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SubjectRe: [PATCH V13 2/4] powerpc/vphn: Improve recognition of PRRN/VPHN
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On 09/01/2017 10:48 AM, Michael Bringmann wrote:
> powerpc/vphn: On Power systems with shared configurations of CPUs
> and memory, there are some issues with the association of additional
> CPUs and memory to nodes when hot-adding resources. This patch
> updates the initialization checks to independently recognize PRRN
> or VPHN support.
>
> Signed-off-by: Michael Bringmann <mwb@linux.vnet.ibm.com>
> ---
> Changes in V13:
> -- Split patch to improve review
> ---
> arch/powerpc/mm/numa.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
> index 312f6ee..c08d736 100644
> --- a/arch/powerpc/mm/numa.c
> +++ b/arch/powerpc/mm/numa.c
> @@ -1543,7 +1543,8 @@ int start_topology_update(void)
> rc = of_reconfig_notifier_register(&dt_update_nb);
> #endif
> }
> - } else if (firmware_has_feature(FW_FEATURE_VPHN) &&
> + }
> + if (firmware_has_feature(FW_FEATURE_VPHN) &&
> lppaca_shared_proc(get_lppaca())) {
> if (!vphn_enabled) {
> vphn_enabled = 1;

In patch 1/4, you removed the setting of prrn_enabled and vphn_enabled
to 0. It seems like that update would be part of this patch.

-Nathan

> @@ -1568,7 +1569,8 @@ int stop_topology_update(void)
> #ifdef CONFIG_SMP
> rc = of_reconfig_notifier_unregister(&dt_update_nb);
> #endif
> - } else if (vphn_enabled) {
> + }
> + if (vphn_enabled) {
> vphn_enabled = 0;> rc = del_timer_sync(&topology_timer);
> }
>

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