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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1A7EFC433EF for ; Tue, 8 Mar 2022 16:13:51 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 68CD78D0002; Tue, 8 Mar 2022 11:13:51 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 63C118D0001; Tue, 8 Mar 2022 11:13:51 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4DD778D0002; Tue, 8 Mar 2022 11:13:51 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (relay.hostedemail.com [64.99.140.28]) by kanga.kvack.org (Postfix) with ESMTP id 3BA608D0001 for ; Tue, 8 Mar 2022 11:13:51 -0500 (EST) Received: from smtpin01.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 0DF7360533 for ; Tue, 8 Mar 2022 16:13:51 +0000 (UTC) X-FDA: 79221715062.01.8891A1C Received: from mail-io1-f41.google.com (mail-io1-f41.google.com [209.85.166.41]) by imf10.hostedemail.com (Postfix) with ESMTP id 491F8C0016 for ; Tue, 8 Mar 2022 16:13:50 +0000 (UTC) Received: by mail-io1-f41.google.com with SMTP id x4so6579832iop.7 for ; Tue, 08 Mar 2022 08:13:50 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=OiqyeB0b6J0rfF+qZiyPdJHBNMRJKO0i7S5FsGcKn6U=; b=XV5SY7AUcNGte67CfprtVmA96ldB7oeU5fjiJMSAR8oUsj6uYm8+zChb1wH/xWFrPB FcU6co3XqkCnEMqn7KrqicBBfd24KDXtBW+1tVmEy4CPYg9v17AT14fEts0W+FqrcLmu WISUge0U5Bd+zdwFBezQBVrGQtq41bdp9PZZsz8gb8kDoy1DaZahqCA34b9NAIE2Czun FHUwlM5h7O+/GKflV5A3JunztaI9yRbeDz1fGkAzvbef3N0D3G3RjTrKAhcy/HREef5X KFZ+7yXYFLhI6Hj7kBqeitsxASQ7UR+fh+luc2zHfeNOPjevt6hj5fLiRHOpvImNG6nf wDVw== X-Gm-Message-State: AOAM533C6q7VBW+WV1tll0+zCjTsRsNKmt96CpI+mzuaia6RkehJZLnd MlDfewGsBSohwhoNnRoUd7g= X-Google-Smtp-Source: ABdhPJxytH+Vzy+XUhqK4aPlSOSdpfI/yqmuWdQLh4Blw4P30hNSOKPzT3mOi/OUY1LF78hwilclag== X-Received: by 2002:a05:6638:3012:b0:317:9a63:ecd3 with SMTP id r18-20020a056638301200b003179a63ecd3mr16838924jak.210.1646756028135; Tue, 08 Mar 2022 08:13:48 -0800 (PST) Received: from fedora (216-241-34-136.static.forethought.net. [216.241.34.136]) by smtp.gmail.com with ESMTPSA id x7-20020a056e021ca700b002c5f9136a2dsm12453334ill.36.2022.03.08.08.13.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Mar 2022 08:13:47 -0800 (PST) Date: Tue, 8 Mar 2022 11:13:44 -0500 From: Dennis Zhou To: Paolo Bonzini Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Michael Ellerman , Andrew Morton , Tejun Heo , Christoph Lameter , Johannes Weiner , Michal Hocko , Vladimir Davydov , linux-mm@kvack.org, cgroups@vger.kernel.org Subject: Re: [PATCH 2/3] mm: use vmalloc_array and vcalloc for array allocations Message-ID: References: <20220308105918.615575-1-pbonzini@redhat.com> <20220308105918.615575-3-pbonzini@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220308105918.615575-3-pbonzini@redhat.com> X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 491F8C0016 X-Stat-Signature: hth39yjwthbgbye6w3dhpb9r8j35iqje Authentication-Results: imf10.hostedemail.com; dkim=none; spf=pass (imf10.hostedemail.com: domain of dennisszhou@gmail.com designates 209.85.166.41 as permitted sender) smtp.mailfrom=dennisszhou@gmail.com; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=kernel.org (policy=none) X-Rspam-User: X-HE-Tag: 1646756030-952669 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: Hello, On Tue, Mar 08, 2022 at 05:59:17AM -0500, Paolo Bonzini wrote: > Instead of using array_size or just a multiply, use a function that > takes care of both the multiplication and the overflow checks. > > Cc: linux-mm@kvack.org > Signed-off-by: Paolo Bonzini > --- > mm/percpu-stats.c | 2 +- > mm/swap_cgroup.c | 4 +--- > 2 files changed, 2 insertions(+), 4 deletions(-) > > diff --git a/mm/percpu-stats.c b/mm/percpu-stats.c > index c6bd092ff7a3..e71651cda2de 100644 > --- a/mm/percpu-stats.c > +++ b/mm/percpu-stats.c > @@ -144,7 +144,7 @@ static int percpu_stats_show(struct seq_file *m, void *v) > spin_unlock_irq(&pcpu_lock); > > /* there can be at most this many free and allocated fragments */ > - buffer = vmalloc(array_size(sizeof(int), (2 * max_nr_alloc + 1))); > + buffer = vmalloc_array(2 * max_nr_alloc + 1, sizeof(int)); > if (!buffer) > return -ENOMEM; > > diff --git a/mm/swap_cgroup.c b/mm/swap_cgroup.c > index 7f34343c075a..5a9442979a18 100644 > --- a/mm/swap_cgroup.c > +++ b/mm/swap_cgroup.c > @@ -167,14 +167,12 @@ unsigned short lookup_swap_cgroup_id(swp_entry_t ent) > int swap_cgroup_swapon(int type, unsigned long max_pages) > { > void *array; > - unsigned long array_size; > unsigned long length; > struct swap_cgroup_ctrl *ctrl; > > length = DIV_ROUND_UP(max_pages, SC_PER_PAGE); > - array_size = length * sizeof(void *); > > - array = vzalloc(array_size); > + array = vcalloc(length, sizeof(void *)); > if (!array) > goto nomem; > > -- > 2.31.1 > Acked-by: Dennis Zhou Thanks, Dennis