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=-8.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=unavailable 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 D66DCC3A5A0 for ; Mon, 19 Aug 2019 13:50:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A895920989 for ; Mon, 19 Aug 2019 13:50:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727781AbfHSNuo (ORCPT ); Mon, 19 Aug 2019 09:50:44 -0400 Received: from mx2.suse.de ([195.135.220.15]:59976 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726987AbfHSNuo (ORCPT ); Mon, 19 Aug 2019 09:50:44 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 28699AFF6; Mon, 19 Aug 2019 13:50:42 +0000 (UTC) Subject: Re: [PATCH] mm/page_alloc: cleanup __alloc_pages_direct_compact() To: Pengfei Li , akpm@linux-foundation.org Cc: mhocko@suse.com, osalvador@suse.de, pavel.tatashin@microsoft.com, mgorman@techsingularity.net, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20190817105102.11732-1-lpf.vector@gmail.com> From: Vlastimil Babka Openpgp: preference=signencrypt Autocrypt: addr=vbabka@suse.cz; prefer-encrypt=mutual; keydata= mQINBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy 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5ZFJyfGsOiNUcMoO/17FO4EBxSDP3FDLllpuzlFD7SXkfJaMWYmXIlO0jLzdfwfcnDzBbPwO hBM8hvtsyq8lq8vJOxv6XD6xcTtj5Az8t2JjdUX6SF9hxJpwhBU0wrCoGDkWp4Bbv6jnF7zP Nzftr4l8RuJoywDIiJpdaNpSlXKpj/K6KrnyAI/joYc7 Message-ID: Date: Mon, 19 Aug 2019 15:50:41 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20190817105102.11732-1-lpf.vector@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 8/17/19 12:51 PM, Pengfei Li wrote: > This patch cleans up the if(page). > > No functional change. > > Signed-off-by: Pengfei Li I don't see much benefit here. The indentation wasn't that bad that it had to be reduced using goto. But the patch is not incorrect so I'm not NACKing. > --- > mm/page_alloc.c | 28 ++++++++++++++++------------ > 1 file changed, 16 insertions(+), 12 deletions(-) > > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index 272c6de1bf4e..51f056ac09f5 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -3890,6 +3890,7 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order, > enum compact_priority prio, enum compact_result *compact_result) > { > struct page *page = NULL; > + struct zone *zone; > unsigned long pflags; > unsigned int noreclaim_flag; > > @@ -3911,23 +3912,26 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order, > */ > count_vm_event(COMPACTSTALL); > > - /* Prep a captured page if available */ > - if (page) > + if (page) { > + /* Prep a captured page if available */ > prep_new_page(page, order, gfp_mask, alloc_flags); > - > - /* Try get a page from the freelist if available */ > - if (!page) > + } else { > + /* Try get a page from the freelist if available */ > page = get_page_from_freelist(gfp_mask, order, alloc_flags, ac); > > - if (page) { > - struct zone *zone = page_zone(page); > - > - zone->compact_blockskip_flush = false; > - compaction_defer_reset(zone, order, true); > - count_vm_event(COMPACTSUCCESS); > - return page; > + if (!page) > + goto failed; > } > > + zone = page_zone(page); > + zone->compact_blockskip_flush = false; > + compaction_defer_reset(zone, order, true); > + > + count_vm_event(COMPACTSUCCESS); > + > + return page; > + > +failed: > /* > * It's bad if compaction run occurs and fails. The most likely reason > * is that pages exist, but not enough to satisfy watermarks. >