From: "Liam R. Howlett" <Liam.Howlett@xxxxxxxxxx> Since there is no longer a linked list, the range_has_overlap() function is identical to the find_vma_intersection() function. Link: https://lkml.kernel.org/r/20220504011345.662299-53-Liam.Howlett@xxxxxxxxxx Link: https://lkml.kernel.org/r/20220621204632.3370049-69-Liam.Howlett@xxxxxxxxxx Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx> Acked-by: Vlastimil Babka <vbabka@xxxxxxx> Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: David Howells <dhowells@xxxxxxxxxx> Cc: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx> Cc: SeongJae Park <sj@xxxxxxxxxx> Cc: Will Deacon <will@xxxxxxxxxx> Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/mmap.c | 27 +-------------------------- 1 file changed, 1 insertion(+), 26 deletions(-) diff --git a/mm/mmap.c b/mm/mmap.c index d5ee450578ed..a9ebe25c5b09 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -437,30 +437,6 @@ anon_vma_interval_tree_post_update_vma(struct vm_area_struct *vma) anon_vma_interval_tree_insert(avc, &avc->anon_vma->rb_root); } -/* - * range_has_overlap() - