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McKenney" , Matthew Wilcox , David Rientjes , Axel Rasmussen , Suren Baghdasaryan , Vlastimil Babka , Rik van Riel , Peter Zijlstra Subject: [PATCH v3 45/66] kernel/fork: Use maple tree iterators instead of linked list Thread-Topic: [PATCH v3 45/66] kernel/fork: Use maple tree iterators instead of linked list Thread-Index: AQHXuYipxj3truUFLEWKF2FLqcXjvw== Date: Tue, 5 Oct 2021 01:31:03 +0000 Message-ID: <20211005012959.1110504-46-Liam.Howlett@oracle.com> References: <20211005012959.1110504-1-Liam.Howlett@oracle.com> In-Reply-To: <20211005012959.1110504-1-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-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 77bab529-c5ad-4dff-ceaf-08d9879fd7aa x-ms-traffictypediagnostic: BLAPR10MB5044: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:1303; 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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: BL0PR10MB3011.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 77bab529-c5ad-4dff-ceaf-08d9879fd7aa X-MS-Exchange-CrossTenant-originalarrivaltime: 05 Oct 2021 01:31:03.6315 (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: QRzqJfyN6END20HDF4aAbORKzPv2K/Y0UdMIWjY0YGLzibwgCHQIFABKT9bJAbdHiwCGEmVdIvYjuI5oYVvYcQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BLAPR10MB5044 X-Proofpoint-Virus-Version: vendor=nai engine=6300 definitions=10127 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 mlxlogscore=999 adultscore=0 bulkscore=0 suspectscore=0 malwarescore=0 spamscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2109230001 definitions=main-2110050007 X-Proofpoint-GUID: PMrOieIUVl8ga38ZoStl6uDOOmmL3kgi X-Proofpoint-ORIG-GUID: PMrOieIUVl8ga38ZoStl6uDOOmmL3kgi Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Liam R. Howlett" Signed-off-by: Liam R. Howlett --- kernel/fork.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/kernel/fork.c b/kernel/fork.c index 3c14f8aef01a..d995ab62002b 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1229,14 +1229,19 @@ int replace_mm_exe_file(struct mm_struct *mm, struc= t file *new_exe_file) /* Forbid mm->exe_file change if old file still mapped. */ old_exe_file =3D get_mm_exe_file(mm); if (old_exe_file) { + MA_STATE(mas, &mm->mm_mt, 0, 0); mmap_read_lock(mm); - for (vma =3D mm->mmap; vma && !ret; vma =3D vma->vm_next) { + rcu_read_lock(); + mas_for_each(&mas, vma, ULONG_MAX) { if (!vma->vm_file) continue; if (path_equal(&vma->vm_file->f_path, - &old_exe_file->f_path)) + &old_exe_file->f_path)) { ret =3D -EBUSY; + break; + } } + rcu_read_unlock(); mmap_read_unlock(mm); fput(old_exe_file); if (ret) --=20 2.30.2