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Mon, 14 Jan 2019 23:31:16 +0000 Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userv0022.oracle.com (8.14.4/8.14.4) with ESMTP id x0ENVFN4015680 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 14 Jan 2019 23:31:16 GMT Received: from abhmp0010.oracle.com (abhmp0010.oracle.com [141.146.116.16]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id x0ENVFvP030648; Mon, 14 Jan 2019 23:31:15 GMT Received: from dhcp-burlington7-2nd-B-east-10-152-55-162.usdhcp.oraclecorp.com (/10.152.32.65) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 14 Jan 2019 15:31:15 -0800 Subject: Re: [PATCH 9/9] xen/privcmd-buf.c: Convert to use vm_insert_range_buggy To: Souptick Joarder , akpm@linux-foundation.org, willy@infradead.org, mhocko@suse.com, jgross@suse.com, linux@armlinux.org.uk, robin.murphy@arm.com Cc: xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org References: <20190111151326.GA2853@jordon-HP-15-Notebook-PC> From: Boris Ostrovsky Openpgp: preference=signencrypt Autocrypt: addr=boris.ostrovsky@oracle.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.1 MIME-Version: 1.0 In-Reply-To: <20190111151326.GA2853@jordon-HP-15-Notebook-PC> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9136 signatures=668680 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=2 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1901140180 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 1/11/19 10:13 AM, Souptick Joarder wrote: > Convert to use vm_insert_range_buggy() to map range of kernel > memory to user vma. > > This driver has ignored vm_pgoff. We could later "fix" these drivers > to behave according to the normal vm_pgoff offsetting simply by > removing the _buggy suffix on the function name and if that causes > regressions, it gives us an easy way to revert. > > Signed-off-by: Souptick Joarder > --- > drivers/xen/privcmd-buf.c | 8 ++------ > 1 file changed, 2 insertions(+), 6 deletions(-) > > diff --git a/drivers/xen/privcmd-buf.c b/drivers/xen/privcmd-buf.c > index de01a6d..a9d7e97 100644 > --- a/drivers/xen/privcmd-buf.c > +++ b/drivers/xen/privcmd-buf.c > @@ -166,12 +166,8 @@ static int privcmd_buf_mmap(struct file *file, struct vm_area_struct *vma) > if (vma_priv->n_pages != count) > ret = -ENOMEM; > else > - for (i = 0; i < vma_priv->n_pages; i++) { > - ret = vm_insert_page(vma, vma->vm_start + i * PAGE_SIZE, > - vma_priv->pages[i]); > - if (ret) > - break; > - } > + ret = vm_insert_range_buggy(vma, vma_priv->pages, > + vma_priv->n_pages); This can use the non-buggy version. But since the original code was indeed buggy in this respect I can submit this as a separate patch later. So Reviewed-by: Boris Ostrovsky > > if (ret) > privcmd_buf_vmapriv_free(vma_priv);