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[209.132.180.67]) by mx.google.com with ESMTP id j10-v6si11709348pgq.503.2018.06.18.03.03.46; Mon, 18 Jun 2018 03:03:59 -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 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935167AbeFRISf (ORCPT + 99 others); Mon, 18 Jun 2018 04:18:35 -0400 Received: from smtp.ctxuk.citrix.com ([185.25.65.24]:36024 "EHLO SMTP.EU.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935027AbeFRIS3 (ORCPT ); Mon, 18 Jun 2018 04:18:29 -0400 X-IronPort-AV: E=Sophos;i="5.51,238,1526342400"; d="scan'208";a="74814882" Subject: Re: [Xen-devel] [PATCH v2] xen: add new hypercall buffer mapping device To: Juergen Gross , , CC: References: <20180618073639.26066-1-jgross@suse.com> From: Andrew Cooper Openpgp: preference=signencrypt Autocrypt: addr=andrew.cooper3@citrix.com; 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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 MIME-Version: 1.0 In-Reply-To: <20180618073639.26066-1-jgross@suse.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Content-Language: en-GB X-ClientProxiedBy: AMSPEX02CAS01.citrite.net (10.69.22.112) To AMSPEX02CL02.citrite.net (10.69.22.126) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 18/06/18 15:36, Juergen Gross wrote: > +static int privcmd_buf_mmap(struct file *file, struct vm_area_struct *vma) > +{ > + struct privcmd_buf_private *file_priv = file->private_data; > + struct privcmd_buf_vma_private *vma_priv; > + unsigned long count = vma_pages(vma); > + unsigned int i; > + int ret = 0; > + > + if (!(vma->vm_flags & VM_SHARED) || count > (unsigned long)limit || You don't need the unsigned long cast, as limit will be promoted automatically. Otherwise, LGTM. ~Andrew