Re: [Qemu-devel] [PATCH 5/7] spapr: Add a helper for node0_size calculation

[Nishanth Aravamudan <nacc@linux.vnet.ibm.com>]

On 16.06.2014 [17:53:51 +1000], Alexey Kardashevskiy wrote:
> In multiple places there is a node0_size variable calculation
> which assumes that NUMA node #0 and memory node #0 are the same
> things which they are not. Since we are going to change it and
> do not want to change it in multiple places, let's make a helper.
> 
> This adds a spapr_node0_size() helper and makes use of it.
> 
> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
> ---
>  hw/ppc/spapr.c | 20 +++++++++++++++++---
>  1 file changed, 17 insertions(+), 3 deletions(-)
> 
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index 10202e2..00ef7a1 100644
> --- a/hw/ppc/spapr.c
> +++ b/hw/ppc/spapr.c
> @@ -351,6 +351,20 @@ static size_t create_page_sizes_prop(CPUPPCState *env, uint32_t *prop,
>      return (p - prop) * sizeof(uint32_t);
>  }
> 
> +static hwaddr spapr_node0_size(void)
> +{
> +    if (nb_numa_nodes > 1) {
> +        int i;
> +        for (i = 0; i < nb_numa_nodes; ++i) {
> +            if (node_mem[i]) {
> +                return MIN(pow2floor(node_mem[i]), ram_size);
> +            }
> +        }
> +        return ram_size;

Can't this just fall-through as well to the below return?

> +    }
> +    return ram_size;
> +}
> +
>  #define _FDT(exp) \
>      do { \
>          int ret = (exp);                                           \
> @@ -851,8 +865,8 @@ static void spapr_reset_htab(sPAPREnvironment *spapr)
> 
>      /* Update the RMA size if necessary */
>      if (spapr->vrma_adjust) {
> -        hwaddr node0_size = (nb_numa_nodes > 1) ? node_mem[0] : ram_size;
> -        spapr->rma_size = kvmppc_rma_size(node0_size, spapr->htab_shift);
> +        spapr->rma_size = kvmppc_rma_size(spapr_node0_size(),
> +                                          spapr->htab_shift);
>      }
>  }
> 
> @@ -1284,7 +1298,7 @@ static void ppc_spapr_init(MachineState *machine)
>      MemoryRegion *sysmem = get_system_memory();
>      MemoryRegion *ram = g_new(MemoryRegion, 1);
>      hwaddr rma_alloc_size;
> -    hwaddr node0_size = (nb_numa_nodes > 1) ? node_mem[0] : ram_size;
> +    hwaddr node0_size = spapr_node0_size();
>      uint32_t initrd_base = 0;
>      long kernel_size = 0, initrd_size = 0;
>      long load_limit, rtas_limit, fw_size;
> -- 
> 2.0.0
>