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| author | Liam R. Howlett <Liam.Howlett@Oracle.com> | 2024-08-30 06:00:49 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-09-04 06:15:50 +0200 |
| commit | 9014b230d88d7fc505ada416163b151be70b649a (patch) | |
| tree | a970721c93f63711181a981ed953995c56418953 /mm/mmap.c | |
| parent | mm/vma: inline munmap operation in mmap_region() (diff) | |
| download | linux-9014b230d88d7fc505ada416163b151be70b649a.tar.xz linux-9014b230d88d7fc505ada416163b151be70b649a.zip | |
mm/vma: expand mmap_region() munmap call
Open code the do_vmi_align_munmap() call so that it can be broken up later
in the series.
This requires exposing a few more vma operations.
Link: https://lkml.kernel.org/r/20240830040101.822209-10-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Bert Karwatzki <spasswolf@web.de>
Cc: Jeff Xu <jeffxu@chromium.org>
Cc: Jiri Olsa <olsajiri@gmail.com>
Cc: Kees Cook <kees@kernel.org>
Cc: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Paul Moore <paul@paul-moore.com>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/mmap.c')
| -rw-r--r-- | mm/mmap.c | 26 |
1 files changed, 22 insertions, 4 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index ec72f05b05f2..84cb4b1df4a2 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1366,6 +1366,9 @@ unsigned long mmap_region(struct file *file, unsigned long addr, struct vm_area_struct *next, *prev, *merge; pgoff_t pglen = len >> PAGE_SHIFT; unsigned long charged = 0; + struct vma_munmap_struct vms; + struct ma_state mas_detach; + struct maple_tree mt_detach; unsigned long end = addr + len; unsigned long merge_start = addr, merge_end = end; bool writable_file_mapping = false; @@ -1391,11 +1394,28 @@ unsigned long mmap_region(struct file *file, unsigned long addr, /* Find the first overlapping VMA */ vma = vma_find(&vmi, end); if (vma) { - /* Unmap any existing mapping in the area */ - error = do_vmi_align_munmap(&vmi, vma, mm, addr, end, uf, false); + mt_init_flags(&mt_detach, vmi.mas.tree->ma_flags & MT_FLAGS_LOCK_MASK); + mt_on_stack(mt_detach); + mas_init(&mas_detach, &mt_detach, /* addr = */ 0); + init_vma_munmap(&vms, &vmi, vma, addr, end, uf, /* unlock = */ false); + /* Prepare to unmap any existing mapping in the area */ + error = vms_gather_munmap_vmas(&vms, &mas_detach); if (error) return error; + + /* Remove any existing mappings from the vma tree */ + if (vma_iter_clear_gfp(&vmi, addr, end, GFP_KERNEL)) + return -ENOMEM; + + /* Unmap any existing mapping in the area */ + vms_complete_munmap_vmas(&vms, &mas_detach); + next = vms.next; + prev = vms.prev; + vma_prev(&vmi); vma = NULL; + } else { + next = vma_next(&vmi); + prev = vma_prev(&vmi); } /* @@ -1408,8 +1428,6 @@ unsigned long mmap_region(struct file *file, unsigned long addr, vm_flags |= VM_ACCOUNT; } - next = vma_next(&vmi); - prev = vma_prev(&vmi); if (vm_flags & VM_SPECIAL) { if (prev) vma_iter_next_range(&vmi); |