From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com ([209.132.183.28]:53132 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727018AbfJAOla (ORCPT ); Tue, 1 Oct 2019 10:41:30 -0400 From: David Hildenbrand Subject: [PATCH v5 06/10] mm/memory_hotplug: Poison memmap in remove_pfn_range_from_zone() Date: Tue, 1 Oct 2019 16:40:07 +0200 Message-Id: <20191001144011.3801-7-david@redhat.com> In-Reply-To: <20191001144011.3801-1-david@redhat.com> References: <20191001144011.3801-1-david@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-s390-owner@vger.kernel.org List-ID: To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, David Hildenbrand , Andrew Morton , Oscar Salvador , Michal Hocko , Pavel Tatashin , Dan Williams Let's poison the pages similar to when adding new memory in sparse_add_section(). Also call remove_pfn_range_from_zone() from memunmap_pages(), so we can poison the memmap from there as well. While at it, calculate the pfn in memunmap_pages() only once. Cc: Andrew Morton Cc: David Hildenbrand Cc: Oscar Salvador Cc: Michal Hocko Cc: Pavel Tatashin Cc: Dan Williams Signed-off-by: David Hildenbrand --- mm/memory_hotplug.c | 3 +++ mm/memremap.c | 2 ++ 2 files changed, 5 insertions(+) diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index cef909ebd807..640309236a58 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -464,6 +464,9 @@ void __ref remove_pfn_range_from_zone(struct zone *zone, struct pglist_data *pgdat = zone->zone_pgdat; unsigned long flags; + /* Poison struct pages because they are now uninitialized again. */ + page_init_poison(pfn_to_page(start_pfn), sizeof(struct page) * nr_pages); + /* * Zone shrinking code cannot properly deal with ZONE_DEVICE. So * we will not try to shrink the zones - which is okay as diff --git a/mm/memremap.c b/mm/memremap.c index 734afeaad811..371939f92b69 100644 --- a/mm/memremap.c +++ b/mm/memremap.c @@ -139,6 +139,8 @@ void memunmap_pages(struct dev_pagemap *pgmap) nid = page_to_nid(pfn_to_page(start_pfn)); mem_hotplug_begin(); + remove_pfn_range_from_zone(page_zone(pfn_to_page(start_pfn)), + start_pfn, nr_pages); if (pgmap->type == MEMORY_DEVICE_PRIVATE) { __remove_pages(start_pfn, nr_pages, NULL); } else { -- 2.21.0