Re: [linux-next:master 5175/8213] arch/x86/kvm/vmx/hyperv_evmcs.h:133:30: sparse: sparse: cast truncates bits from constant value (1b009b becomes 9b)

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Hi Sean,

On Mon, Dec 18, 2023 at 07:06:53AM -0800, Sean Christopherson wrote:
> On Sun, Dec 17, 2023, kernel test robot wrote:
> > Hi Vitaly,
> > 
> > FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.
> > 
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> > head:   17cb8a20bde66a520a2ca7aad1063e1ce7382240
> > commit: e7ad84db4d718e18c7a133e941ba4c7d4c6d4cbf [5175/8213] KVM: VMX: Split off hyperv_evmcs.{ch}
> > config: i386-randconfig-061-20231217 (https://download.01.org/0day-ci/archive/20231217/202312171230.oCaBKFUr-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/20231217/202312171230.oCaBKFUr-lkp@xxxxxxxxx/reproduce)
> 
> Known shortcoming, just ignore it.
> 
> https://lore.kernel.org/all/87v89jmc3q.fsf@xxxxxxxxxx

Sorry for the late reply. We noticed this is another case of sparse
shortcoming. As you suggested in [1], we still keep this sparse warning
enabled, and we are planning to implement "disabling just the ROL16()
warning" for the bot in January. We will come back once this is done.

[1] https://lore.kernel.org/all/ZWoCEUvk3Nlmlb9v@xxxxxxxxxx/

Thanks,
Yujie




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