From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qt1-f198.google.com (mail-qt1-f198.google.com [209.85.160.198]) by kanga.kvack.org (Postfix) with ESMTP id B19BE8E0002 for ; Mon, 14 Jan 2019 07:59:35 -0500 (EST) Received: by mail-qt1-f198.google.com with SMTP id n95so24333086qte.16 for ; Mon, 14 Jan 2019 04:59:35 -0800 (PST) Received: from mx1.redhat.com (mx1.redhat.com. [209.132.183.28]) by mx.google.com with ESMTPS id c83si6011369qke.5.2019.01.14.04.59.34 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 14 Jan 2019 04:59:35 -0800 (PST) From: David Hildenbrand Subject: [PATCH v2 2/9] s390/vdso: don't clear PG_reserved Date: Mon, 14 Jan 2019 13:58:56 +0100 Message-Id: <20190114125903.24845-3-david@redhat.com> In-Reply-To: <20190114125903.24845-1-david@redhat.com> References: <20190114125903.24845-1-david@redhat.com> Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-m68k@lists.linux-m68k.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-mediatek@lists.infradead.org, David Hildenbrand , Martin Schwidefsky , Heiko Carstens , Matthew Wilcox , Mike Rapoport , Michal Hocko , Vasily Gorbik , Kees Cook , Souptick Joarder , Andrew Morton , Michal Hocko The VDSO is part of the kernel image and therefore the struct pages are marked as reserved during boot. As we install a special mapping, the actual struct pages will never be exposed to MM via the page tables. We can therefore leave the pages marked as reserved. Suggested-by: Martin Schwidefsky Cc: Martin Schwidefsky Cc: Heiko Carstens Cc: Matthew Wilcox Cc: Mike Rapoport Cc: Michal Hocko Cc: Vasily Gorbik Cc: Kees Cook Cc: Souptick Joarder Cc: Andrew Morton Cc: Michal Hocko Signed-off-by: David Hildenbrand --- arch/s390/kernel/vdso.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/arch/s390/kernel/vdso.c b/arch/s390/kernel/vdso.c index 4ff354887db4..e7920a68a12e 100644 --- a/arch/s390/kernel/vdso.c +++ b/arch/s390/kernel/vdso.c @@ -291,7 +291,6 @@ static int __init vdso_init(void) BUG_ON(vdso32_pagelist == NULL); for (i = 0; i < vdso32_pages - 1; i++) { struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE); - ClearPageReserved(pg); get_page(pg); vdso32_pagelist[i] = pg; } @@ -309,7 +308,6 @@ static int __init vdso_init(void) BUG_ON(vdso64_pagelist == NULL); for (i = 0; i < vdso64_pages - 1; i++) { struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE); - ClearPageReserved(pg); get_page(pg); vdso64_pagelist[i] = pg; } -- 2.17.2