Re: [PATCH v2 15/18] mm/numa: Skip NUMA_NO_NODE and online nodes in numa_map_to_online_node()

From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
To: Dan Williams <dan.j.williams@intel.com>, linux-nvdimm@lists.01.org
Cc: peterz@infradead.org, dave.hansen@linux.intel.com, hch@lst.de,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	linux-acpi@vger.kernel.org
Subject: Re: [PATCH v2 15/18] mm/numa: Skip NUMA_NO_NODE and online nodes in numa_map_to_online_node()
Date: Mon, 18 Nov 2019 15:15:33 +0530	[thread overview]
Message-ID: <87wobxh60y.fsf@linux.ibm.com> (raw)
In-Reply-To: <157401275716.43284.13185549705765009174.stgit@dwillia2-desk3.amr.corp.intel.com>

Dan Williams <dan.j.williams@intel.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@linux.ibm.com>
>
> Reported-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
> Signed-off-by: Dan Williams <dan.j.williams@intel.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)) {
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