Re: [Xen-devel] [PATCH v3 02/39] ARM: GIC: add GIC_INVALID to enum gic_version

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Wed, 21 Mar 2018, Andre Przywara wrote:
> The enum gic_version at the moment just contains GIC_V2 and GIC_V3,
> where GIC_V2 happens to map to 0. So without having initialised a
> variable of that type, we will read back GIC_V2 (when allocated with zeroing
> the memory).
> To prevent ambiguities and to give an explicitly uninitialised state, add
> a new first member: GIC_INVALID. Also make it obvious that this has a
> "0" encoding.
> 
> Signed-off-by: Andre Przywara <andre.przywara@xxxxxxxxxx>

Acked-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>


> ---
>  xen/include/asm-arm/gic.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/xen/include/asm-arm/gic.h b/xen/include/asm-arm/gic.h
> index 565b0875ca..3079387e06 100644
> --- a/xen/include/asm-arm/gic.h
> +++ b/xen/include/asm-arm/gic.h
> @@ -227,6 +227,7 @@ struct gic_lr {
>  };
>  
>  enum gic_version {
> +    GIC_INVALID = 0,    /* the default until explicitly set up */
>      GIC_V2,
>      GIC_V3,
>  };
> -- 
> 2.14.1
> 

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