From nobody Mon Apr 6 16:29:34 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 69EBE355F4A; Thu, 19 Mar 2026 08:20:29 +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=1773908429; cv=none; b=dqNDRORXBXte61yUcY9lwDghaJ37opJr9JwOg6Koi96HVWWW9g7NDUISHQ+vBSU7cgq0SchdD0IbKtRpdAGKGNQ+wpVyRQ8X9CXv5oapCSVqCCPL07eyMeC2gqV0NngPEr83xRV2R0WtgORSJ3ym48bz7f7YW/LxRkLXhrWk40Y= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773908429; c=relaxed/simple; bh=klUwCUSCdgbV1tZfxsphb/dv7F/GAnfibv0j756H5s0=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Aq+x8oSyL9HMb7SiQ5xvxRgHw14klhSWzN135E0+1FwBMaVYHkwzENtLRd4u08e+zlmaOIqGYlZqjs6ijkL7W7aZn+JaqS1AGVQydSownm3jQu6K0EPr/6Vb84mXjAHGLbZW/fo/hUjXeE9xweFIh2Yqzvux4CpF05TnSizl/mE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Ncs5z7CT; 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="Ncs5z7CT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CB51CC19424; Thu, 19 Mar 2026 08:20:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773908429; bh=klUwCUSCdgbV1tZfxsphb/dv7F/GAnfibv0j756H5s0=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=Ncs5z7CTqhJIhBNQChRHYmFCx/Gw02cZqph0yX7SmRTDgJm2DLn2WyIwLTWtTffwk FlIgvvlw2O7wMiIl4sIdqv1PPMfQyjp+lEiO6kSyoZuT8mUfKTQ58kd1Xm4OxGQKdT p9pxFkdizBdGPWKy4V3zTtFizqjONEz3nDGPvqv0/GEHaaK8ekD7oZsfIu7ePeci/k AkZs2QIi6CuvEPo3LuCzwztW4AlExyadOcFwBMGWiJ1FQkRF+eqDtaMkeokzzcKOUb dymhmxUCovijWR/aJHZBLNT2MH6nnIGjbCu14vm9SHNCQW3yrPxcgl7Y5pxQ2yt0YG ENQ7VsLW8LzDQ== From: "David Hildenbrand (Arm)" Date: Thu, 19 Mar 2026 09:19:40 +0100 Subject: [PATCH 1/2] mm: remove CONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE 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: <20260319-config_migration-v1-1-42270124966f@kernel.org> References: <20260319-config_migration-v1-0-42270124966f@kernel.org> In-Reply-To: <20260319-config_migration-v1-0-42270124966f@kernel.org> To: linux-kernel@vger.kernel.org Cc: Catalin Marinas , Will Deacon , Huacai Chen , WANG Xuerui , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , "Christophe Leroy (CS GROUP)" , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Andrew Morton , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Zi Yan , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , Sebastian Andrzej Siewior , Clark Williams , Steven Rostedt , linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-mm@kvack.org, linux-rt-devel@lists.linux.dev, "David Hildenbrand (Arm)" X-Mailer: b4 0.13.0 All architectures that select CONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE also select CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG. So we can just remove CONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE. For CONFIG_MIGRATION, make it depend on CONFIG_MEMORY_HOTREMOVE instead, and make CONFIG_MEMORY_HOTREMOVE select CONFIG_MIGRATION (just like CONFIG_CMA and CONFIG_COMPACTION already do). We'll clean up CONFIG_MIGRATION next. Signed-off-by: David Hildenbrand (Arm) Acked-by: Zi Yan Reviewed-by: Gregory Price Reviewed-by: Joshua Hahn Reviewed-by: Lorenzo Stoakes (Oracle) Reviewed-by: Mike Rapoport (Microsoft) --- arch/arm64/Kconfig | 1 - arch/loongarch/Kconfig | 1 - arch/powerpc/Kconfig | 1 - arch/riscv/Kconfig | 1 - arch/s390/Kconfig | 1 - arch/x86/Kconfig | 1 - mm/Kconfig | 9 +++------ 7 files changed, 3 insertions(+), 12 deletions(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 38dba5f7e4d2..bcd9f5bc66e2 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -16,7 +16,6 @@ config ARM64 select ARCH_BINFMT_ELF_STATE select ARCH_ENABLE_HUGEPAGE_MIGRATION if HUGETLB_PAGE && MIGRATION select ARCH_ENABLE_MEMORY_HOTPLUG - select ARCH_ENABLE_MEMORY_HOTREMOVE select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2 