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authorLiam R. Howlett <Liam.Howlett@Oracle.com>2022-09-06 22:48:46 +0300
committerAndrew Morton <akpm@linux-foundation.org>2022-09-27 05:46:15 +0300
commitbe8432e7166ef8cc5647d6d350e73897d48a9659 (patch)
tree4aefd7991f70bc50849157da0b3d7d127af954bb /mm/mmap.c
parent2e3af1db174423e0fb75c7887251f168d8401424 (diff)
downloadlinux-be8432e7166ef8cc5647d6d350e73897d48a9659.tar.xz
mm/mmap: use the maple tree in find_vma() instead of the rbtree.
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@oracle.com Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: David Hildenbrand <david@redhat.com> Tested-by: Yu Zhao <yuzhao@google.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: David Howells <dhowells@redhat.com> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org> Cc: SeongJae Park <sj@kernel.org> Cc: Sven Schnelle <svens@linux.ibm.com> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/mmap.c')
-rw-r--r--mm/mmap.c28
1 files changed, 10 insertions, 18 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index f1b07751a1e4..dbbf8ee12f60 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2449,11 +2449,18 @@ get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
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 mm_struct *mm, unsigned long addr)
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;