Received: by 2002:ac0:bc90:0:0:0:0:0 with SMTP id a16csp320243img; Wed, 20 Mar 2019 01:06:11 -0700 (PDT) X-Google-Smtp-Source: APXvYqw8yWz45+iAllbIJvpGsvU/1+wqY/8TxtMiSN4p4Vg4OAYT4XdOq16H+HqUal6hNKC+5iGj X-Received: by 2002:a65:4145:: with SMTP id x5mr6006285pgp.144.1553069171823; Wed, 20 Mar 2019 01:06:11 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1553069171; cv=none; d=google.com; s=arc-20160816; b=OJcx+QGpLfD9v7Ht8UdUuHfJiy8ZcBiVH5NBsxSqCmJi9p2KAdhpwrb6uiKLMHilD7 BrUG/BS4WHvNY53ZVetLEY+BX1kx1CNHdmgOV3s7gmd+DM+L4y0EPKq2jQTm/MKHqRLj 3Q/9E3X4+NIv59cM2/0TMwLPMvoxRtWX5oVMR4JyxTUwfkOvl1AgS4e2Sv/ZvxpTN6V6 8J/gEZBV0NsIi36Xo4TxQ8rCtsJhiHsDq+ug/po93uP/sIcuMngemLW4Sqh/8YzJn8sg kQZh5eZ+jsLVxI7Ca1rEYhQF/IZMfbirBGTgT2P/euTWDbjbBctuP1HemAXNziJ027Do 0Utg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:user-agent:in-reply-to :content-disposition:mime-version:references:message-id:subject:cc :to:from:date; bh=6fSV1xihtFs9HIk6vq1wvpEsHnhoTbXCqEQFzUq1J4M=; b=Wh4PGa6to8SWEJJgJyBR942HfLMpj1qiIWc1YScsu1jNwrch9FUcxejtu9KS/jWoo6 H1cr74KFf5apKs6kfqDf06sYMD4QHWsbHtDe94btM7OgTS3RL/CV7DDwI4DSvtcfCkzb CH1yccQ5mGyPquxzEbl4BswaxB+zZnonOXLXs3Sn0lH7otXNk2UFSwpvDcBjQ6oVK095 Nv0huTOPlLdThVuDiBPL08ew9ocOxxUq6MgFzTrdvJSYbT7tFSL1ATy3oJqlUFB9nU9B Yt+pEFhxBbA8zIt9dnDQ8zqMgQjGjS4+ewuQcDVGEO7rxk4oV7SaSc64WdnZuM6y0INT TjJw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=redhat.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id c11si1111062pfc.39.2019.03.20.01.05.56; Wed, 20 Mar 2019 01:06:11 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727693AbfCTIDk (ORCPT + 99 others); Wed, 20 Mar 2019 04:03:40 -0400 Received: from mx1.redhat.com ([209.132.183.28]:52102 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727514AbfCTIDk (ORCPT ); Wed, 20 Mar 2019 04:03:40 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 44C1AC01089C; Wed, 20 Mar 2019 08:03:40 +0000 (UTC) Received: from localhost (ovpn-12-38.pek2.redhat.com [10.72.12.38]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 2823A6B499; Wed, 20 Mar 2019 08:03:36 +0000 (UTC) Date: Wed, 20 Mar 2019 16:03:34 +0800 From: Baoquan He To: Mike Rapoport Cc: linux-kernel@vger.kernel.org, akpm@linux-foundation.org, pasha.tatashin@oracle.com, mhocko@suse.com, rppt@linux.vnet.ibm.com, richard.weiyang@gmail.com, linux-mm@kvack.org Subject: Re: [PATCH 2/3] mm/sparse: Optimize sparse_add_one_section() Message-ID: <20190320080334.GM18740@MiWiFi-R3L-srv> References: <20190320073540.12866-1-bhe@redhat.com> <20190320073540.12866-2-bhe@redhat.com> <20190320075649.GC13626@rapoport-lnx> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190320075649.GC13626@rapoport-lnx> User-Agent: Mutt/1.10.1 (2018-07-13) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Wed, 20 Mar 2019 08:03:40 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/20/19 at 09:56am, Mike Rapoport wrote: > > diff --git a/mm/sparse.c b/mm/sparse.c > > index 0a0f82c5d969..054b99f74181 100644 > > --- a/mm/sparse.c > > +++ b/mm/sparse.c > > @@ -697,16 +697,17 @@ int __meminit sparse_add_one_section(int nid, unsigned long start_pfn, > > ret = sparse_index_init(section_nr, nid); > > if (ret < 0 && ret != -EEXIST) > > return ret; > > - ret = 0; > > - memmap = kmalloc_section_memmap(section_nr, nid, altmap); > > - if (!memmap) > > - return -ENOMEM; > > + > > usemap = __kmalloc_section_usemap(); > > - if (!usemap) { > > - __kfree_section_memmap(memmap, altmap); > > + if (!usemap) > > + return -ENOMEM; > > + memmap = kmalloc_section_memmap(section_nr, nid, altmap); > > + if (!memmap) { > > + kfree(usemap); > > If you are anyway changing this why not to switch to goto's for error > handling? OK, I am fine to switch to 'goto'. Will update and repost. Thanks. > > > return -ENOMEM; > > } > > > > + ret = 0; > > ms = __pfn_to_section(start_pfn); > > if (ms->section_mem_map & SECTION_MARKED_PRESENT) { > > ret = -EEXIST; > > -- > > 2.17.2 > > > > -- > Sincerely yours, > Mike. >