Re: [BUG] [5.15] Compilation error in arch/x86/kvm/mmu/spte.h with clang-14

[torvic9@mailbox.org]

> Paolo Bonzini <pbonzini@redhat.com> hat am 04.10.2021 11:49 geschrieben:
> 
>  
> On 04/10/21 11:30, torvic9@mailbox.org wrote:
> > 
> >> Paolo Bonzini <pbonzini@redhat.com> hat am 04.10.2021 11:26 geschrieben:
> >>
> >>   
> >> On 04/10/21 11:08, torvic9@mailbox.org wrote:
> >>> I encounter the following issue when compiling 5.15-rc4 with clang-14:
> >>>
> >>> In file included from arch/x86/kvm/mmu/mmu.c:27:
> >>> arch/x86/kvm/mmu/spte.h:318:9: error: use of bitwise '|' with boolean operands [-Werror,-Wbitwise-instead-of-logical]
> >>>           return __is_bad_mt_xwr(rsvd_check, spte) |
> >>>                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >>>                                                    ||
> >>> arch/x86/kvm/mmu/spte.h:318:9: note: cast one or both operands to int to silence this warning
> >>
> >> The warning is wrong, as mentioned in the line right above:
> > 
> > So it's an issue with clang-14 then?
> > (I add Nick and Nathan)
> 
> My clang here doesn't have the option, so I'm going to ask---are you 
> using W=1?  I can see why clang is warning for KVM's code, but in my 
> opinion such a check should only be in -Wextra.

I don't use any options (not that I'm aware of).
Clang version 14.0.0 5f7a5353301b776ffb0e5fb048992898507bf7ee

> 
> Paolo
> 
> >>
> >>           /*
> >>            * Use a bitwise-OR instead of a logical-OR to aggregate the reserved
> >>            * bits and EPT's invalid memtype/XWR checks to avoid an extra Jcc
> >>            * (this is extremely unlikely to be short-circuited as true).
> >>            */
> >>
> >> Paolo
> >