From patchwork Fri Dec 14 11:10:08 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 10730903 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B775216B1 for ; Fri, 14 Dec 2018 11:11:41 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A69392D3E7 for ; Fri, 14 Dec 2018 11:11:41 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9A2FC2D42D; Fri, 14 Dec 2018 11:11:41 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 37F392D41B for ; Fri, 14 Dec 2018 11:11:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=QHRDkicFJACepzrEciPtjMidmALB0auvTtUAhEWB0Kg=; b=X/57wWZ1eLa8KbqIRTso/FJQAf P5DPNi+IwVPmfQqoN+GI0xtZ+0f9xDte8s/QHoobkBoOhBHRNB3NmBq5rII18hFx2gY/Imo+S3BAn ACsGJymhT6KMe8b2UuqAsIe6pdFopRKpMcXE6OzbYwtglakRQrshmx+JNUzGn2zf02gHf+zgYF0Rd RCDrTTbDOuP/cs5ON8CQxoI16nvVeC/RbQ6C7QKLHGWHzZv5ro/xTI14Q5dhUn1GTYgDZn22a46h+ Kzhg/Fx5i9sqPHQqrK5kmNMqt9dLdaWXuFBG8udn0vu8JKGaYvBoGockQccV58IM3pSeS1h8hRknZ ileQQ2iw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gXlNa-0008HD-BL; Fri, 14 Dec 2018 11:11:38 +0000 Received: from mx1.redhat.com ([209.132.183.28]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1gXlMs-0007XT-Km; Fri, 14 Dec 2018 11:10:58 +0000 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 1B95C307C94F; Fri, 14 Dec 2018 11:10:54 +0000 (UTC) Received: from t460s.redhat.com (ovpn-117-139.ams2.redhat.com [10.36.117.139]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8BC9E5DA2A; Fri, 14 Dec 2018 11:10:50 +0000 (UTC) From: David Hildenbrand To: linux-mm@kvack.org Subject: [PATCH v1 3/9] powerpc/vdso: don't clear PG_reserved Date: Fri, 14 Dec 2018 12:10:08 +0100 Message-Id: <20181214111014.15672-4-david@redhat.com> In-Reply-To: <20181214111014.15672-1-david@redhat.com> References: <20181214111014.15672-1-david@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.46]); Fri, 14 Dec 2018 11:10:54 +0000 (UTC) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20181214_031054_717046_B8D14AB4 X-CRM114-Status: GOOD ( 13.04 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Christophe Leroy , linux-s390@vger.kernel.org, Kees Cook , David Hildenbrand , Benjamin Herrenschmidt , linux-kernel@vger.kernel.org, Matthew Wilcox , Michal Hocko , linux-m68k@lists.linux-m68k.org, linux-mediatek@lists.infradead.org, Michael Ellerman , Paul Mackerras , linux-riscv@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, Andrew Morton , linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+patchwork-linux-mediatek=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP 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. Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Michael Ellerman Cc: Christophe Leroy Cc: Kees Cook Cc: Andrew Morton Cc: Michal Hocko Cc: Matthew Wilcox Signed-off-by: David Hildenbrand Acked-by: Michael Ellerman (powerpc) --- arch/powerpc/kernel/vdso.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c index 65b3bdb99f0b..d59dc2e9a695 100644 --- a/arch/powerpc/kernel/vdso.c +++ b/arch/powerpc/kernel/vdso.c @@ -795,7 +795,6 @@ static int __init vdso_init(void) BUG_ON(vdso32_pagelist == NULL); for (i = 0; i < vdso32_pages; i++) { struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE); - ClearPageReserved(pg); get_page(pg); vdso32_pagelist[i] = pg; } @@ -809,7 +808,6 @@ static int __init vdso_init(void) BUG_ON(vdso64_pagelist == NULL); for (i = 0; i < vdso64_pages; i++) { struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE); - ClearPageReserved(pg); get_page(pg); vdso64_pagelist[i] = pg; }