[RESEND [PATCH] 2/2] mm/mmap.c: unlink vma before rb_erase

Current sequence to remove a vma is: vma_rb_erase_ignore() __vma_unlink_list() vma_gap_update() This may do some extra subtree_gap propagation due the vma is unlink from list after rb_erase. For example, we have a tree: a [0x9000, 0x1]

[PATCH 2/2] mm/mmap.c: unlink vma before rb_erase

Current sequence to remove a vma is: vma_rb_erase_ignore() __vma_unlink_list() vma_gap_update() This may do some extra subtree_gap propagation due the vma is unlink from list after rb_erase. For example, we have a tree: a [0x9000, 0x1]