linux-kernel - Re: [PATCH v2 15/18] mm/numa: Skip NUMA_NO_NODE and online nodes in numa_map_to_online

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Date:   Mon, 18 Nov 2019 15:15:33 +0530
From:   "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
To:     Dan Williams <dan.j.williams@...el.com>, linux-nvdimm@...ts.01.org
Cc:     peterz@...radead.org, vishal.l.verma@...el.com,
        dave.hansen@...ux.intel.com, hch@....de,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-acpi@...r.kernel.org
Subject: Re: [PATCH v2 15/18] mm/numa: Skip NUMA_NO_NODE and online nodes in numa_map_to_online_node()

Dan Williams <dan.j.williams@...el.com> writes:

> Update numa_map_to_online_node() to stop falling back to numa node 0
> when the input is NUMA_NO_NODE. Also, skip the lookup if @node is
> online. This makes the routine compatible with other arch node mapping
> routines.

Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
>
> Reported-by: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> ---
>  mm/mempolicy.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/mm/mempolicy.c b/mm/mempolicy.c
> index e2d8dd21ce9d..d618121bcc17 100644
> --- a/mm/mempolicy.c
> +++ b/mm/mempolicy.c
> @@ -137,8 +137,8 @@ int numa_map_to_online_node(int node)
>  {
>  	int min_node;
>  
> -	if (node == NUMA_NO_NODE)
> -		node = 0;
> +	if (node == NUMA_NO_NODE || node_online(node))
> +		return node;
>  
>  	min_node = node;
>  	if (!node_online(node)) {