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There are two types of iterators mas and vmi in the current code. If the
maple tree comes from the mm structure, we can use the vma iterator.
Avoid using mas directly as possible.
Keep using mas for the mt_detach tree, since it doesn't come from the mm
structure.
Remove as many uses of mas as possible, but we will still have a few that
must be passed through in unmap_vmas() and free_pgtables().
Also introduce vma_iter_reset, vma_iter_{prev, next}_range_limit and
vma_iter_area_{lowest, highest} helper functions for using the vma
interator.
Link: https://lkml.kernel.org/r/20240325063258.1437618-1-yajun.deng@linux.dev
Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
Tested-by: Helge Deller <deller@gmx.de> [parisc]
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
d4e6b397be