On Fri, 20 May 2022 at 21:18, Nathan Chancellor <nathan@xxxxxxxxxx> wrote: > > Hi Yury, > > On Fri, May 20, 2022 at 04:24:32PM +0800, kernel test robot wrote: > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master > > head: 21498d01d045c5b95b93e0a0625ae965b4330ebe > > commit: 81db71a60292e9a40ae8f6ef137b17f2aaa15a52 [12308/12886] KVM: x86: hyper-v: replace bitmap_weight() with hweight64() > > config: i386-randconfig-a011 (https://download.01.org/0day-ci/archive/20220520/202205201624.A4IhDdYX-lkp@xxxxxxxxx/config) > > compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project e00cbbec06c08dc616a0d52a20f678b8fbd4e304) > > reproduce (this is a W=1 build): > > wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross > > chmod +x ~/bin/make.cross > > # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=81db71a60292e9a40ae8f6ef137b17f2aaa15a52 > > git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git > > git fetch --no-tags linux-next master > > git checkout 81db71a60292e9a40ae8f6ef137b17f2aaa15a52 > > # save the config file > > mkdir build_dir && cp config build_dir/.config > > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash > > > > If you fix the issue, kindly add following tag as appropriate > > Reported-by: kernel test robot <lkp@xxxxxxxxx> > > > > All warnings (new ones prefixed by >>): > > > > >> arch/x86/kvm/hyperv.c:1983:22: warning: shift count >= width of type [-Wshift-count-overflow] > > if (hc->var_cnt != hweight64(valid_bank_mask)) > > ^~~~~~~~~~~~~~~~~~~~~~~~~~ > > include/asm-generic/bitops/const_hweight.h:29:49: note: expanded from macro 'hweight64' > > #define hweight64(w) (__builtin_constant_p(w) ? __const_hweight64(w) : __arch_hweight64(w)) > > ^~~~~~~~~~~~~~~~~~~~ > > include/asm-generic/bitops/const_hweight.h:21:76: note: expanded from macro '__const_hweight64' > > #define __const_hweight64(w) (__const_hweight32(w) + __const_hweight32((w) >> 32)) > > ^ ~~ > > include/asm-generic/bitops/const_hweight.h:20:49: note: expanded from macro '__const_hweight32' > > #define __const_hweight32(w) (__const_hweight16(w) + __const_hweight16((w) >> 16)) > > ^ > > note: (skipping 1 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all) > > include/asm-generic/bitops/const_hweight.h:10:9: note: expanded from macro '__const_hweight8' > > ((!!((w) & (1ULL << 0))) + \ > > ^ > > include/linux/compiler.h:56:47: note: expanded from macro 'if' > > #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) ) > > ^~~~ > > include/linux/compiler.h:58:52: note: expanded from macro '__trace_if_var' > > #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond)) > > ^~~~ LKFT build system found these build warnings / errors on Linux next-20220520. > I think this is the proper fix, as valid_bank_mask is only assigned u64 > values. Could you fold it into that patch to clear this warning up? The proposed patch below was tested and it fixed the reported problem on 32-bit > Cheers, > Nathan > > diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c > index b652b856df2b..e2e95a6fccfd 100644 > --- a/arch/x86/kvm/hyperv.c > +++ b/arch/x86/kvm/hyperv.c > @@ -1914,7 +1914,7 @@ static u64 kvm_hv_send_ipi(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *hc) > struct hv_send_ipi_ex send_ipi_ex; > struct hv_send_ipi send_ipi; > DECLARE_BITMAP(vcpu_mask, KVM_MAX_VCPUS); > - unsigned long valid_bank_mask; > + u64 valid_bank_mask; > u64 sparse_banks[KVM_HV_MAX_SPARSE_VCPU_SET_BITS]; > u32 vector; > bool all_cpus; Reported-by: Linux Kernel Functional Testing <lkft@xxxxxxxxxx> Tested-by: Linux Kernel Functional Testing <lkft@xxxxxxxxxx> -- Linaro LKFT https://lkft.linaro.org
