From patchwork Tue Jun 2 04:49:19 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Morton X-Patchwork-Id: 11583117 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 589E460D for ; Tue, 2 Jun 2020 04:49:30 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 1DBAC20734 for ; Tue, 2 Jun 2020 04:49:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="qN8IpZlS" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1DBAC20734 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 C41AF280032; Tue, 2 Jun 2020 00:49:21 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id BF263280012; Tue, 2 Jun 2020 00:49:21 -0400 (EDT) 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 AB988280032; Tue, 2 Jun 2020 00:49:21 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0049.hostedemail.com [216.40.44.49]) by kanga.kvack.org (Postfix) with ESMTP id 903AE280012 for ; Tue, 2 Jun 2020 00:49:21 -0400 (EDT) Received: from smtpin10.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 65B3D180AD804 for ; Tue, 2 Jun 2020 04:49:21 +0000 (UTC) X-FDA: 76883042922.10.print95_3488b085ade5a Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin10.hostedemail.com (Postfix) with ESMTP id 450D016A07E for ; Tue, 2 Jun 2020 04:49:21 +0000 (UTC) X-Spam-Summary: 2,0,0,aab1e586b7ddb57a,d41d8cd98f00b204,akpm@linux-foundation.org,,RULES_HIT:41:355:379:800:960:967:973:988:989:1260:1263:1345:1359:1381:1431:1437:1534:1541:1711:1714:1730:1747:1777:1792:2393:2525:2559:2563:2682:2685:2859:2902:2933:2937:2939:2942:2945:2947:2951:2954:3022:3138:3139:3140:3141:3142:3351:3865:3866:3867:3868:3934:3936:3938:3941:3944:3947:3950:3953:3956:3959:4321:5007:6119:6261:6653:7576:8599:9025:9545:10004:10913:11026:11473:11658:11914:12043:12048:12297:12517:12519:12555:12679:12783:12986:13069:13311:13357:13846:14181:14384:14721:14849:21080:21451:21627:21740:21939:30012:30054:30064,0,RBL:198.145.29.99:@linux-foundation.org:.lbl8.mailshell.net-62.2.0.100 64.100.201.201,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fp,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:31,LUA_SUMMARY:none X-HE-Tag: print95_3488b085ade5a X-Filterd-Recvd-Size: 2475 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf34.hostedemail.com (Postfix) with ESMTP for ; Tue, 2 Jun 2020 04:49:20 +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 EF7A8206C3; Tue, 2 Jun 2020 04:49:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591073360; bh=XsxHgW9Ai6tTX/0JtKNyoV/Fpm9L3b7XJIBM5Cy/hZo=; h=Date:From:To:Subject:In-Reply-To:From; b=qN8IpZlSMeQsJp3QREBf30bzYP8+zQRErCswMBOORsG0DpZLacMoCd9y7B4Fqui75 68ark1T4+ayoCtdmBKE8PvcAb9F+RLE43Aexh/BdWesHXkUcAaH2P7SV2EZRvqT5w8 mcvK6nry+TQFS753EWwmNm803iF1K666eCfuR9t4= Date: Mon, 01 Jun 2020 21:49:19 -0700 From: Andrew Morton To: akpm@linux-foundation.org, hughd@google.com, linux-mm@kvack.org, mhocko@suse.com, minchan@kernel.org, mm-commits@vger.kernel.org, tim.c.chen@linux.intel.com, torvalds@linux-foundation.org, ying.huang@intel.com Subject: [patch 072/128] mm/swapfile.c: use prandom_u32_max() Message-ID: <20200602044919.X2xGegOOR%akpm@linux-foundation.org> In-Reply-To: <20200601214457.919c35648e96a2b46b573fe1@linux-foundation.org> User-Agent: s-nail v14.8.16 X-Rspamd-Queue-Id: 450D016A07E X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam05 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: Huang Ying Subject: mm/swapfile.c: use prandom_u32_max() To improve the code readability and take advantage of the common implementation. Link: http://lkml.kernel.org/r/20200512081013.520201-1-ying.huang@intel.com Signed-off-by: "Huang, Ying" Acked-by: Michal Hocko Cc: Minchan Kim Cc: Tim Chen Cc: Hugh Dickins Signed-off-by: Andrew Morton --- mm/swapfile.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/mm/swapfile.c~mm-swap-use-prandom_u32_max +++ a/mm/swapfile.c @@ -3209,7 +3209,7 @@ SYSCALL_DEFINE2(swapon, const char __use * select a random position to start with to help wear leveling * SSD */ - p->cluster_next = 1 + (prandom_u32() % p->highest_bit); + p->cluster_next = 1 + prandom_u32_max(p->highest_bit); nr_cluster = DIV_ROUND_UP(maxpages, SWAPFILE_CLUSTER); cluster_info = kvcalloc(nr_cluster, sizeof(*cluster_info),