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Date: Mon, 23 May 2022 07:54:01 +0200
From: Paolo Bonzini <pbonzini@...hat.com>
To: Naresh Kamboju <naresh.kamboju@...aro.org>,
Nathan Chancellor <nathan@...nel.org>,
Vitaly Kuznetsov <vkuznets@...hat.com>,
Yury Norov <yury.norov@...il.com>
CC: kernel test robot <lkp@...el.com>, llvm@...ts.linux.dev,
kbuild-all@...ts.01.org,
Linux Memory Management List <linux-mm@...ck.org>,
Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>,
"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
Jim Mattson <jmattson@...gle.com>,
Joerg Roedel <joro@...tes.org>,
Sean Christopherson <seanjc@...gle.com>,
Thomas Gleixner <tglx@...utronix.de>,
Wanpeng Li <wanpengli@...cent.com>,
kvm list <kvm@...r.kernel.org>,
open list <linux-kernel@...r.kernel.org>,
X86 ML <x86@...nel.org>, lkft-triage@...ts.linaro.org
Subject: Re: [linux-next:master 12308/12886] arch/x86/kvm/hyperv.c:1983:22: warning: shift count >= width of type
The patch is already merged in 5.18.
Paolo
Il 23 maggio 2022 07:49:42 CEST, Naresh Kamboju <naresh.kamboju@...aro.org> ha scritto:
>On Fri, 20 May 2022 at 21:18, Nathan Chancellor <nathan@...nel.org> 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@intel.com/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@...el.com>
>> >
>> > 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@...aro.org>
>Tested-by: Linux Kernel Functional Testing <lkft@...aro.org>
>
>--
>Linaro LKFT
>https://lkft.linaro.org
>
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