[Skiboot] [RFC PATCH 6/6] core/init: Allow setting size of payload in device-tree

[Oliver O'Halloran]

On Wed, Dec 18, 2019 at 3:52 PM Jordan Niethe <jniethe5 at gmail.com> wrote:
>
> When a kernel is preloaded by Mambo, the size is already known. Make
> this available in the device-tree so that the size does not need to be
> calculated from the elf by skiboot.
>
> Signed-off-by: Jordan Niethe <jniethe5 at gmail.com>
> ---
>  core/init.c                | 5 ++++-
>  external/mambo/skiboot.tcl | 1 +
>  2 files changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/core/init.c b/core/init.c
> index 58e99c6163c1..419bfe28996b 100644
> --- a/core/init.c
> +++ b/core/init.c
> @@ -415,7 +415,10 @@ static bool load_kernel(void)
>                         memcpy_null(NULL, old_vectors, EXCEPTION_VECTORS_END);
>                         sync_icache();
>                 }
> -               kernel_size = 0;
> +               if (dt_has_node_property(dt_chosen, "kernel-size", NULL))
> +                       kernel_size = dt_prop_get_u64(dt_chosen, "kernel-size");
> +               else
> +                       kernel_size = 0;

You can simplify this to:

dt_prop_get_u64_def(dt_chosen, "kernel-size", 0);