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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 95263C433EF for ; Thu, 7 Oct 2021 09:02:18 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 3D8ED60FC3 for ; Thu, 7 Oct 2021 09:02:18 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 3D8ED60FC3 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id BFEB46B006C; Thu, 7 Oct 2021 05:02:17 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B88126B0071; Thu, 7 Oct 2021 05:02:17 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A29166B0073; Thu, 7 Oct 2021 05:02:17 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0006.hostedemail.com [216.40.44.6]) by kanga.kvack.org (Postfix) with ESMTP id 932626B006C for ; Thu, 7 Oct 2021 05:02:17 -0400 (EDT) Received: from smtpin35.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 41C2131E42 for ; Thu, 7 Oct 2021 09:02:17 +0000 (UTC) X-FDA: 78669049914.35.D3CF8C0 Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.220.28]) by imf07.hostedemail.com (Postfix) with ESMTP id C007D1001C8B for ; Thu, 7 Oct 2021 09:02:16 +0000 (UTC) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id 30EC22262B; Thu, 7 Oct 2021 09:02:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1633597335; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=TvTy7OIFpMRsbso1NF1f6Ks+BgvmrJ6wkv3NW7NfJyY=; b=GNTEZSz7kgdAFwe28alhJ/eP+02Z1EOihzX+n9vgBwes/WRv9pASKWGhtrUDxgfMG1b8bt eD1XA2PxyYXX9LAPbMAWcHuixO0YxRCluf3P/ht02R7TKYo50KBLYUtBCNMgLJEKjh6WKV 20A4InA3XI2jHfLnQHnOad/06SY09Fg= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1633597335; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=TvTy7OIFpMRsbso1NF1f6Ks+BgvmrJ6wkv3NW7NfJyY=; b=LnmiiJ98gJZKCmXY5/iYk60e5PM03lAS4VN2Ge0taIvYAilG9n+pj9T7gNMBcMdDsc9obF rnsZE5qa74+KAUCA== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 34A8B13B1B; Thu, 7 Oct 2021 09:02:13 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id QJzlB5W3XmG6KAAAMHmgww (envelope-from ); Thu, 07 Oct 2021 09:02:13 +0000 Date: Thu, 7 Oct 2021 11:02:11 +0200 From: Oscar Salvador To: David Hildenbrand Cc: linux-kernel@vger.kernel.org, Andrew Morton , Jonathan Corbet , Alex Shi , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Greg Kroah-Hartman , "Rafael J. Wysocki" , "Michael S. Tsirkin" , Jason Wang , Shuah Khan , Michal Hocko , Mike Rapoport , x86@kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-doc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, virtualization@lists.linux-foundation.org Subject: Re: [PATCH v1 3/6] mm/memory_hotplug: restrict CONFIG_MEMORY_HOTPLUG to 64 bit Message-ID: References: <20210929143600.49379-1-david@redhat.com> <20210929143600.49379-4-david@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210929143600.49379-4-david@redhat.com> X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: C007D1001C8B X-Stat-Signature: n1po17woprbo848ep7azkfqmerxzjywq Authentication-Results: imf07.hostedemail.com; dkim=pass header.d=suse.de header.s=susede2_rsa header.b=GNTEZSz7; dkim=pass header.d=suse.de header.s=susede2_ed25519 header.b=LnmiiJ98; dmarc=pass (policy=none) header.from=suse.de; spf=pass (imf07.hostedemail.com: domain of osalvador@suse.de designates 195.135.220.28 as permitted sender) smtp.mailfrom=osalvador@suse.de X-HE-Tag: 1633597336-979848 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Sep 29, 2021 at 04:35:57PM +0200, David Hildenbrand wrote: > 32 bit support is broken in various ways: for example, we can online > memory that should actually go to ZONE_HIGHMEM to ZONE_MOVABLE or in > some cases even to one of the other kernel zones. > > We marked it BROKEN in commit b59d02ed0869 ("mm/memory_hotplug: disable the > functionality for 32b") almost one year ago. According to that commit > it might be broken at least since 2017. Further, there is hardly a sane use > case nowadays. > > Let's just depend completely on 64bit, dropping the "BROKEN" dependency to > make clear that we are not going to support it again. Next, we'll remove > some HIGHMEM leftovers from memory hotplug code to clean up. > > Signed-off-by: David Hildenbrand Reviewed-by: Oscar Salvador > --- > mm/Kconfig | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/mm/Kconfig b/mm/Kconfig > index ea8762cd8e1e..88273dd5c6d6 100644 > --- a/mm/Kconfig > +++ b/mm/Kconfig > @@ -125,7 +125,7 @@ config MEMORY_HOTPLUG > select MEMORY_ISOLATION > depends on SPARSEMEM > depends on ARCH_ENABLE_MEMORY_HOTPLUG > - depends on 64BIT || BROKEN > + depends on 64BIT > select NUMA_KEEP_MEMINFO if NUMA > > config MEMORY_HOTPLUG_DEFAULT_ONLINE > -- > 2.31.1 > > -- Oscar Salvador SUSE Labs