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 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 E87CCC4360C for ; Sun, 6 Oct 2019 08:57:47 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B79C92133F for ; Sun, 6 Oct 2019 08:57:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B79C92133F 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 64F2B6B0269; Sun, 6 Oct 2019 04:57:47 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 5FF9E6B026A; Sun, 6 Oct 2019 04:57:47 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 514B16B026B; Sun, 6 Oct 2019 04:57:47 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0250.hostedemail.com [216.40.44.250]) by kanga.kvack.org (Postfix) with ESMTP id 2B57C6B0269 for ; Sun, 6 Oct 2019 04:57:47 -0400 (EDT) Received: from smtpin25.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with SMTP id B8E72824CA3D for ; Sun, 6 Oct 2019 08:57:46 +0000 (UTC) X-FDA: 76012756932.25.joke04_26c4cdbfcab2d X-HE-Tag: joke04_26c4cdbfcab2d X-Filterd-Recvd-Size: 3582 Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by imf26.hostedemail.com (Postfix) with ESMTP for ; Sun, 6 Oct 2019 08:57:46 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 75465368CF; Sun, 6 Oct 2019 08:57:45 +0000 (UTC) Received: from t460s.redhat.com (ovpn-116-58.ams2.redhat.com [10.36.116.58]) by smtp.corp.redhat.com (Postfix) with ESMTP id ABE055EE1D; Sun, 6 Oct 2019 08:57:42 +0000 (UTC) From: David Hildenbrand 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, x86@kernel.org, David Hildenbrand , Andrew Morton , Oscar Salvador , Michal Hocko , Pavel Tatashin , Dan Williams , Wei Yang Subject: [PATCH v6 10/10] mm/memory_hotplug: Cleanup __remove_pages() Date: Sun, 6 Oct 2019 10:56:46 +0200 Message-Id: <20191006085646.5768-11-david@redhat.com> In-Reply-To: <20191006085646.5768-1-david@redhat.com> References: <20191006085646.5768-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Sun, 06 Oct 2019 08:57:45 +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: Let's drop the basically unused section stuff and simplify. Also, let's use a shorter variant to calculate the number of pages to the next section boundary. Cc: Andrew Morton Cc: Oscar Salvador Cc: Michal Hocko Cc: Pavel Tatashin Cc: Dan Williams Cc: Wei Yang Signed-off-by: David Hildenbrand --- mm/memory_hotplug.c | 17 ++++++----------- 1 file changed, 6 insertions(+), 11 deletions(-) diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 843481bd507d..2275240cfa10 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -490,25 +490,20 @@ static void __remove_section(unsigned long pfn, uns= igned long nr_pages, void __remove_pages(unsigned long pfn, unsigned long nr_pages, struct vmem_altmap *altmap) { + const unsigned long end_pfn =3D pfn + nr_pages; + unsigned long cur_nr_pages; unsigned long map_offset =3D 0; - unsigned long nr, start_sec, end_sec; =20 map_offset =3D vmem_altmap_offset(altmap); =20 if (check_pfn_span(pfn, nr_pages, "remove")) return; =20 - start_sec =3D pfn_to_section_nr(pfn); - end_sec =3D pfn_to_section_nr(pfn + nr_pages - 1); - for (nr =3D start_sec; nr <=3D end_sec; nr++) { - unsigned long pfns; - + for (; pfn < end_pfn; pfn +=3D cur_nr_pages) { cond_resched(); - pfns =3D min(nr_pages, PAGES_PER_SECTION - - (pfn & ~PAGE_SECTION_MASK)); - __remove_section(pfn, pfns, map_offset, altmap); - pfn +=3D pfns; - nr_pages -=3D pfns; + /* Select all remaining pages up to the next section boundary */ + cur_nr_pages =3D min(end_pfn - pfn, -(pfn | PAGE_SECTION_MASK)); + __remove_section(pfn, cur_nr_pages, map_offset, altmap); map_offset =3D 0; } } --=20 2.21.0