From patchwork Wed Sep 29 14:35:57 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 12525667 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 908DEC43217 for ; Wed, 29 Sep 2021 14:37:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 795DB613CD for ; Wed, 29 Sep 2021 14:37:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344538AbhI2OjF (ORCPT ); Wed, 29 Sep 2021 10:39:05 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:35568 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344557AbhI2OjB (ORCPT ); Wed, 29 Sep 2021 10:39:01 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1632926240; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=hw0JON3PSPNzJHfAUlyfJy6KTExGOX1e2ePjdnrAKBE=; b=IH/8ML6nhlNIskKiDz4Frg131lLtX+EAxXueSkFhsQbafRR7dPbnHbhkJ0NdUnUTzdJFzf P9hF+DpX9MBLImx+dpOkuBtcerd1qp6JKqgL/9qIeg3A7yZLC/0SxNrKwaKN+SUucdVKjI 624tunqB+oUBTcUvRJImVSd//CdTmVU= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-519-Xso30JzGNKapCJmAP5WIeA-1; Wed, 29 Sep 2021 10:37:18 -0400 X-MC-Unique: Xso30JzGNKapCJmAP5WIeA-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id F1D29802C94; Wed, 29 Sep 2021 14:37:14 +0000 (UTC) Received: from t480s.redhat.com (unknown [10.39.195.135]) by smtp.corp.redhat.com (Postfix) with ESMTP id C6CE510016F4; Wed, 29 Sep 2021 14:37:08 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: David Hildenbrand , 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 , Oscar Salvador , 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: [PATCH v1 3/6] mm/memory_hotplug: restrict CONFIG_MEMORY_HOTPLUG to 64 bit Date: Wed, 29 Sep 2021 16:35:57 +0200 Message-Id: <20210929143600.49379-4-david@redhat.com> In-Reply-To: <20210929143600.49379-1-david@redhat.com> References: <20210929143600.49379-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org 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