select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE select ARCH_HAS_CACHE_LINE_SIZE diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig index d211c6572b0a..dbf65ad512f1 100644 --- a/arch/loongarch/Kconfig +++ b/arch/loongarch/Kconfig @@ -12,7 +12,6 @@ config LOONGARCH select ARCH_NEEDS_DEFER_KASAN select ARCH_DISABLE_KASAN_INLINE select ARCH_ENABLE_MEMORY_HOTPLUG - select ARCH_ENABLE_MEMORY_HOTREMOVE select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI select ARCH_HAS_CPU_FINALIZE_INIT diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index ad7a2fe63a2a..9f3417b75b2b 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -126,7 +126,6 @@ config PPC select ARCH_DISABLE_KASAN_INLINE if PPC_RADIX_MMU select ARCH_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE select ARCH_ENABLE_MEMORY_HOTPLUG - select ARCH_ENABLE_MEMORY_HOTREMOVE select ARCH_HAS_COPY_MC if PPC64 select ARCH_HAS_CURRENT_STACK_POINTER select ARCH_HAS_DEBUG_VIRTUAL diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 90c531e6abf5..61a9d8d3ea64 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -21,7 +21,6 @@ config RISCV select ARCH_DMA_DEFAULT_COHERENT select ARCH_ENABLE_HUGEPAGE_MIGRATION if HUGETLB_PAGE && MIGRATION select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM_VMEMMAP - select ARCH_ENABLE_MEMORY_HOTREMOVE if MEMORY_HOTPLUG select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2 select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE select ARCH_HAS_BINFMT_FLAT diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index edc927d9e85a..d01800962d84 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -85,7 +85,6 @@ config S390 select ARCH_32BIT_USTAT_F_TINODE select ARCH_CORRECT_STACKTRACE_ON_KRETPROBE select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM - select ARCH_ENABLE_MEMORY_HOTREMOVE select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2 select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE select ARCH_HAS_CC_CAN_LINK diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index e2df1b147184..c290fe363f27 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -69,7 +69,6 @@ config X86 select ARCH_CORRECT_STACKTRACE_ON_KRETPROBE select ARCH_ENABLE_HUGEPAGE_MIGRATION if X86_64 && HUGETLB_PAGE && MIGRAT= ION select ARCH_ENABLE_MEMORY_HOTPLUG if X86_64 - select ARCH_ENABLE_MEMORY_HOTREMOVE if MEMORY_HOTPLUG select ARCH_ENABLE_SPLIT_PMD_PTLOCK if (PGTABLE_LEVELS > 2) && (X86_64 ||= X86_PAE) select ARCH_ENABLE_THP_MIGRATION if X86_64 && TRANSPARENT_HUGEPAGE select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI diff --git a/mm/Kconfig b/mm/Kconfig index c012944938a7..b2e21d873d3f 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -465,9 +465,6 @@ config HAVE_BOOTMEM_INFO_NODE config ARCH_ENABLE_MEMORY_HOTPLUG bool =20 -config ARCH_ENABLE_MEMORY_HOTREMOVE - bool - # eventually, we can have this option just 'select SPARSEMEM' menuconfig MEMORY_HOTPLUG bool "Memory hotplug" @@ -540,8 +537,8 @@ endchoice config MEMORY_HOTREMOVE bool "Allow for memory hot remove" select HAVE_BOOTMEM_INFO_NODE if (X86_64 || PPC64) - depends on MEMORY_HOTPLUG && ARCH_ENABLE_MEMORY_HOTREMOVE - depends on MIGRATION + depends on MEMORY_HOTPLUG + select MIGRATION =20 config MHP_MEMMAP_ON_MEMORY def_bool y @@ -636,7 +633,7 @@ config PAGE_REPORTING config MIGRATION bool "Page migration" default y - depends on (NUMA || ARCH_ENABLE_MEMORY_HOTREMOVE || COMPACTION || CMA) &&= MMU + depends on (NUMA || MEMORY_HOTREMOVE || COMPACTION || CMA) && MMU help Allows the migration of the physical location of pages of processes while the virtual addresses are not changed. This is useful in --=20 2.43.0