[PATCH v6 3/4] arm64/arm, numa, dt: adding numa dt binding implementation for arm64 platforms

[Ming Lei]

On Tue, Oct 20, 2015 at 6:45 PM, Ganapatrao Kulkarni
<gkulkarni at caviumnetworks.com> wrote:
> Adding numa dt binding support for arm64 based platforms.
> dt node parsing for numa topology is done using device property
> proximity and device node distance-map.
>
> Reviewed-by: Robert Richter <rrichter at cavium.com>
> Signed-off-by: Ganapatrao Kulkarni <gkulkarni at caviumnetworks.com>
> ---
>  arch/arm64/Kconfig            |  10 ++
>  arch/arm64/include/asm/numa.h |  10 ++
>  arch/arm64/kernel/Makefile    |   1 +
>  arch/arm64/kernel/of_numa.c   | 221 ++++++++++++++++++++++++++++++++++++++++++
>  arch/arm64/kernel/smp.c       |   1 +
>  arch/arm64/mm/numa.c          |  10 +-
>  6 files changed, 252 insertions(+), 1 deletion(-)
>  create mode 100644 arch/arm64/kernel/of_numa.c
>
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 0f9cdc7..6cf8d20 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -426,6 +426,16 @@ config NUMA
>           local memory controller of the CPU and add some more
>           NUMA awareness to the kernel.
>
> +config OF_NUMA
> +       bool "Device Tree NUMA support"
> +       depends on NUMA
> +       depends on OF
> +       default y
> +       help
> +         Enable Device Tree NUMA support.
> +         This enables the numa mapping of cpu, memory, io and
> +         inter node distances using dt bindings.

Enabling the above config option can cause numa_init() warning in
numa-less arm64 system, please see the following report:

          https://bugs.launchpad.net/bugs/1509221

Thanks,