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 X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BF9E4CA9EAF for ; Thu, 24 Oct 2019 12:14:25 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 83B3420856 for ; Thu, 24 Oct 2019 12:14:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Rfmec48j" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 83B3420856 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 34BA26B026B; Thu, 24 Oct 2019 08:14:25 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 2FB476B026C; Thu, 24 Oct 2019 08:14:25 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 1C2A86B026D; Thu, 24 Oct 2019 08:14:25 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0040.hostedemail.com [216.40.44.40]) by kanga.kvack.org (Postfix) with ESMTP id ECE9C6B026B for ; Thu, 24 Oct 2019 08:14:24 -0400 (EDT) Received: from smtpin16.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with SMTP id 79014499619 for ; Thu, 24 Oct 2019 12:14:24 +0000 (UTC) X-FDA: 76078570848.16.farm09_266f50b531254 X-HE-Tag: farm09_266f50b531254 X-Filterd-Recvd-Size: 5916 Received: from us-smtp-1.mimecast.com (us-smtp-delivery-1.mimecast.com [205.139.110.120]) by imf14.hostedemail.com (Postfix) with ESMTP for ; Thu, 24 Oct 2019 12:14:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1571919263; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=1YxG8LTmp2DdNmR96mx6EPMKm57sikpokfCgsqoqhbU=; b=Rfmec48jCcWV7+GY49SOXEBc6DNBXOvXSnbZwRzbqkwCsodsJafWLlRB/k6eGKCDuCcrkg VQCBo+I9ACRnOSaAyGY5byukiM6W7n5TEe1cU7IpGAFNfRqqd0D3vnvDhsUCJkEwu5iryB VdZXS8Q6d8x/UqEnLm6B2ra7Uy1OZK4= 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-18-37WSCG0IOc2aalj4O1vt1g-1; Thu, 24 Oct 2019 08:14:22 -0400 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id D798B800D49; Thu, 24 Oct 2019 12:14:16 +0000 (UTC) Received: from t460s.redhat.com (ovpn-116-141.ams2.redhat.com [10.36.116.141]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1F37C196B2; Thu, 24 Oct 2019 12:13:57 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, David Hildenbrand , Michal Hocko , Andrew Morton , kvm-ppc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org, linux-hyperv@vger.kernel.org, devel@driverdev.osuosl.org, xen-devel@lists.xenproject.org, x86@kernel.org, Alexander Duyck , Alexander Duyck , Alex Williamson , Allison Randal , Andy Lutomirski , "Aneesh Kumar K.V" , Anshuman Khandual , Anthony Yznaga , Benjamin Herrenschmidt , Borislav Petkov , Boris Ostrovsky , Christophe Leroy , Cornelia Huck , Dan Williams , Dave Hansen , Haiyang Zhang , "H. Peter Anvin" , Ingo Molnar , "Isaac J. Manjarres" , Jim Mattson , Joerg Roedel , Johannes Weiner , Juergen Gross , KarimAllah Ahmed , Kees Cook , "K. Y. Srinivasan" , "Matthew Wilcox (Oracle)" , Matt Sickler , Mel Gorman , Michael Ellerman , Michal Hocko , Mike Rapoport , Mike Rapoport , Nicholas Piggin , Oscar Salvador , Paolo Bonzini , Paul Mackerras , Paul Mackerras , Pavel Tatashin , Pavel Tatashin , Peter Zijlstra , Qian Cai , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Sasha Levin , Sean Christopherson , Stefano Stabellini , Stephen Hemminger , Thomas Gleixner , Vitaly Kuznetsov , Vlastimil Babka , Wanpeng Li , YueHaibing Subject: [PATCH v1 10/10] mm/usercopy.c: Update comment in check_page_span() regarding ZONE_DEVICE Date: Thu, 24 Oct 2019 14:09:38 +0200 Message-Id: <20191024120938.11237-11-david@redhat.com> In-Reply-To: <20191024120938.11237-1-david@redhat.com> References: <20191024120938.11237-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-MC-Unique: 37WSCG0IOc2aalj4O1vt1g-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=WINDOWS-1252 Content-Transfer-Encoding: quoted-printable 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: ZONE_DEVICE (a.k.a. device memory) is no longer marked PG_reserved. Update the comment. While at it, make it match what the code is acutally doing (reject vs. accept). Cc: Kees Cook Cc: Andrew Morton Cc: "Isaac J. Manjarres" Cc: "Matthew Wilcox (Oracle)" Cc: Qian Cai Cc: Thomas Gleixner Signed-off-by: David Hildenbrand --- mm/usercopy.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/mm/usercopy.c b/mm/usercopy.c index 660717a1ea5c..80f254024c97 100644 --- a/mm/usercopy.c +++ b/mm/usercopy.c @@ -199,9 +199,9 @@ static inline void check_page_span(const void *ptr, uns= igned long n, =09=09return; =20 =09/* -=09 * Reject if range is entirely either Reserved (i.e. special or -=09 * device memory), or CMA. Otherwise, reject since the object spans -=09 * several independently allocated pages. +=09 * Accept if the range is entirely either Reserved ("special") or +=09 * CMA. Otherwise, reject since the object spans several independently +=09 * allocated pages. =09 */ =09is_reserved =3D PageReserved(page); =09is_cma =3D is_migrate_cma_page(page); --=20 2.21.0