linux-kernel - Re: [PATCH v4 2/4] driver/base: remove register_mem_block_under_node

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Message-ID: <aCcPAV0RiVp0iq9W@kernel.org>
Date: Fri, 16 May 2025 13:10:09 +0300
From: Mike Rapoport <rppt@...nel.org>
To: Donet Tom <donettom@...ux.ibm.com>
Cc: David Hildenbrand <david@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Oscar Salvador <osalvador@...e.de>, Zi Yan <ziy@...dia.com>,
	Ritesh Harjani <ritesh.list@...il.com>, rafael@...nel.org,
	Danilo Krummrich <dakr@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Alison Schofield <alison.schofield@...el.com>,
	Yury Norov <yury.norov@...il.com>,
	Dave Jiang <dave.jiang@...el.com>
Subject: Re: [PATCH v4 2/4] driver/base: remove
 register_mem_block_under_node_early()

On Fri, May 16, 2025 at 03:19:52AM -0500, Donet Tom wrote:
> The function register_mem_block_under_node_early() is no longer used,
> as register_memory_blocks_under_node_early() now handles memory block
> registration during early boot.
> 
> Removed register_mem_block_under_node_early() and get_nid_for_pfn(),
> the latter was only used by the former.
> 
> Acked-by: David Hildenbrand <david@...hat.com>
> Acked-by: Zi Yan <ziy@...dia.com>
> Signed-off-by: Donet Tom <donettom@...ux.ibm.com>

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

> ---
> v3->v4
> 
> Added Acked-by tag
> 
> v3 - https://lore.kernel.org/all/b49ed289096643ff5b5fbedcf1d1c1be42845a74.1746250339.git.donettom@linux.ibm.com/
> v2 - https://lore.kernel.org/all/fbe1e0c7d91bf3fa9a64ff5d84b53ded1d0d5ac7.1745852397.git.donettom@linux.ibm.com/
> v1 - https://lore.kernel.org/all/50142a29010463f436dc5c4feb540e5de3bb09df.1744175097.git.donettom@linux.ibm.com/
> ---
>  drivers/base/node.c | 58 +--------------------------------------------
>  1 file changed, 1 insertion(+), 57 deletions(-)
> 
> diff --git a/drivers/base/node.c b/drivers/base/node.c
> index f8cafd8c8fb1..8a14ebcae3b9 100644
> --- a/drivers/base/node.c
> +++ b/drivers/base/node.c
> @@ -748,15 +748,6 @@ int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
>  }
>  
>  #ifdef CONFIG_MEMORY_HOTPLUG
> -static int __ref get_nid_for_pfn(unsigned long pfn)
> -{
> -#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
> -	if (system_state < SYSTEM_RUNNING)
> -		return early_pfn_to_nid(pfn);
> -#endif
> -	return pfn_to_nid(pfn);
> -}
> -
>  static void do_register_memory_block_under_node(int nid,
>  						struct memory_block *mem_blk,
>  						enum meminit_context context)
> @@ -783,46 +774,6 @@ static void do_register_memory_block_under_node(int nid,
>  				    ret);
>  }
>  
> -/* register memory section under specified node if it spans that node */
> -static int register_mem_block_under_node_early(struct memory_block *mem_blk,
> -					       void *arg)
> -{
> -	unsigned long memory_block_pfns = memory_block_size_bytes() / PAGE_SIZE;
> -	unsigned long start_pfn = section_nr_to_pfn(mem_blk->start_section_nr);
> -	unsigned long end_pfn = start_pfn + memory_block_pfns - 1;
> -	int nid = *(int *)arg;
> -	unsigned long pfn;
> -
> -	for (pfn = start_pfn; pfn <= end_pfn; pfn++) {
> -		int page_nid;
> -
> -		/*
> -		 * memory block could have several absent sections from start.
> -		 * skip pfn range from absent section
> -		 */
> -		if (!pfn_in_present_section(pfn)) {
> -			pfn = round_down(pfn + PAGES_PER_SECTION,
> -					 PAGES_PER_SECTION) - 1;
> -			continue;
> -		}
> -
> -		/*
> -		 * We need to check if page belongs to nid only at the boot
> -		 * case because node's ranges can be interleaved.
> -		 */
> -		page_nid = get_nid_for_pfn(pfn);
> -		if (page_nid < 0)
> -			continue;
> -		if (page_nid != nid)
> -			continue;
> -
> -		do_register_memory_block_under_node(nid, mem_blk, MEMINIT_EARLY);
> -		return 0;
> -	}
> -	/* mem section does not span the specified node */
> -	return 0;
> -}
> -
>  /*
>   * During hotplug we know that all pages in the memory block belong to the same
>   * node.
> @@ -892,15 +843,8 @@ void register_memory_blocks_under_node(int nid, unsigned long start_pfn,
>  				       unsigned long end_pfn,
>  				       enum meminit_context context)
>  {
> -	walk_memory_blocks_func_t func;
> -
> -	if (context == MEMINIT_HOTPLUG)
> -		func = register_mem_block_under_node_hotplug;
> -	else
> -		func = register_mem_block_under_node_early;
> -
>  	walk_memory_blocks(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn),
> -			   (void *)&nid, func);
> +			   (void *)&nid, register_mem_block_under_node_hotplug);
>  	return;
>  }
>  #endif /* CONFIG_MEMORY_HOTPLUG */
> -- 
> 2.43.5
> 

-- 
Sincerely yours,
Mike.