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Howlett" , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko Subject: Re: [PATCH 03/14] mm/Kconfig: make CONFIG_MEMORY_HOTPLUG depend on CONFIG_SPARSEMEM_VMEMMAP Message-ID: References: <20260317165652.99114-1-david@kernel.org> <20260317165652.99114-4-david@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260317165652.99114-4-david@kernel.org> X-Stat-Signature: gm4x1xjobd9waas6o8oq7hejtg4ggb3d X-Rspamd-Server: rspam09 X-Rspam-User: X-Rspamd-Queue-Id: BCA43C0006 X-HE-Tag: 1773820516-376760 X-HE-Meta: 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 HZ+Deof8 adhdgYhJQzuDX/owLkSouDDeZodk3UJnvySGQAfBPSvuqa0n7s/owqT0eUsER0zL5gbuCk7tgEG0/B829B2cAWSdceZjpw+4ub0ar6I95TUUCDLyZ13QBMAEjHAGeThacpRMQYZGAEIOV9tp2E4tdqSBAu6oBU5IZq1rWmFjV5NsDAdz2VKcVvi83Z5R3hOmcoGwApd9eDRNIHj4Q2YnIkag+jd9Z4CEqJmxlIKj+tCnxaohIN6mZU9IkVo6twiL00qYASR1ro8sVElr9SuDxsaFPHw5F02x4tQUFZO8JclDwnTo36U64fZEwJiCc9hF1UbbJ3403B5tdORg= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Mar 17, 2026 at 05:56:41PM +0100, David Hildenbrand (Arm) wrote: > 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. > > Signed-off-by: David Hildenbrand (Arm) Reviewed-by: Mike Rapoport (Microsoft) > --- > 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 > -- Sincerely yours, Mike.