linux-kernel - Re: [PATCH v2] mm: numa_clear_kernel_node_hotplug: Add NUMA_NO

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Message-ID: <162ff655-0c55-4aa8-9ca2-3f818a1233cd@arm.com>
Date: Wed, 16 Oct 2024 18:07:36 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>, linux-mm@...ck.org,
 Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, yuji2.ishikawa@...hiba.co.jp,
 Mike Rapoport <rppt@...nel.org>
Subject: Re: [PATCH v2] mm: numa_clear_kernel_node_hotplug: Add NUMA_NO_NODE
 check for node id



On 10/16/24 14:51, Nobuhiro Iwamatsu wrote:
> The acquired memory blocks for reserved may include blocks outside of
> memory management. In this case, the nid variable is set to NUMA_NO_NODE
> (-1), so an error occurs in node_set().
> This adds a check using numa_valid_node() to numa_clear_kernel_node_hotplug()
> that skips node_set() when nid is set to NUMA_NO_NODE.
> 
> Fixes: 87482708210f ("mm: introduce numa_memblks")
> Cc: Mike Rapoport (Microsoft) <rppt@...nel.org>
> Reviewed-by: Mike Rapoport (Microsoft) <rppt@...nel.org>
> Suggested-by: Yuji Ishikawa <yuji2.ishikawa@...hiba.co.jp>
> Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>
> ---
>  mm/numa_memblks.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> v2:
>   - Use numa_valid_node() instead of check.
>   - Add Reviewed-by: Mike Rapoport (Microsoft) <rppt@...nel.org>
>   - Update description.
>   - Drop RFC from subject.
> 
> diff --git a/mm/numa_memblks.c b/mm/numa_memblks.c
> index be52b93a9c58..a3877e9bc878 100644
> --- a/mm/numa_memblks.c
> +++ b/mm/numa_memblks.c
> @@ -349,7 +349,7 @@ static void __init numa_clear_kernel_node_hotplug(void)
>  	for_each_reserved_mem_region(mb_region) {
>  		int nid = memblock_get_region_node(mb_region);
>  
> -		if (nid != MAX_NUMNODES)
> +		if (numa_valid_node(nid))
>  			node_set(nid, reserved_nodemask);
>  	}
>  

Reviewed-by: Anshuman Khandual <anshuman.khandual@....com>