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=-3.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 23333C433E0 for ; Tue, 2 Jun 2020 04:49:44 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id D995120772 for ; Tue, 2 Jun 2020 04:49:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="gwprwWC4" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D995120772 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id AE5A3280037; Tue, 2 Jun 2020 00:49:38 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id A6A1E280012; Tue, 2 Jun 2020 00:49:38 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 98188280037; Tue, 2 Jun 2020 00:49:38 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0024.hostedemail.com [216.40.44.24]) by kanga.kvack.org (Postfix) with ESMTP id 7D5C1280012 for ; Tue, 2 Jun 2020 00:49:38 -0400 (EDT) Received: from smtpin03.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 492B4824805A for ; Tue, 2 Jun 2020 04:49:38 +0000 (UTC) X-FDA: 76883043636.03.day18_36fb5d9e7dd5f Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin03.hostedemail.com (Postfix) with ESMTP id 12BCE28A4E8 for ; Tue, 2 Jun 2020 04:49:38 +0000 (UTC) X-HE-Tag: day18_36fb5d9e7dd5f X-Filterd-Recvd-Size: 2627 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf48.hostedemail.com (Postfix) with ESMTP for ; Tue, 2 Jun 2020 04:49:37 +0000 (UTC) Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 91685207FB; Tue, 2 Jun 2020 04:49:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591073376; bh=soWOeKWMpM7oZhnjQijf6QtMN64dRnQ8zv6J5plWryA=; h=Date:From:To:Subject:In-Reply-To:From; b=gwprwWC4fwOtBRwn62O4ZZe9p/VKOwjTMkISxBO0Kdi6YpMg8YrChOF7g6TV4DUN6 RVqlkS2GkDGgcfI6nlk/3apnZNZhPJ1Ey7Tr9ord72ENP0ZjMQku99fTJwQsLxiR2z IBCNoOww6PUpnx6fb9Sb0Fen+4W3U8CrqMtyTsi8= Date: Mon, 01 Jun 2020 21:49:36 -0700 From: Andrew Morton To: akpm@linux-foundation.org, hannes@cmpxchg.org, kaixuxia@tencent.com, linux-mm@kvack.org, mhocko@suse.com, mm-commits@vger.kernel.org, torvalds@linux-foundation.org, vdavydov.dev@gmail.com Subject: [patch 077/128] mm: memcontrol: simplify value comparison between count and limit Message-ID: <20200602044936.-L-Pa5sCj%akpm@linux-foundation.org> In-Reply-To: <20200601214457.919c35648e96a2b46b573fe1@linux-foundation.org> User-Agent: s-nail v14.8.16 X-Rspamd-Queue-Id: 12BCE28A4E8 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam01 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: From: Kaixu Xia Subject: mm: memcontrol: simplify value comparison between count and limit When the variables count and limit have the same value(count == limit), the result of min(margin, limit - count) statement should be 0 and the variable margin is set to 0. So in this case, the min() statement is not necessary and we can directly set the variable margin to 0. Link: http://lkml.kernel.org/r/1587479661-27237-1-git-send-email-kaixuxia@tencent.com Signed-off-by: Kaixu Xia Acked-by: Michal Hocko Cc: Johannes Weiner Cc: Vladimir Davydov Signed-off-by: Andrew Morton --- mm/memcontrol.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/mm/memcontrol.c~mm-memcontrol-simplify-value-comparison-between-count-and-limit +++ a/mm/memcontrol.c @@ -1314,7 +1314,7 @@ static unsigned long mem_cgroup_margin(s if (do_memsw_account()) { count = page_counter_read(&memcg->memsw); limit = READ_ONCE(memcg->memsw.max); - if (count <= limit) + if (count < limit) margin = min(margin, limit - count); else margin = 0; _