From mboxrd@z Thu Jan 1 00:00:00 1970 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 C49BC36CDE9; Wed, 18 Mar 2026 07:55:15 +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=1773820515; cv=none; b=DAjYzVHHKTvZ7JsVwg1FlRxuFJ0eO0ROWDmzhcYZ4oVBszVJTWbsxgs+p8waLgCvxJbaL2BeQKKtN2E1Ly/py5Dwb1ZhNQBKNhVn54eVBkI8L4zvEXobEiWOpvHm1676WxvvWPBBLO1NSHqtZwN+1RqSyNoaeEUA9sopuowM5To= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773820515; c=relaxed/simple; bh=393sZvR/gqTP0vkDNjf01M+bgmlTncpIIPSe+0jujU4=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=NuQMaSYdbo5X+q3vGGajYc7wIL/uMxoS5xSVfwhSOKFTdlfz7EENnEIdGuhi2PDg7gF1krpO7aZ/QuKW8pcQh5ZL+FmaKcUNqGHIPPYZav/x+l5KM0mg+DHWz5NnP8eJQqW4AupjvAL8q2XPjimSnVfLmyg6//ZMvC5/NSpMrp8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=qa87uBHG; 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="qa87uBHG" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 369B2C19421; Wed, 18 Mar 2026 07:55:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773820515; bh=393sZvR/gqTP0vkDNjf01M+bgmlTncpIIPSe+0jujU4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=qa87uBHGvCKrjka/oAwuJqQUG3jiZBm346/TSkvdTVAmDymvQKrv58X67MzKzTCLI GOjv+L8f3tgf06T335Ln0r20UuvjG4fTwAfaQbMTAFp76VpkhkSsAz4v7YXaQLcW78 KkfRAacm47ueuWtSSvZrkjLqoKrh/cFZVA/6J0VZ/PeI+S38NdPODimoTOxeFM7GZS GVo/KZ8U4ZA9yEZn5L/GzlPCOwViswc4NDtBQQZm8/69vvKmR5+XOV9tif3R0JM7Kl Sv7Y4WtnDsIU0lfx6eMJfmo/X906W74olhjxCYHorRM+Ep8Yx4xnHi2tgx8BLBt/y0 Akxv9+WGEBu9Q== Date: Wed, 18 Mar 2026 09:55:07 +0200 From: Mike Rapoport To: "David Hildenbrand (Arm)" Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-cxl@vger.kernel.org, Andrew Morton , Oscar Salvador , Axel Rasmussen , Yuanchu Xie , Wei Xu , Lorenzo Stoakes , "Liam R. 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> 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=us-ascii Content-Disposition: inline In-Reply-To: <20260317165652.99114-4-david@kernel.org> 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.