powerpc: Make early memory scan more resilient to out of order nodes

[Milton Miller]

On Wed, 11 May 2011 about 20:58:18 -0000, Benjamin Herrenschmidt wrote:
> We keep track of the size of the lowest block of memory and call
> setup_initial_memory_limit() only after we've parsed them all
> 

Good, we lose our sensitivity to device node ordering.

> diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c

> index 584b398..27475c6 100644
> --- a/arch/powerpc/kernel/prom.c
> +++ b/arch/powerpc/kernel/prom.c
> @@ -70,6 +70,7 @@ int __initdata iommu_force_on;
>  unsigned long tce_alloc_start, tce_alloc_end;
>  u64 ppc64_rma_size;
>  #endif
> +static phys_addr_t first_memblock_size;

__initdata 

(its only referenced by 2 __init functions)

Acked-by: Milton Miller <miltonm at bga.com>


>  static int __init early_parse_mem(char *p)
>  {
..
> @@ -507,11 +508,14 @@ void __init early_init_dt_add_memory_arch(u64 base, u64 size)
..
> @@ -708,6 +712,7 @@ void __init early_init_devtree(void *params)