[PATCH v12 51/69] mm/gup: use maple tree navigation instead of linked list

Liam Howlett
2022-07-20T02:23:54Z

Use find_vma_intersection() to locate the VMAs in __mm_populate() instead
of using find_vma() and the linked list.

Link: https://lkml.kernel.org/r/20220504011345.662299-36-Liam.Howlett@oracle.com
Link: https://lkml.kernel.org/r/20220621204632.3370049-52-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Howells <dhowells@redhat.com>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: SeongJae Park <sj@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Will Deacon <will@kernel.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/gup.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/mm/gup.c b/mm/gup.c
index 407a81d5ca03..f0e5d68ea932 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1641,10 +1641,11 @@ int __mm_populate(unsigned long start, unsigned long len, int ignore_errors)
if (!locked) {
locked = 1;
mmap_read_lock(mm);
- vma = find_vma(mm, nstart);
+ vma = find_vma_intersection(mm, nstart, end);
} else if (nstart >= vma->vm_end)
- vma = vma->vm_next;
- if (!vma || vma->vm_start >= end)
+ vma = find_vma_intersection(mm, vma->vm_end, end);
+
+ if (!vma)
break;
/*
* Set [nstart; nend) to intersection of desired address
--
2.35.1