From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id CB57F109022E for ; Thu, 19 Mar 2026 14:11:51 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 33BD26B04CC; Thu, 19 Mar 2026 10:11:51 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 2EC936B04CE; Thu, 19 Mar 2026 10:11:51 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 202D26B04CF; Thu, 19 Mar 2026 10:11:51 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id 11F446B04CC for ; Thu, 19 Mar 2026 10:11:51 -0400 (EDT) Received: from smtpin05.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id 9B19CC1FF1 for ; Thu, 19 Mar 2026 14:11:50 +0000 (UTC) X-FDA: 84563001180.05.4402500 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf10.hostedemail.com (Postfix) with ESMTP id C5EB7C0006 for ; Thu, 19 Mar 2026 14:11:48 +0000 (UTC) Authentication-Results: imf10.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=UerHPcIh; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf10.hostedemail.com: domain of ljs@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=ljs@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1773929508; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=62uEef/BkeK/5loUdRkhgtOa4Jww3WVIsDAkK87TFQ4=; b=S+AAJvlDB8tcjKS7GPNL/XOvu6/5nljqiL4t5fT/w1xy7p5JYV6LkjbbhtP9jWEG9OKQoE cdm0BaaiT4XGPqDdpLfhWQMIR13L5IUoMAhqE/mrd25xgSj8LpCKhtW793awkr3du/unbU Q5WkuzCK9Wm+q7wrqxVtmatzDOOMmAU= ARC-Authentication-Results: i=1; imf10.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=UerHPcIh; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf10.hostedemail.com: domain of ljs@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=ljs@kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1773929509; a=rsa-sha256; cv=none; b=KMaCzY8dQCBcTHk1QXiBf7jkgJnLCbLnZyAeRBR5mXeynfVuWm1wh9j0XaTAcPwr52U5t1 tx45fXLklY/sc+epi39HDPA1Ue9Kqk9NExOgnJXf/WYyr0n/R5hdtULpF/a2cB0oNO2VUB bNHjPxoqnbIdJfzfbTcF81pvC3B2fQg= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id B92D440BCE; Thu, 19 Mar 2026 14:11:47 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 664A8C19424; Thu, 19 Mar 2026 14:11:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773929507; bh=MivZjiW5NvagivYMYH70K18NXOP+4XjdCcrtxZRKzWw=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=UerHPcIhZf5iw1L4uJ064Sm5pT3BEiIczGzptBjlWHw2pf3d+tNXIabR0FlPqyIRk i5A/s8jANJQ+6DUKj9E72Pk/lWL3jerwH8bHCa5SFCaU4jhsmeb+7/x+Ua9i0WELOr Ul+vuoba3lTnp86TRF2Gqt6t+s9MBbPodYgntONPFxSLb6c4CzdLpTzVBK9FDDgtpb GtbHzfXlvHPbrSvV7xXFxD3nRPfQ6pzF6z2CrsaJL1o1mZx8i0TVCMMHxmzlmccQr2 TxqxhEmmNyEKoFOHBIAHTBuL5gqIQSxljyLvzzcUAdFWSowUlBD6xMHugYmz7rRveT VQko93pO+Dwtw== Date: Thu, 19 Mar 2026 14:11:34 +0000 From: "Lorenzo Stoakes (Oracle)" To: "David Hildenbrand (Arm)" Cc: linux-kernel@vger.kernel.org, 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 , "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 Subject: Re: [PATCH 1/2] mm: remove CONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE Message-ID: <2b23080c-0af9-4269-958b-957e7c093258@lucifer.local> References: <20260319-config_migration-v1-0-42270124966f@kernel.org> <20260319-config_migration-v1-1-42270124966f@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260319-config_migration-v1-1-42270124966f@kernel.org> X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: C5EB7C0006 X-Stat-Signature: knhie4oqsbtsxmonhe4cw44d8d1w7d5z X-Rspam-User: X-HE-Tag: 1773929508-335156 X-HE-Meta: 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 krsCvped iXKJ3xfEguv0e1WQXNCRIPHtXIdqcpfzFQ97K1yn2L7B+9R8MjJ+TWpzrSvnIl47xpLWuJy7pE7qjcjjPJdH3CJtAHQLRLVSaSBLV4nivLGpBR5a5Qkxr+JcKZntoE6I8FkqR33Gx5QQBY2O5gES8FiDfUefpZfb+jS5r7gqs7XPNtdStW+BtHjvSv2S8muSrRNXUVFXkiiPVvTxIrEGTZeFFl3Be451+eHG3La8G+htv85XUb0eCh6qKGk9TKJQ2qAzru+116xvlZ/FJ5CS4RjKu+AwIjC2v2ayo9Hy4Q3f60a5NU3oexoJJS+H14RZ2U/SFiSzcjqe7SIwbzqiSLPjtine5BVrnZP3o7UQseMkEMsiYFqnRgtWuHfxVcdzIPTC5 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Mar 19, 2026 at 09:19:40AM +0100, David Hildenbrand (Arm) wrote: > 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). Makes sense! > > We'll clean up CONFIG_MIGRATION next. > > Signed-off-by: David Hildenbrand (Arm) LGTM, so: Reviewed-by: Lorenzo Stoakes (Oracle) > --- > 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 && MIGRATION > 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 > > -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 > > 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 > > -- > 2.43.0 >