: 3b47bc037bd44f142ac09848e8d3ecccc726be99 > > > commit: a789aeba419647c44d7e7320de20fea037c211d0 KVM: VMX: Rename "vmx/evmcs.{ch}" to "vmx/hyperv.{ch}" > > > date: 1 year ago > > > config: x86_64-randconfig-123-20231130 (https://download.01.org/0day-ci/archive/20231130/202311302231.sinLrAig-lkp@xxxxxxxxx/config) > > > compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07) > > > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231130/202311302231.sinLrAig-lkp@xxxxxxxxx/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 <lkp@xxxxxxxxx> > > > | Closes: https://lore.kernel.org/oe-kbuild-all/202311302231.sinLrAig-lkp@xxxxxxxxx/ > > > > > > sparse warnings: (new ones prefixed by >>) > > > arch/x86/kvm/vmx/hyperv.h:79:30: sparse: sparse: cast truncates bits from constant value (a000a becomes a) > > > > This is what ROL16() macro does but the thing is: we actually want to > > truncate bits by doing an explicit (u16) cast. We can probably replace > > this with '& 0xffff': > > > > #define ROL16(val, n) ((((u16)(val) << (n)) | ((u16)(val) >> (16 - (n)))) & 0xffff) > > > > but honestly I don't see much point... > > Yeah, just ignore 'em, we get the exact same sparse complaints in vmcs12.c and > have had great success ignoring those too :-) Thanks for the information. We've disabled this warning in the bot to avoid sending reports against other files with similar code. Best Regards, Yujie
