linux-kernel - Re: [PATCH v3 2/6] mm/numa: Skip NUMA_NO_NODE and online nodes in numa_map_to_online

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Date:   Tue, 21 Jan 2020 07:06:18 +0530
From:   "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
To:     Dan Williams <dan.j.williams@...el.com>, tglx@...utronix.de,
        mingo@...hat.com
Cc:     peterz@...radead.org, dave.hansen@...ux.intel.com, hch@....de,
        linux-kernel@...r.kernel.org, linux-nvdimm@...ts.01.org,
        x86@...nel.org
Subject: Re: [PATCH v3 2/6] 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.
>
> Reported-by: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
> Link: https://lore.kernel.org/r/157401275716.43284.13185549705765009174.stgit@dwillia2-desk3.amr.corp.intel.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 4cff069279f6..30d76db718bf 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)) {


The above if condition will always be true?

-aneesh