From: "David Hildenbrand (Arm)" <david@kernel.org>
To: linux-kernel@vger.kernel.org
Cc: 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>,
Sidhartha Kumar <sidhartha.kumar@oracle.com>,
linux-mm@kvack.org, linux-cxl@vger.kernel.org,
linux-riscv@lists.infradead.org,
"David Hildenbrand (Arm)" <david@kernel.org>
Subject: [PATCH v2 04/15] mm/Kconfig: make CONFIG_MEMORY_HOTPLUG depend on CONFIG_SPARSEMEM_VMEMMAP
Date: Fri, 20 Mar 2026 23:13:36 +0100 [thread overview]
Message-ID: <20260320-sparsemem_cleanups-v2-4-096addc8800d@kernel.org> (raw)
In-Reply-To: <20260320-sparsemem_cleanups-v2-0-096addc8800d@kernel.org>
Ever since commit f8f03eb5f0f9 ("mm: stop making SPARSEMEM_VMEMMAP
user-selectable"), an architecture that supports CONFIG_SPARSEMEM_VMEMMAP
(by selecting SPARSEMEM_VMEMMAP_ENABLE) can no longer enable
CONFIG_SPARSEMEM without CONFIG_SPARSEMEM_VMEMMAP.
Right now, CONFIG_MEMORY_HOTPLUG is guarded by CONFIG_SPARSEMEM.
However, CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG is only enabled by
* arm64: which selects SPARSEMEM_VMEMMAP_ENABLE
* loongarch: which selects SPARSEMEM_VMEMMAP_ENABLE
* powerpc (64bit): which selects SPARSEMEM_VMEMMAP_ENABLE
* riscv (64bit): which selects SPARSEMEM_VMEMMAP_ENABLE
* s390 with SPARSEMEM: which selects SPARSEMEM_VMEMMAP_ENABLE
* x86 (64bit): which selects SPARSEMEM_VMEMMAP_ENABLE
So, we can make CONFIG_MEMORY_HOTPLUG depend on CONFIG_SPARSEMEM_VMEMMAP
without affecting any setups.
Reviewed-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Signed-off-by: David Hildenbrand (Arm) <david@kernel.org>
---
mm/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/Kconfig b/mm/Kconfig
index ebd8ea353687..c012944938a7 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -472,7 +472,7 @@ config ARCH_ENABLE_MEMORY_HOTREMOVE
menuconfig MEMORY_HOTPLUG
bool "Memory hotplug"
select MEMORY_ISOLATION
- depends on SPARSEMEM
+ depends on SPARSEMEM_VMEMMAP
depends on ARCH_ENABLE_MEMORY_HOTPLUG
depends on 64BIT
select NUMA_KEEP_MEMINFO if NUMA
--
2.43.0
next prev parent reply other threads:[~2026-03-20 22:14 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-20 22:13 [PATCH v2 00/15] mm: memory hot(un)plug and SPARSEMEM cleanups David Hildenbrand (Arm)
2026-03-20 22:13 ` [PATCH v2 01/15] mm/memory_hotplug: fix possible race in scan_movable_pages() David Hildenbrand (Arm)
2026-03-23 13:26 ` Lorenzo Stoakes (Oracle)
2026-03-23 13:40 ` David Hildenbrand (Arm)
2026-03-23 14:00 ` Lorenzo Stoakes (Oracle)
2026-03-20 22:13 ` [PATCH v2 02/15] mm/memory_hotplug: remove for_each_valid_pfn() usage David Hildenbrand (Arm)
2026-03-20 22:13 ` [PATCH v2 03/15] mm/sparse: remove WARN_ONs from (online|offline)_mem_sections() David Hildenbrand (Arm)
2026-03-20 22:13 ` David Hildenbrand (Arm) [this message]
2026-03-20 22:13 ` [PATCH v2 05/15] mm/memory_hotplug: simplify check_pfn_span() David Hildenbrand (Arm)
2026-03-20 22:13 ` [PATCH v2 06/15] mm/sparse: remove !CONFIG_SPARSEMEM_VMEMMAP leftovers for CONFIG_MEMORY_HOTPLUG David Hildenbrand (Arm)
2026-03-20 22:13 ` [PATCH v2 07/15] mm/bootmem_info: remove handling for !CONFIG_SPARSEMEM_VMEMMAP David Hildenbrand (Arm)
2026-03-20 22:13 ` [PATCH v2 08/15] mm/bootmem_info: avoid using sparse_decode_mem_map() David Hildenbrand (Arm)
2026-03-20 22:13 ` [PATCH v2 09/15] mm/sparse: remove sparse_decode_mem_map() David Hildenbrand (Arm)
2026-03-20 22:13 ` [PATCH v2 10/15] mm/sparse: remove CONFIG_MEMORY_HOTPLUG-specific usemap allocation handling David Hildenbrand (Arm)
2026-03-20 22:13 ` [PATCH v2 11/15] mm: prepare to move subsection_map_init() to mm/sparse-vmemmap.c David Hildenbrand (Arm)
2026-03-20 22:13 ` [PATCH v2 12/15] mm/sparse: drop set_section_nid() from sparse_add_section() David Hildenbrand (Arm)
2026-03-20 22:13 ` [PATCH v2 13/15] mm/sparse: move sparse_init_one_section() to internal.h David Hildenbrand (Arm)
2026-03-23 8:49 ` David Hildenbrand (Arm)
2026-03-20 22:13 ` [PATCH v2 14/15] mm/sparse: move __section_mark_present() " David Hildenbrand (Arm)
2026-03-20 22:13 ` [PATCH v2 15/15] mm/sparse: move memory hotplug bits to sparse-vmemmap.c David Hildenbrand (Arm)
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