[libvirt] [PATCH go] domain.go: construct cpumaps correctly for CPU pinning verbs

[Leonid Podolny]

Please ignore this patch, I failed to see that in 2 out of 4 locations we
already are looking at the value. I'm sending a better patch instead.

On Tue, Feb 14, 2017 at 4:48 PM, Leonid Podolny <leonid at podolny.net> wrote:

> In PinVcpu(), PinVcpuFlags(), PinEmulator() and PinIOThread() there is
> an almost identical code that converts []bool into a bitmask. It
> calculates the location in the bitmask and then sets it always to 1,
> instead of looking at the actual bool value.
> ---
>  domain.go | 16 ++++++++++++----
>  1 file changed, 12 insertions(+), 4 deletions(-)
>
> diff --git a/domain.go b/domain.go
> index 5482f1a..9a24bc5 100644
> --- a/domain.go
> +++ b/domain.go
> @@ -1750,7 +1750,9 @@ func (d *Domain) PinVcpu(vcpu uint, cpuMap []bool)
> error {
>                 if cpuMap[i] {
>                         byte := i / 8
>                         bit := i % 8
> -                       ccpumap[byte] |= (1 << uint(bit))
> +                       if cpuMap[i] {
> +                               ccpumap[byte] |= (1 << uint(bit))
> +                       }
>                 }
>         }
>
> @@ -1770,7 +1772,9 @@ func (d *Domain) PinVcpuFlags(vcpu uint, cpuMap
> []bool, flags DomainModification
>                 if cpuMap[i] {
>                         byte := (i + 7) / 8
>                         bit := i % 8
> -                       ccpumap[byte] |= (1 << uint(bit))
> +                       if cpuMap[i] {
> +                               ccpumap[byte] |= (1 << uint(bit))
> +                       }
>                 }
>         }
>
> @@ -3970,7 +3974,9 @@ func (d *Domain) PinEmulator(cpumap []bool, flags
> DomainModificationImpact) erro
>                 byte := i / 8
>                 bit := i % 8
>
> -               ccpumaps[byte] |= (1 << uint(bit))
> +               if cpumap[i] {
> +                       ccpumaps[byte] |= (1 << uint(bit))
> +               }
>         }
>
>         ret := C.virDomainPinEmulator(d.ptr, &ccpumaps[0], C.int(maplen),
> C.uint(flags))
> @@ -3992,7 +3998,9 @@ func (d *Domain) PinIOThread(iothreadid uint, cpumap
> []bool, flags DomainModific
>                 byte := i / 8
>                 bit := i % 8
>
> -               ccpumaps[byte] |= (1 << uint(bit))
> +               if cpumap[i] {
> +                       ccpumaps[byte] |= (1 << uint(bit))
> +               }
>         }
>
>         ret := C.virDomainPinIOThreadCompat(d.ptr, C.uint(iothreadid),
> &ccpumaps[0], C.int(maplen), C.uint(flags))
> --
> 2.11.0
>
>
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