Re: [Xen-devel] [for-4.7 3/5] xen/arm: acpi: Fix SMP support when booting with ACPI

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Thu, 7 Apr 2016, Julien Grall wrote:
> The variable enabled_cpus is used to know the number of CPU enabled in
> the MADT.
> 
> Currently this variable is used to check the validity of the boot CPU.
> It will be considered invalid when "enabled_cpus > 1".
> 
> However, this condition also means that multiple CPUs are present on the
> system. So secondary will never be brought up.
> 
> The correct way to check the validity of the boot CPU is to use the
> variable bootcpu_valid.
> 
> Signed-off-by: Julien Grall <julien.grall@xxxxxxx>

Reviewed-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>


>  xen/arch/arm/acpi/boot.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/xen/arch/arm/acpi/boot.c b/xen/arch/arm/acpi/boot.c
> index 2a71660..fd29bdc 100644
> --- a/xen/arch/arm/acpi/boot.c
> +++ b/xen/arch/arm/acpi/boot.c
> @@ -149,7 +149,7 @@ void __init acpi_smp_init_cpus(void)
>          return;
>      }
>  
> -    if ( enabled_cpus > 1 )
> +    if ( !bootcpu_valid )
>      {
>          printk("MADT missing boot CPU MPIDR, not enabling secondaries\n");
>          return;
> -- 
> 1.9.1
> 

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