Re: [Xen-devel] [RFC PATCH v3 07/24] ARM: NUMA: Add existing ARM numa code under CONFIG_NUMA

[Julien Grall <julien.grall@xxxxxxx>]

Hi Vijay,

On 18/07/17 12:41, vijay.kilari@xxxxxxxxx wrote:
> From: Vijaya Kumar K <Vijaya.Kumar@xxxxxxxxxx>
>
> Right now CONFIG_NUMA is not enabled for ARM and
> existing code in asm-arm/numa.h is for !CONFIG_NUMA.
> Hence put this code under #ifndef CONFIG_NUMA.
>
> This help to make this changes work when CONFIG_NUMA
> is not enabled. Though CONFIG_NUMA is enabled by default,
> manually disabling this option is possible and compilation
> should go through. Hence kept the these changes under
> !CONFIG_NUMA.
This is still no true. It is not possible to disable CONFIG_NUMA from 
the Kconfig unless you hack it (just tried it)...
As I said on v2, if you always enable NUMA why should we add code in Xen 
that get rotten? Either you allow NUMA to be disabled by the user or you 
drop this code.
> Signed-off-by: Vijaya Kumar K <Vijaya.Kumar@xxxxxxxxxx>
> ---
> v3: - Dropped NODE_SHIFT define
> ---
>  xen/include/asm-arm/numa.h | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/xen/include/asm-arm/numa.h b/xen/include/asm-arm/numa.h
> index 53f99af..7f00a36 100644
> --- a/xen/include/asm-arm/numa.h
> +++ b/xen/include/asm-arm/numa.h
> @@ -3,6 +3,7 @@
>
>  typedef uint8_t nodeid_t;
>
> +#ifndef CONFIG_NUMA
>  /* Fake one node for now. See also node_online_map. */
>  #define cpu_to_node(cpu) 0
>  #define node_to_cpumask(node)   (cpu_online_map)
> @@ -16,6 +17,7 @@ static inline __attribute__((pure)) nodeid_t 
> phys_to_nid(paddr_t addr)
>  #define node_spanned_pages(nid) (total_pages)
>  #define node_start_pfn(nid) (pdx_to_pfn(frametable_base_pdx))
>  #define __node_distance(a, b) (20)
> +#endif /* CONFIG_NUMA */
>
>  static inline unsigned int arch_get_dma_bitsize(void)
>  {
Cheers,

--
Julien Grall

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