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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 21/22] mm/memory.c: Use vma_lookup() in __access_remote_vm() Thread-Topic: [PATCH 21/22] mm/memory.c: Use vma_lookup() in __access_remote_vm() Thread-Index: AQHXRb3FmA6JsZrK70u9LfF8sV3q5Q== Date: Mon, 10 May 2021 16:58:59 +0000 Message-ID: <20210510165839.2692974-22-Liam.Howlett@Oracle.com> References: <20210510165839.2692974-1-Liam.Howlett@Oracle.com> In-Reply-To: <20210510165839.2692974-1-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: 9f40e653-a33e-4178-e7a2-08d913d4e7b8 x-ms-traffictypediagnostic: MWHPR10MB1437: 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: 9f40e653-a33e-4178-e7a2-08d913d4e7b8 X-MS-Exchange-CrossTenant-originalarrivaltime: 10 May 2021 16:58:59.0185 (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: wcxtQv0ck3RQbFqzDIOYf0p61e1kQEa4/CsI1ZVB/r2OsO5ZUz4Sb1dzzrbUioj4dilo70kLCyz+gzrReC60rg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR10MB1437 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9980 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 suspectscore=0 mlxlogscore=999 adultscore=0 spamscore=0 mlxscore=0 bulkscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2105100114 X-Proofpoint-GUID: QFc1nZKpQGi0wQbV1wY41xfn8U5K-nhM X-Proofpoint-ORIG-GUID: QFc1nZKpQGi0wQbV1wY41xfn8U5K-nhM X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9980 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 priorityscore=1501 suspectscore=0 clxscore=1015 bulkscore=0 adultscore=0 impostorscore=0 spamscore=0 phishscore=0 mlxlogscore=999 mlxscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2105100114 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Use vma_lookup() to find the VMA at a specific address. As vma_lookup() will return NULL if the address is not within any VMA, the start address no longer needs to be validated. Signed-off-by: Liam R. Howlett --- mm/memory.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/memory.c b/mm/memory.c index 86ba6c1f6821..e3b56903b111 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -4954,8 +4954,8 @@ int __access_remote_vm(struct mm_struct *mm, unsigned= long addr, void *buf, * Check if this is a VM_IO | VM_PFNMAP VMA, which * we can access using slightly different code. */ - vma =3D find_vma(mm, addr); - if (!vma || vma->vm_start > addr) + vma =3D vma_lookup(mm, addr); + if (!vma) break; if (vma->vm_ops && vma->vm_ops->access) ret =3D vma->vm_ops->access(vma, addr, buf, --=20 2.30.2