From abdba2dda0c477ca708a939b02f9b2e74666ed2d Mon Sep 17 00:00:00 2001 From: "Liam R. Howlett" Date: Tue, 6 Sep 2022 19:48:50 +0000 Subject: mm: use maple tree operations for find_vma_intersection() Move find_vma_intersection() to mmap.c and change implementation to maple tree. When searching for a vma within a range, it is easier to use the maple tree interface. Exported find_vma_intersection() for kvm module. Link: https://lkml.kernel.org/r/20220906194824.2110408-24-Liam.Howlett@oracle.com Signed-off-by: Liam R. Howlett Tested-by: Yu Zhao Cc: Catalin Marinas Cc: David Hildenbrand Cc: David Howells Cc: Davidlohr Bueso Cc: "Matthew Wilcox (Oracle)" Cc: SeongJae Park Cc: Sven Schnelle Cc: Vlastimil Babka Cc: Will Deacon Signed-off-by: Andrew Morton --- mm/nommu.c | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'mm/nommu.c') diff --git a/mm/nommu.c b/mm/nommu.c index 321c7e6718a8..2702790d05d3 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -642,6 +642,17 @@ static void delete_vma(struct mm_struct *mm, struct vm_area_struct *vma) vm_area_free(vma); } +struct vm_area_struct *find_vma_intersection(struct mm_struct *mm, + unsigned long start_addr, + unsigned long end_addr) +{ + unsigned long index = start_addr; + + mmap_assert_locked(mm); + return mt_find(&mm->mm_mt, &index, end_addr - 1); +} +EXPORT_SYMBOL(find_vma_intersection); + /* * look up the first VMA in which addr resides, NULL if none * - should be called with mm->mmap_lock at least held readlocked -- cgit v1.2.3-59-g8ed1b