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McKenney" , Matthew Wilcox , Laurent Dufour , David Rientjes , Axel Rasmussen , Suren Baghdasaryan , Vlastimil Babka , Rik van Riel , Peter Zijlstra , Michel Lespinasse , Liam Howlett Subject: [PATCH 35/94] xen/privcmd: Optimized privcmd_ioctl_mmap() by using vma_lookup() Thread-Topic: [PATCH 35/94] xen/privcmd: Optimized privcmd_ioctl_mmap() by using vma_lookup() Thread-Index: AQHXPEQ0lFso/sjA+0CVe97NQiFWlQ== Date: Wed, 28 Apr 2021 15:36:06 +0000 Message-ID: <20210428153542.2814175-36-Liam.Howlett@Oracle.com> References: <20210428153542.2814175-1-Liam.Howlett@Oracle.com> In-Reply-To: <20210428153542.2814175-1-Liam.Howlett@Oracle.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.30.2 authentication-results: lists.infradead.org; dkim=none (message not signed) header.d=none;lists.infradead.org; dmarc=none action=none header.from=oracle.com; x-originating-ip: [23.233.25.87] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 88660219-6cc5-40c3-004f-08d90a5b6931 x-ms-traffictypediagnostic: CO1PR10MB4769: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:6108; 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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MWHPR10MB1582.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 88660219-6cc5-40c3-004f-08d90a5b6931 X-MS-Exchange-CrossTenant-originalarrivaltime: 28 Apr 2021 15:36:06.9030 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: ARRajnKaP7rFJKcq5FMl6pU7S5pJfPLf407Tdlv16xWLgFPhlQfSwXgjXtgbTMoBPE/BpCpFMwKxYEiaQlwuKg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CO1PR10MB4769 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9968 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 bulkscore=0 mlxscore=0 malwarescore=0 phishscore=0 adultscore=0 mlxlogscore=999 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104060000 definitions=main-2104280101 X-Proofpoint-ORIG-GUID: ymWShi7aASu2HCj4lk7lB3pORD_7nUeK X-Proofpoint-GUID: ymWShi7aASu2HCj4lk7lB3pORD_7nUeK Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org vma_lookup() walks the VMA tree for a specific value, find_vma() will search the tree after walking to a specific value. It is more efficient to only walk to the requested value as this case requires the address to equal the vm_start. Signed-off-by: Liam R. Howlett --- drivers/xen/privcmd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c index 720a7b7abd46..5f903ae9af7e 100644 --- a/drivers/xen/privcmd.c +++ b/drivers/xen/privcmd.c @@ -282,7 +282,7 @@ static long privcmd_ioctl_mmap(struct file *file, void = __user *udata) struct page, lru); struct privcmd_mmap_entry *msg =3D page_address(page); =20 - vma =3D find_vma(mm, msg->va); + vma =3D vma_lookup(mm, msg->va); rc =3D -EINVAL; =20 if (!vma || (msg->va !=3D vma->vm_start) || vma->vm_private_data) --=20 2.30.2