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McKenney" , Matthew Wilcox , Laurent Dufour , David Rientjes , Axel Rasmussen , Suren Baghdasaryan , Vlastimil Babka , Rik van Riel , Peter Zijlstra , Michel Lespinasse , Jerome Glisse , Minchan Kim , Joel Fernandes , Rom Lemarchand , Liam Howlett Subject: [PATCH v4 49/66] bpf: Remove VMA linked list Thread-Topic: [PATCH v4 49/66] bpf: Remove VMA linked list Thread-Index: AQHX5r/zsqb9vHBNtU608kZJnpd2mg== Date: Wed, 1 Dec 2021 14:30:12 +0000 Message-ID: <20211201142918.921493-50-Liam.Howlett@oracle.com> References: <20211201142918.921493-1-Liam.Howlett@oracle.com> In-Reply-To: <20211201142918.921493-1-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 x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 6a6c9ec5-c44f-45d3-3c2e-08d9b4d725f7 x-ms-traffictypediagnostic: SA2PR10MB4508: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:5516; x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; 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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: SN6PR10MB3022.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 6a6c9ec5-c44f-45d3-3c2e-08d9b4d725f7 X-MS-Exchange-CrossTenant-originalarrivaltime: 01 Dec 2021 14:30:12.6558 (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: Re0KYH+ixES+d+JcQQ/m0EkyTg1og2ISR66HoqW3KFLq7Ig8NqZkDkTGgm6cGuK69mA9+KnvbZ9E/UddDi/RPg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA2PR10MB4508 X-Proofpoint-Virus-Version: vendor=nai engine=6300 definitions=10184 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 spamscore=0 adultscore=0 bulkscore=0 malwarescore=0 mlxlogscore=999 mlxscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2112010081 X-Proofpoint-ORIG-GUID: f7n75AJnNdZ2TW_feURL8qBdnl1wX2Jn X-Proofpoint-GUID: f7n75AJnNdZ2TW_feURL8qBdnl1wX2Jn Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Liam R. Howlett" Use vma_next() and remove reference to the start of the linked list Signed-off-by: Liam R. Howlett --- kernel/bpf/task_iter.c | 21 ++++----------------- 1 file changed, 4 insertions(+), 17 deletions(-) diff --git a/kernel/bpf/task_iter.c b/kernel/bpf/task_iter.c index b48750bfba5a..2d964743f1e6 100644 --- a/kernel/bpf/task_iter.c +++ b/kernel/bpf/task_iter.c @@ -299,8 +299,8 @@ struct bpf_iter_seq_task_vma_info { }; =20 enum bpf_task_vma_iter_find_op { - task_vma_iter_first_vma, /* use mm->mmap */ - task_vma_iter_next_vma, /* use curr_vma->vm_next */ + task_vma_iter_first_vma, /* use find_vma() with addr 0 */ + task_vma_iter_next_vma, /* use vma_next() with curr_vma */ task_vma_iter_find_vma, /* use find_vma() to find next vma */ }; =20 @@ -400,24 +400,11 @@ task_vma_seq_get_next(struct bpf_iter_seq_task_vma_in= fo *info) =20 switch (op) { case task_vma_iter_first_vma: - curr_vma =3D curr_task->mm->mmap; + curr_vma =3D find_vma(curr_task->mm, 0); break; case task_vma_iter_next_vma: - curr_vma =3D curr_vma->vm_next; - break; case task_vma_iter_find_vma: - /* We dropped mmap_lock so it is necessary to use find_vma - * to find the next vma. This is similar to the mechanism - * in show_smaps_rollup(). - */ - curr_vma =3D find_vma(curr_task->mm, info->prev_vm_end - 1); - /* case 1) and 4.2) above just use curr_vma */ - - /* check for case 2) or case 4.1) above */ - if (curr_vma && - curr_vma->vm_start =3D=3D info->prev_vm_start && - curr_vma->vm_end =3D=3D info->prev_vm_end) - curr_vma =3D curr_vma->vm_next; + curr_vma =3D find_vma(curr_task->mm, curr_vma->vm_end); break; } if (!curr_vma) { --=20 2.30.2