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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: 28dbfbfe-8805-494b-560b-08d9f091978b X-MS-Exchange-CrossTenant-originalarrivaltime: 15 Feb 2022 14:43:19.0419 (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: HG4fpAuGHBatg5V7LemUm+BSk8dPdhKpJU7cQdCIM/j+cH4z7SWzuGSUxVwWRmi5oqqaiDxdh4oDpWZpYjWMMg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CO1PR10MB4689 X-Proofpoint-Virus-Version: vendor=nai engine=6300 definitions=10258 signatures=673431 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 mlxlogscore=999 bulkscore=0 spamscore=0 adultscore=0 mlxscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2202150085 X-Proofpoint-ORIG-GUID: x_YbtLSrQT3MGVcw89Ah-j0pkUBFP-pr X-Proofpoint-GUID: x_YbtLSrQT3MGVcw89Ah-j0pkUBFP-pr 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 0c34b17932fb..e9fa3dd46a14 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -681,6 +681,8 @@ 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); @@ -689,7 +691,7 @@ 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 /* @@ -708,12 +710,13 @@ 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 @@ -722,7 +725,7 @@ 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 2.34.1