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X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: MASUfLiqEKXpsQheR4nH+P1X6yJdTPtPHsBI/+tDa7xgcL+IuQycskLFOr1YYU54WHh7JDQ+uvNHK9zzhHDABSGGWKAiUuTI796yae1E7Qw= X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR10MB6251 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.0.736,FMLib:17.12.80.40 definitions=2025-05-07_03,2025-05-06_01,2025-02-21_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 bulkscore=0 mlxlogscore=999 suspectscore=0 adultscore=0 phishscore=0 mlxscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2504070000 definitions=main-2505070103 X-Authority-Analysis: v=2.4 cv=Va/3PEp9 c=1 sm=1 tr=0 ts=681b3e2b cx=c_pps a=OOZaFjgC48PWsiFpTAqLcw==:117 a=OOZaFjgC48PWsiFpTAqLcw==:17 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=wKuvFiaSGQ0qltdbU6+NXLB8nM8=:19 a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=xqWC_Br6kY4A:10 a=dt9VzEwgFbYA:10 a=GoEa3M9JfhUA:10 a=yPCof4ZbAAAA:8 a=VwQbUJbxAAAA:8 a=Kl9-pRb9PRCpSRKwHLEA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNTA3MDEwMyBTYWx0ZWRfX3Reab0OARgVA ddWCEZhTLectSbva+Mt2dDz9SaY8LblJto/d8Ul1gmyiYQ+t65QgUVzIXNF9GAfXhINojvN6qZd QSkiNvRQYr8jxvMzg2ap6VInWUWAw2uTXuYELrzm2fH8wFUE/AHX9VCso+bJVUvpGLTLm21RbZB 6JWuFRoh6b5s6jquLsUDpX27hvwz4/QccQ7r0/GFBvDh/fkde5Q6SHyqweBmZwVAurpas/oSlDx Xq+pPlGmBz8+DoHCx/Zx1ZpjXzSxoanI6z5Okj/MdmALp+kjDYLq815K+jQGDDTgmYgYsxWQzv6 X7p7DrsY6SDq8u5bcXGLbK6Jo6O5uBVChcTtDrY3KNc/s/w51oD27HJGV0/Liu+2yf/Uj05nyEJ qX8/Swzk0BmjBmLfE1o490CVvSQpkq9QGyM6KDA1Okc/1TBThaV9qjgXkksW6fG5QNkjRqAn X-Proofpoint-ORIG-GUID: RETah_3L1phnkk4PKQjzOmDB1UHdNfrk X-Proofpoint-GUID: RETah_3L1phnkk4PKQjzOmDB1UHdNfrk Content-Type: text/plain; charset="utf-8" Secretmem has a simple .mmap() hook which is easily converted to the new .mmap_prepare() callback. Importantly, it's a rare instance of an driver that manipulates a VMA which is mergeable (that is, not a VM_SPECIAL mapping) while also adjusting VMA flags which may adjust mergeability, meaning the retry merge logic might impact whether or not the VMA is merged. By using .mmap_prepare() there's no longer any need to retry the merge later as we can simply set the correct flags from the start. This change therefore allows us to remove the retry merge logic in a subsequent commit. Signed-off-by: Lorenzo Stoakes Acked-by: Mike Rapoport (Microsoft) Acked-by: David Hildenbrand --- mm/secretmem.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/mm/secretmem.c b/mm/secretmem.c index 1b0a214ee558..f98cf3654974 100644 --- a/mm/secretmem.c +++ b/mm/secretmem.c @@ -120,18 +120,18 @@ static int secretmem_release(struct inode *inode, str= uct file *file) return 0; } =20 -static int secretmem_mmap(struct file *file, struct vm_area_struct *vma) +static int secretmem_mmap_prepare(struct vm_area_desc *desc) { - unsigned long len =3D vma->vm_end - vma->vm_start; + unsigned long len =3D desc->end - desc->start; =20 - if ((vma->vm_flags & (VM_SHARED | VM_MAYSHARE)) =3D=3D 0) + if ((desc->vm_flags & (VM_SHARED | VM_MAYSHARE)) =3D=3D 0) return -EINVAL; =20 - if (!mlock_future_ok(vma->vm_mm, vma->vm_flags | VM_LOCKED, len)) + if (!mlock_future_ok(desc->mm, desc->vm_flags | VM_LOCKED, len)) return -EAGAIN; =20 - vm_flags_set(vma, VM_LOCKED | VM_DONTDUMP); - vma->vm_ops =3D &secretmem_vm_ops; + desc->vm_flags |=3D VM_LOCKED | VM_DONTDUMP; + desc->vm_ops =3D &secretmem_vm_ops; =20 return 0; } @@ -143,7 +143,7 @@ bool vma_is_secretmem(struct vm_area_struct *vma) =20 static const struct file_operations secretmem_fops =3D { .release =3D secretmem_release, - .mmap =3D secretmem_mmap, + .mmap_prepare =3D secretmem_mmap_prepare, }; =20 static int secretmem_migrate_folio(struct address_space *mapping, --=20 2.49.0