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a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=xqWC_Br6kY4A:10 a=dt9VzEwgFbYA:10 a=GoEa3M9JfhUA:10 a=yPCof4ZbAAAA:8 a=KWrF3PiNL9PbMbJVJAMA:9 X-Proofpoint-GUID: ejY946-6Z88RW-I00PnO0mZHCMYKkvde X-Proofpoint-ORIG-GUID: ejY946-6Z88RW-I00PnO0mZHCMYKkvde X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNTAxMDEzMiBTYWx0ZWRfX5nl3Q5ATJ+d4 LzrWlmy31LXy5I29QHakh4ID1g7L/nARFEdcptrZzHttSX0bgO5R9a4CbQ79fd2+UgkECzD4kvV 874bN23gda6uX8hFoJU/Dhmq3KMlMS5SNe2ku4lcvvjkNusbPdW8fpq3/O5Ue/YJ+GK3IzUdlGx iOaHZMiWoMyz9pdoykvaoJ70n70+giRke1hEFHUxh3Yu4hh/UNifn1B7u76sIsAKnuMS4bNjPOt Nihsj6IYMuELVeinLCZcrKwjnwypxLxDktRLnX2/zCJtcTTIfw4N4qVjTHsbKyMh1hS2CuxT08U wDbzcJSeDmL6ST3jvp6LEtPHSBtYO57Hm3jc32Lpt+H6jOR0mdjB5AONxNCw8LiX8YbkjGnVlXE l7eeUQ046/uuzqiHJjvBIeZV6G7pMtBoz/EujLOyLijIAsWnbQ4sY++pYgvRD2FPsiWMgBTM Content-Type: text/plain; charset="utf-8" We have now introduced a mechanism that obviates the need for a reattempted merge via the mmap_prepare() file hook, so eliminate this functionality altogether. The retry merge logic has been the cause of a great deal of complexity in the past and required a great deal of careful manoeuvring of code to ensure its continued and correct functionality. It has also recently been involved in an issue surrounding maple tree state, which again points to its problematic nature. We make it much easier to reason about mmap() logic by eliminating this and simply writing a VMA once. This also opens the doors to future optimisation and improvement in the mmap() logic. For any device or file system which encounters unwanted VMA fragmentation as a result of this change (that is, having not implemented .mmap_prepare hooks), the issue is easily resolvable by doing so. Signed-off-by: Lorenzo Stoakes --- mm/vma.c | 14 -------------- 1 file changed, 14 deletions(-) diff --git a/mm/vma.c b/mm/vma.c index acd5b98fe087..95696eb44365 100644 --- a/mm/vma.c +++ b/mm/vma.c @@ -24,7 +24,6 @@ struct mmap_state { void *vm_private_data; =20 unsigned long charged; - bool retry_merge; =20 struct vm_area_struct *prev; struct vm_area_struct *next; @@ -2417,8 +2416,6 @@ static int __mmap_new_file_vma(struct mmap_state *map, !(map->flags & VM_MAYWRITE) && (vma->vm_flags & VM_MAYWRITE)); =20 - /* If the flags change (and are mergeable), let's retry later. */ - map->retry_merge =3D vma->vm_flags !=3D map->flags && !(vma->vm_flags & V= M_SPECIAL); map->flags =3D vma->vm_flags; =20 return 0; @@ -2624,17 +2621,6 @@ static unsigned long __mmap_region(struct file *file= , unsigned long addr, if (have_mmap_prepare) set_vma_user_defined_fields(vma, &map); =20 - /* If flags changed, we might be able to merge, so try again. */ - if (map.retry_merge) { - struct vm_area_struct *merged; - VMG_MMAP_STATE(vmg, &map, vma); - - vma_iter_config(map.vmi, map.addr, map.end); - merged =3D vma_merge_existing_range(&vmg); - if (merged) - vma =3D merged; - } - __mmap_complete(&map, vma); =20 return addr; --=20 2.49.0