From patchwork Thu Feb 20 04:33:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Baoquan He X-Patchwork-Id: 11393287 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B181B13A4 for ; Thu, 20 Feb 2020 04:33:53 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 7E99624673 for ; Thu, 20 Feb 2020 04:33:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="TZUU2Dt1" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7E99624673 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 B883C6B0008; Wed, 19 Feb 2020 23:33:52 -0500 (EST) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id B38BF6B000A; Wed, 19 Feb 2020 23:33:52 -0500 (EST) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 9D9866B000C; Wed, 19 Feb 2020 23:33:52 -0500 (EST) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0093.hostedemail.com [216.40.44.93]) by kanga.kvack.org (Postfix) with ESMTP id 8521D6B0008 for ; Wed, 19 Feb 2020 23:33:52 -0500 (EST) Received: from smtpin28.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 4B4DB824805A for ; Thu, 20 Feb 2020 04:33:52 +0000 (UTC) X-FDA: 76509237504.28.act76_21c8adbf21248 X-Spam-Summary: 1,0,0,,d41d8cd98f00b204,bhe@redhat.com,:linux-kernel@vger.kernel.org::akpm@linux-foundation.org:richardw.yang@linux.intel.com:david@redhat.com:osalvador@suse.de:dan.j.williams@intel.com:mhocko@suse.com:bhe@redhat.com:rppt@linux.ibm.com:robin.murphy@arm.com,RULES_HIT:30012:30034:30054,0,RBL:205.139.110.120:@redhat.com:.lbl8.mailshell.net-62.18.0.100 66.10.201.10,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:ft,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:23,LUA_SUMMARY:none X-HE-Tag: act76_21c8adbf21248 X-Filterd-Recvd-Size: 5145 Received: from us-smtp-1.mimecast.com (us-smtp-delivery-1.mimecast.com [205.139.110.120]) by imf27.hostedemail.com (Postfix) with ESMTP for ; Thu, 20 Feb 2020 04:33:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1582173231; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:in-reply-to:in-reply-to:references:references; bh=qCQa83ebMhYRS+/RYU756BhqBknrzlZVZWgnaECEj/U=; b=TZUU2Dt1BZmzZs1nL9DuPjH5C9UdecsEHV7Rjx2E/v/+CkyULUYDXbwtuM9SvshD4S9FAM u9eE/1kXnKzhNy75Bh1nMpmbXV0mzvFblqwc4QyCmeXnFlHWDjasXq5gyAwFJTSlwTW79R dOgJmq3u1xczvFLDSHSCwSoNynQIlQk= 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-84-nQQ10umtMxqn1IHit_NLdA-1; Wed, 19 Feb 2020 23:33:47 -0500 X-MC-Unique: nQQ10umtMxqn1IHit_NLdA-1 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 mimecast-mx01.redhat.com (Postfix) with ESMTPS id 879F5801E6C; Thu, 20 Feb 2020 04:33:45 +0000 (UTC) Received: from MiWiFi-R3L-srv.redhat.com (ovpn-12-32.pek2.redhat.com [10.72.12.32]) by smtp.corp.redhat.com (Postfix) with ESMTP id B84AE5DA60; Thu, 20 Feb 2020 04:33:38 +0000 (UTC) From: Baoquan He To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, akpm@linux-foundation.org, richardw.yang@linux.intel.com, david@redhat.com, osalvador@suse.de, dan.j.williams@intel.com, mhocko@suse.com, bhe@redhat.com, rppt@linux.ibm.com, robin.murphy@arm.com Subject: [PATCH v2 3/7] mm/sparse.c: introduce a new function clear_subsection_map() Date: Thu, 20 Feb 2020 12:33:12 +0800 Message-Id: <20200220043316.19668-4-bhe@redhat.com> In-Reply-To: <20200220043316.19668-1-bhe@redhat.com> References: <20200220043316.19668-1-bhe@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 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: Wrap the codes which clear subsection map of one memory region from section_deactivate() into clear_subsection_map(). Signed-off-by: Baoquan He Reviewed-by: Wei Yang --- mm/sparse.c | 46 ++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 38 insertions(+), 8 deletions(-) diff --git a/mm/sparse.c b/mm/sparse.c index 977b47acd38d..df857ee9330c 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -726,14 +726,25 @@ static void free_map_bootmem(struct page *memmap) } #endif /* CONFIG_SPARSEMEM_VMEMMAP */ -static void section_deactivate(unsigned long pfn, unsigned long nr_pages, - struct vmem_altmap *altmap) +/** + * clear_subsection_map - Clear subsection map of one memory region + * + * @pfn - start pfn of the memory range + * @nr_pages - number of pfns to add in the region + * + * This is only intended for hotplug, and clear the related subsection + * map inside one section. + * + * Return: + * * -EINVAL - Section already deactived. + * * 0 - Subsection map is emptied. + * * 1 - Subsection map is not empty. + */ +static int clear_subsection_map(unsigned long pfn, unsigned long nr_pages) { DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 }; DECLARE_BITMAP(tmp, SUBSECTIONS_PER_SECTION) = { 0 }; struct mem_section *ms = __pfn_to_section(pfn); - bool section_is_early = early_section(ms); - struct page *memmap = NULL; unsigned long *subsection_map = ms->usage ? &ms->usage->subsection_map[0] : NULL; @@ -744,8 +755,28 @@ static void section_deactivate(unsigned long pfn, unsigned long nr_pages, if (WARN(!subsection_map || !bitmap_equal(tmp, map, SUBSECTIONS_PER_SECTION), "section already deactivated (%#lx + %ld)\n", pfn, nr_pages)) - return; + return -EINVAL; + + bitmap_xor(subsection_map, map, subsection_map, SUBSECTIONS_PER_SECTION); + if (bitmap_empty(subsection_map, SUBSECTIONS_PER_SECTION)) + return 0; + + return 1; +} + +static void section_deactivate(unsigned long pfn, unsigned long nr_pages, + struct vmem_altmap *altmap) +{ + struct mem_section *ms = __pfn_to_section(pfn); + bool section_is_early = early_section(ms); + struct page *memmap = NULL; + int rc; + + + rc = clear_subsection_map(pfn, nr_pages); + if (IS_ERR_VALUE((unsigned long)rc)) + return; /* * There are 3 cases to handle across two configurations * (SPARSEMEM_VMEMMAP={y,n}): @@ -763,8 +794,7 @@ static void section_deactivate(unsigned long pfn, unsigned long nr_pages, * * For 2/ and 3/ the SPARSEMEM_VMEMMAP={y,n} cases are unified */ - bitmap_xor(subsection_map, map, subsection_map, SUBSECTIONS_PER_SECTION); - if (bitmap_empty(subsection_map, SUBSECTIONS_PER_SECTION)) { + if (!rc) { unsigned long section_nr = pfn_to_section_nr(pfn); /* @@ -786,7 +816,7 @@ static void section_deactivate(unsigned long pfn, unsigned long nr_pages, else depopulate_section_memmap(pfn, nr_pages, altmap); - if (bitmap_empty(subsection_map, SUBSECTIONS_PER_SECTION)) + if (!rc) ms->section_mem_map = (unsigned long)NULL; }