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=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 3381AC433FF for ; Wed, 14 Aug 2019 15:41:21 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 01C852084D for ; Wed, 14 Aug 2019 15:41:21 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 01C852084D 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 A0CA26B0006; Wed, 14 Aug 2019 11:41:20 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 9BB386B0007; Wed, 14 Aug 2019 11:41:20 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 8F8696B000D; Wed, 14 Aug 2019 11:41:20 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0047.hostedemail.com [216.40.44.47]) by kanga.kvack.org (Postfix) with ESMTP id 6B61A6B0006 for ; Wed, 14 Aug 2019 11:41:20 -0400 (EDT) Received: from smtpin28.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with SMTP id 2067040C3 for ; Wed, 14 Aug 2019 15:41:20 +0000 (UTC) X-FDA: 75821447520.28.sleet45_28a27d0fe721c X-HE-Tag: sleet45_28a27d0fe721c X-Filterd-Recvd-Size: 3057 Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by imf40.hostedemail.com (Postfix) with ESMTP for ; Wed, 14 Aug 2019 15:41:19 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 5221351F00; Wed, 14 Aug 2019 15:41:18 +0000 (UTC) Received: from t460s.redhat.com (ovpn-116-49.ams2.redhat.com [10.36.116.49]) by smtp.corp.redhat.com (Postfix) with ESMTP id D540F8069C; Wed, 14 Aug 2019 15:41:15 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, David Hildenbrand , Dan Williams , Borislav Petkov , Andrew Morton , Bjorn Helgaas , Ingo Molnar , Dave Hansen , Nadav Amit , Wei Yang , Oscar Salvador , Michal Hocko Subject: [PATCH v2 1/5] resource: Use PFN_UP / PFN_DOWN in walk_system_ram_range() Date: Wed, 14 Aug 2019 17:41:05 +0200 Message-Id: <20190814154109.3448-2-david@redhat.com> In-Reply-To: <20190814154109.3448-1-david@redhat.com> References: <20190814154109.3448-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Wed, 14 Aug 2019 15:41:18 +0000 (UTC) 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: This makes it clearer that we will never call func() with duplicate PFNs in case we have multiple sub-page memory resources. All unaligned parts of PFNs are completely discarded. Cc: Dan Williams Cc: Borislav Petkov Cc: Andrew Morton Cc: Bjorn Helgaas Cc: Ingo Molnar Cc: Dave Hansen Cc: Nadav Amit Cc: Wei Yang Cc: Oscar Salvador Acked-by: Michal Hocko Signed-off-by: David Hildenbrand --- kernel/resource.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/resource.c b/kernel/resource.c index 7ea4306503c5..88ee39fa9103 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -487,8 +487,8 @@ int walk_system_ram_range(unsigned long start_pfn, un= signed long nr_pages, while (start < end && !find_next_iomem_res(start, end, flags, IORES_DESC_NONE, false, &res)) { - pfn =3D (res.start + PAGE_SIZE - 1) >> PAGE_SHIFT; - end_pfn =3D (res.end + 1) >> PAGE_SHIFT; + pfn =3D PFN_UP(res.start); + end_pfn =3D PFN_DOWN(res.end + 1); if (end_pfn > pfn) ret =3D (*func)(pfn, end_pfn - pfn, arg); if (ret) --=20 2.21.0