From nobody Mon Apr 6 09:10:45 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1A683341065; Fri, 20 Mar 2026 22:14:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774044841; cv=none; b=mGBcWTXEPQO2gmBHi44Y9ZmhnJ3DhJ60PsjV/dD9h+TBM9c9cG45JKP7Iov0cJumInL0KifqcddWhANQY9U18XwS9hdhXaQ+Rt9H2zAwqebSyyibTRW/9Vvd7tzlm46pzWUn5cA2N7UZnKhCkY35k4wUpN+bTm/TiAWglLYZg34= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774044841; c=relaxed/simple; bh=mvXhiGTn6tZZYnNOOoiRbg2GgcaMPiyLXwyjxmdxo84=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=ttEzB9UWMy2kWm7lbj1FdgMW9kHNgrDd3CLG/dkvMHytcM0cnxN2be9yh1dOUw8105eRliI4Snkr85x8u6cONMTjq1RwKdg+9ImXJh3imHtMs/6/8bXjNOYohmNjRSabGOJdPfTU3mY2uFBMXCGZXmbskwBtPBC4dFU95Qg3VaU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=X/uB2w7D; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="X/uB2w7D" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 22BC5C2BC87; Fri, 20 Mar 2026 22:13:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774044840; bh=mvXhiGTn6tZZYnNOOoiRbg2GgcaMPiyLXwyjxmdxo84=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=X/uB2w7DSbxaqWWZI0SFouAEqRYt5ziW1QewNaYsFL+YJCSIra6vwkHxw1G9GGCh4 BIg7cd7GsHXYGOKUNs0MzTHjHG60jQ69wHz78GZiVzLl9CYVKK8mKlaJBjYPupxasS g+bH6a1n9UMg+IiOGJihFzUSK7KfYpQoRfoiR5xltvNtvoFnAacVxiUXKk85xWL8c9 muE+/XC1RcriPyCEgQuzM4jbHkE9K1Cv3yzKRDknP/UJEsuMIMFvejFsVGjnmVpp4O pbmnmWeUm1R8FQmqFTejFLSSs151sXs6nnngVkaakFF4+Yn2aN1kiPBhn3e/pwFWuy w+3VzFUlJqhAg== From: "David Hildenbrand (Arm)" Date: Fri, 20 Mar 2026 23:13:36 +0100 Subject: [PATCH v2 04/15] mm/Kconfig: make CONFIG_MEMORY_HOTPLUG depend on CONFIG_SPARSEMEM_VMEMMAP Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260320-sparsemem_cleanups-v2-4-096addc8800d@kernel.org> References: <20260320-sparsemem_cleanups-v2-0-096addc8800d@kernel.org> In-Reply-To: <20260320-sparsemem_cleanups-v2-0-096addc8800d@kernel.org> To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Oscar Salvador , Axel Rasmussen , Yuanchu Xie , Wei Xu , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Sidhartha Kumar , linux-mm@kvack.org, linux-cxl@vger.kernel.org, linux-riscv@lists.infradead.org, "David Hildenbrand (Arm)" X-Mailer: b4 0.13.0 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) Reviewed-by: Mike Rapoport (Microsoft) Signed-off-by: David Hildenbrand (Arm) --- 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 --=20 2.43.0