The quilt patch titled
Subject: mm/mmap: use the maple tree in find_vma() instead of the rbtree.
has been removed from the -mm tree. Its filename was
mm-mmap-use-the-maple-tree-in-find_vma-instead-of-the-rbtree.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: "Liam R. Howlett" <Liam.Howlett@xxxxxxxxxx>
Subject: mm/mmap: use the maple tree in find_vma() instead of the rbtree.
Date: Tue, 6 Sep 2022 19:48:46 +0000
Using the maple tree interface mt_find() will handle the RCU locking and
will start searching at the address up to the limit, ULONG_MAX in this
case.
Add kernel documentation to this API.
Link: https://lkml.kernel.org/r/20220906194824.2110408-12-Liam.Howlett@xxxxxxxxxx
Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Tested-by: Yu Zhao <yuzhao@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Cc: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Cc: SeongJae Park <sj@xxxxxxxxxx>
Cc: Sven Schnelle <svens@xxxxxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mmap.c | 28 ++++++++++------------------
1 file changed, 10 insertions(+), 18 deletions(-)
--- a/mm/mmap.c~mm-mmap-use-the-maple-tree-in-find_vma-instead-of-the-rbtree
+++ a/mm/mmap.c
@@ -2449,11 +2449,18 @@ get_unmapped_area(struct file *file, uns
EXPORT_SYMBOL(get_unmapped_area);
-/* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
+/**
+ * find_vma() - Find the VMA for a given address, or the next VMA.
+ * @mm: The mm_struct to check
+ * @addr: The address
+ *
+ * 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(struct mm_struct *mm, unsigned long addr)
{
- struct rb_node *rb_node;
struct vm_area_struct *vma;
+ unsigned long index = addr;
mmap_assert_locked(mm);
/* Check the cache first. */
@@ -2461,22 +2468,7 @@ struct vm_area_struct *find_vma(struct m
if (likely(vma))
return vma;
- rb_node = mm->mm_rb.rb_node;
-
- while (rb_node) {
- struct vm_area_struct *tmp;
-
- tmp = rb_entry(rb_node, struct vm_area_struct, vm_rb);
-
- if (tmp->vm_end > addr) {
- vma = tmp;
- if (tmp->vm_start <= addr)
- break;
- rb_node = rb_node->rb_left;
- } else
- rb_node = rb_node->rb_right;
- }
-
+ vma = mt_find(&mm->mm_mt, &index, ULONG_MAX);
if (vma)
vmacache_update(addr, vma);
return vma;
_
Patches currently in -mm which might be from Liam.Howlett@xxxxxxxxxx are
