Re: [Qemu-devel] [PATCH V3 7/7] acpi/cpu-hotplug: introduce help function to keep bit setting in one place

[Igor Mammedov <imammedo@redhat.com>]

On Wed, 17 Sep 2014 09:24:03 +0800
Gu Zheng <guz.fnst@cn.fujitsu.com> wrote:

> Introduce help function acpi_set_local_sts() to simplify acpi_cpu_plug_cb
> and acpi_cpu_hotplug_init, so that we can keep bit setting in one place.
> 
> Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
> ---
>  hw/acpi/cpu_hotplug.c |   22 +++++++++++++++-------
>  1 files changed, 15 insertions(+), 7 deletions(-)
> 
> diff --git a/hw/acpi/cpu_hotplug.c b/hw/acpi/cpu_hotplug.c
> index 7629686..d42c961 100644
> --- a/hw/acpi/cpu_hotplug.c
> +++ b/hw/acpi/cpu_hotplug.c
> @@ -36,8 +36,8 @@ static const MemoryRegionOps AcpiCpuHotplug_ops = {
>      },
>  };
>  
> -void acpi_cpu_plug_cb(ACPIREGS *ar, qemu_irq irq,
> -                      AcpiCpuHotplug *g, CPUState *cpu, Error **errp)
> +static void acpi_set_local_sts(AcpiCpuHotplug *g, CPUState *cpu,
> +                               Error **errp)
>  {
>      CPUClass *k = CPU_GET_CLASS(cpu);
>      int64_t cpu_id;
> @@ -48,9 +48,18 @@ void acpi_cpu_plug_cb(ACPIREGS *ar, qemu_irq irq,
>          return;
>      }
>  
> -    ar->gpe.sts[0] |= ACPI_CPU_HOTPLUG_STATUS;
>      g->sts[cpu_id / 8] |= (1 << (cpu_id % 8));
> +}
>  
> +void acpi_cpu_plug_cb(ACPIREGS *ar, qemu_irq irq,
> +                      AcpiCpuHotplug *g, CPUState *cpu, Error **errp)
> +{
> +    acpi_set_local_sts(g, cpu, errp);
> +    if (*errp != NULL) {
> +        return;
> +    }
> +

> +    ar->gpe.sts[0] |= ACPI_CPU_HOTPLUG_STATUS;
^^^ shouldn't be set for coldplugged CPUs along with IRQ below

>      acpi_update_sci(ar, irq);
>  }
>  
> @@ -60,11 +69,10 @@ void acpi_cpu_hotplug_init(MemoryRegion *parent, Object *owner,
>      CPUState *cpu;
>  
>      CPU_FOREACH(cpu) {
> -        CPUClass *cc = CPU_GET_CLASS(cpu);
> -        int64_t id = cc->get_arch_id(cpu);
> +        Error *local_err = NULL;
>  
> -        g_assert((id / 8) < ACPI_GPE_PROC_LEN);
> -        gpe_cpu->sts[id / 8] |= (1 << (id % 8));
> +        acpi_set_local_sts(gpe_cpu, cpu, &local_err);
> +        g_assert(local_err == NULL);
Wouldn't acpi_cpu_plug_cb() do everything this FOREACH does?
I've suggest to drop CPU_FOREACH() altogether.

>      }
>      memory_region_init_io(&gpe_cpu->io, owner, &AcpiCpuHotplug_ops,
>                            gpe_cpu, "acpi-cpu-hotplug", ACPI_GPE_PROC_LEN);