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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 40/66] exec: Use VMA iterator instead of linked list Thread-Topic: [PATCH v4 40/66] exec: Use VMA iterator instead of linked list Thread-Index: AQHX5r/xeY0gQmeZr0+LO7hmfQvN0Q== Date: Wed, 1 Dec 2021 14:30:09 +0000 Message-ID: <20211201142918.921493-41-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: 036f19a7-6038-43ab-5371-08d9b4d724e7 x-ms-traffictypediagnostic: SA2PR10MB4508: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:7691; 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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: 036f19a7-6038-43ab-5371-08d9b4d724e7 X-MS-Exchange-CrossTenant-originalarrivaltime: 01 Dec 2021 14:30:09.0978 (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: 574cvWF15tixcFudUJzI6kPvz/jFRHcrJh9/90583zkLzZkxxQDqnRadfy27dr2SWDO6KkcuQ+qN0iEHmtB9hQ== 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: XVgD2RQh1yGZMHby76tdzLwVM629lErh X-Proofpoint-GUID: XVgD2RQh1yGZMHby76tdzLwVM629lErh Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Liam R. Howlett" Remove a use of the vm_next list by doing the initial lookup with the VMA iterator and then using it to find the next entry. Signed-off-by: Matthew Wilcox (Oracle) Signed-off-by: Liam R. Howlett --- fs/exec.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/fs/exec.c b/fs/exec.c index fee18b63ed35..f033745c148a 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -680,6 +680,8 @@ static int shift_arg_pages(struct vm_area_struct *vma, = unsigned long shift) unsigned long length =3D old_end - old_start; unsigned long new_start =3D old_start - shift; unsigned long new_end =3D old_end - shift; + VMA_ITERATOR(vmi, mm, new_start); + struct vm_area_struct *next; struct mmu_gather tlb; =20 BUG_ON(new_start > new_end); @@ -688,7 +690,7 @@ static int shift_arg_pages(struct vm_area_struct *vma, = unsigned long shift) * ensure there are no vmas between where we want to go * and where we are */ - if (vma !=3D find_vma(mm, new_start)) + if (vma !=3D vma_next(&vmi)) return -EFAULT; =20 /* @@ -707,12 +709,13 @@ static int shift_arg_pages(struct vm_area_struct *vma= , unsigned long shift) =20 lru_add_drain(); tlb_gather_mmu(&tlb, mm); + next =3D vma_next(&vmi); if (new_end > old_start) { /* * when the old and new regions overlap clear from new_end. */ free_pgd_range(&tlb, new_end, old_end, new_end, - vma->vm_next ? vma->vm_next->vm_start : USER_PGTABLES_CEILING); + next ? next->vm_start : USER_PGTABLES_CEILING); } else { /* * otherwise, clean from old_start; this is done to not touch @@ -721,7 +724,7 @@ static int shift_arg_pages(struct vm_area_struct *vma, = unsigned long shift) * for the others its just a little faster. */ free_pgd_range(&tlb, old_start, old_end, new_end, - vma->vm_next ? vma->vm_next->vm_start : USER_PGTABLES_CEILING); + next ? next->vm_start : USER_PGTABLES_CEILING); } tlb_finish_mmu(&tlb); =20 --=20 2.30.2