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From: "David Hildenbrand (Arm)" <david@kernel.org>
To: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org, linux-cxl@vger.kernel.org,
	"David Hildenbrand (Arm)" <david@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Oscar Salvador <osalvador@suse.de>,
	Axel Rasmussen <axelrasmussen@google.com>,
	Yuanchu Xie <yuanchu@google.com>, Wei Xu <weixugc@google.com>,
	Lorenzo Stoakes <ljs@kernel.org>,
	"Liam R. Howlett" <Liam.Howlett@oracle.com>,
	Vlastimil Babka <vbabka@kernel.org>,
	Mike Rapoport <rppt@kernel.org>,
	Suren Baghdasaryan <surenb@google.com>,
	Michal Hocko <mhocko@suse.com>
Subject: [PATCH 11/14] mm/sparse: drop set_section_nid() from sparse_add_section()
Date: Tue, 17 Mar 2026 17:56:49 +0100	[thread overview]
Message-ID: <20260317165652.99114-12-david@kernel.org> (raw)
In-Reply-To: <20260317165652.99114-1-david@kernel.org>

CONFIG_MEMORY_HOTPLUG is CONFIG_SPARSEMEM_VMEMMAP-only. And
CONFIG_SPARSEMEM_VMEMMAP implies that NODE_NOT_IN_PAGE_FLAGS cannot be set:
see include/linux/page-flags-layout.h

	...
	#elif defined(CONFIG_SPARSEMEM_VMEMMAP)
	#error "Vmemmap: No space for nodes field in page flags"
	...

So let's remove the set_section_nid() call to prepare for moving
CONFIG_MEMORY_HOTPLUG to mm/sparse-vmemmap.c

Signed-off-by: David Hildenbrand (Arm) <david@kernel.org>
---
 mm/sparse.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/mm/sparse.c b/mm/sparse.c
index 7b0bfea73a9b..b5a2de43ac40 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -769,7 +769,6 @@ int __meminit sparse_add_section(int nid, unsigned long start_pfn,
 	page_init_poison(memmap, sizeof(struct page) * nr_pages);
 
 	ms = __nr_to_section(section_nr);
-	set_section_nid(section_nr, nid);
 	__section_mark_present(ms, section_nr);
 
 	/* Align memmap to section boundary in the subsection case */
-- 
2.43.0



  parent reply	other threads:[~2026-03-17 16:57 UTC|newest]

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-03-17 16:56 [PATCH 00/14] mm: memory hot(un)plug and SPARSEMEM cleanups David Hildenbrand (Arm)
2026-03-17 16:56 ` [PATCH 01/14] mm/memory_hotplug: remove for_each_valid_pfn() usage David Hildenbrand (Arm)
2026-03-17 17:19   ` Lorenzo Stoakes (Oracle)
2026-03-17 20:30   ` David Hildenbrand (Arm)
2026-03-18  7:51   ` Mike Rapoport
2026-03-17 16:56 ` [PATCH 02/14] mm/sparse: remove WARN_ONs from (online|offline)_mem_sections() David Hildenbrand (Arm)
2026-03-17 17:21   ` Lorenzo Stoakes (Oracle)
2026-03-18  7:53   ` Mike Rapoport
2026-03-17 16:56 ` [PATCH 03/14] mm/Kconfig: make CONFIG_MEMORY_HOTPLUG depend on CONFIG_SPARSEMEM_VMEMMAP David Hildenbrand (Arm)
2026-03-17 17:22   ` Lorenzo Stoakes (Oracle)
2026-03-18  7:55   ` Mike Rapoport
2026-03-17 16:56 ` [PATCH 04/14] mm/memory_hotplug: simplify check_pfn_span() David Hildenbrand (Arm)
2026-03-17 17:24   ` Lorenzo Stoakes (Oracle)
2026-03-18  7:56   ` Mike Rapoport
2026-03-17 16:56 ` [PATCH 05/14] mm/sparse: remove !CONFIG_SPARSEMEM_VMEMMAP leftovers for CONFIG_MEMORY_HOTPLUG David Hildenbrand (Arm)
2026-03-17 17:54   ` Lorenzo Stoakes (Oracle)
2026-03-18  7:58   ` Mike Rapoport
2026-03-17 16:56 ` [PATCH 06/14] mm/bootmem_info: remove handling for !CONFIG_SPARSEMEM_VMEMMAP David Hildenbrand (Arm)
2026-03-17 17:49   ` Lorenzo Stoakes (Oracle)
2026-03-18  8:15   ` Mike Rapoport
2026-03-20 18:37     ` David Hildenbrand (Arm)
2026-03-17 16:56 ` [PATCH 07/14] mm/bootmem_info: avoid using sparse_decode_mem_map() David Hildenbrand (Arm)
2026-03-17 18:02   ` Lorenzo Stoakes (Oracle)
2026-03-18  8:20   ` Mike Rapoport
2026-03-17 16:56 ` [PATCH 08/14] mm/sparse: remove sparse_decode_mem_map() David Hildenbrand (Arm)
2026-03-17 19:25   ` Lorenzo Stoakes (Oracle)
2026-03-18  8:20   ` Mike Rapoport
2026-03-17 16:56 ` [PATCH 09/14] mm/sparse: remove CONFIG_MEMORY_HOTPLUG-specific usemap allocation handling David Hildenbrand (Arm)
2026-03-17 19:48   ` Lorenzo Stoakes (Oracle)
2026-03-20 18:49     ` David Hildenbrand (Arm)
2026-03-20 18:58       ` David Hildenbrand (Arm)
2026-03-18  8:34   ` Mike Rapoport
2026-03-17 16:56 ` [PATCH 10/14] mm: prepare to move subsection_map_init() to mm/sparse-vmemmap.c David Hildenbrand (Arm)
2026-03-17 19:51   ` Lorenzo Stoakes (Oracle)
2026-03-20 18:59     ` David Hildenbrand (Arm)
2026-03-18  8:46   ` Mike Rapoport
2026-03-20 19:01     ` David Hildenbrand (Arm)
2026-03-17 16:56 ` David Hildenbrand (Arm) [this message]
2026-03-17 19:55   ` [PATCH 11/14] mm/sparse: drop set_section_nid() from sparse_add_section() Lorenzo Stoakes (Oracle)
2026-03-18  8:50   ` Mike Rapoport
2026-03-17 16:56 ` [PATCH 12/14] mm/sparse: move sparse_init_one_section() to internal.h David Hildenbrand (Arm)
2026-03-17 20:00   ` Lorenzo Stoakes (Oracle)
2026-03-18  8:54   ` Mike Rapoport
2026-03-17 16:56 ` [PATCH 13/14] mm/sparse: move __section_mark_present() " David Hildenbrand (Arm)
2026-03-17 20:01   ` Lorenzo Stoakes (Oracle)
2026-03-18  8:56   ` Mike Rapoport
2026-03-20 19:06     ` David Hildenbrand (Arm)
2026-03-17 16:56 ` [PATCH 14/14] mm/sparse: move memory hotplug bits to sparse-vmemmap.c David Hildenbrand (Arm)
2026-03-17 20:09   ` Lorenzo Stoakes (Oracle)
2026-03-20 19:07     ` David Hildenbrand (Arm)
2026-03-18  8:57   ` Mike Rapoport
2026-03-18 19:51 ` [PATCH 00/14] mm: memory hot(un)plug and SPARSEMEM cleanups Andrew Morton
2026-03-18 19:54   ` David Hildenbrand (Arm)

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