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

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Message-ID: <Zw91Ynr53eGwj91r@kernel.org>
Date: Wed, 16 Oct 2024 11:12:18 +0300
From: Mike Rapoport <rppt@...nel.org>
To: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>
Cc: linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, yuji2.ishikawa@...hiba.co.jp
Subject: Re: [PATCH RFC] mm: numa_clear_kernel_node_hotplug: Add NUMA_NO_NODE
 check for node id

On Wed, Oct 16, 2024 at 02:37:10PM +0900, 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 to numa_clear_kernel_node_hotplug that skips node_set
> when nid is set to NUMA_NO_NODE.
> 
> Fixes: 87482708210f ("mm: introduce numa_memblks")
> Suggested-by: Yuji Ishikawa <yuji2.ishikawa@...hiba.co.jp>
> Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>
> Cc: Mike Rapoport (Microsoft) <rppt@...nel.org>
> ---
>  mm/numa_memblks.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/numa_memblks.c b/mm/numa_memblks.c
> index be52b93a9c58..b982f9260872 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 (nid != NUMA_NO_NODE && nid != MAX_NUMNODES)

We have numa_valid_node() check for this, please use that.
Otherwise

Reviewed-by: Mike Rapoport (Microsoft) <rppt@...nel.org>

>  			node_set(nid, reserved_nodemask);
>  	}
>  
> -- 
> 2.45.2
> 
> 

-- 
Sincerely yours,
Mike.