From 1a8eb94fb40342ad62301784f2ae4c7daae0138c Mon Sep 17 00:00:00 2001 From: "Liam R. Howlett" Date: Fri, 24 Jul 2020 11:48:08 -0400 Subject: [PATCH] mm/mmap: Use the maple tree for find_vma_prev() instead of the rbtree Use the maple tree's advanced API and a maple state to walk the tree for the entry at the address or the next vma, then use the maple state to walk back one entry to find the previous entry. Note, the advanced maple tree interface does not handle the rcu locking. Add kernel documentation comments for this API. Signed-off-by: Liam R. Howlett --- mm/mmap.c | 27 +++++++++++++++++---------- 1 file changed, 17 insertions(+), 10 deletions(-) diff --git a/mm/mmap.c b/mm/mmap.c index fbf51fb56cbf..af03630387a6 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2507,23 +2507,30 @@ struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr) } EXPORT_SYMBOL(find_vma); -/* - * Same as find_vma, but also return a pointer to the previous VMA in *pprev. +/** + * find_vma_prev() - Find the VMA for a given address, or the next vma and + * set %pprev to the previous VMA, if any. + * @mm: The mm_struct to check + * @addr: The address + * @pprev: The pointer to set to the previous VMA + * + * Returns: The VMA associated with @addr, or the next vma. + * May return %NULL in the case of no vma at addr or above. */ struct vm_area_struct * find_vma_prev(struct mm_struct *mm, unsigned long addr, - struct vm_area_struct **pprev) + struct vm_area_struct **pprev) { struct vm_area_struct *vma; + MA_STATE(mas, &mm->mm_mt, addr, addr); - vma = find_vma(mm, addr); - if (vma) { - *pprev = vma->vm_prev; - } else { - struct rb_node *rb_node = rb_last(&mm->mm_rb); + rcu_read_lock(); + vma = mas_find(&mas, ULONG_MAX); + if (!vma) + mas_reset(&mas); - *pprev = rb_node ? rb_entry(rb_node, struct vm_area_struct, vm_rb) : NULL; - } + *pprev = mas_prev(&mas, 0); + rcu_read_unlock(); return vma; } -- 2.50.1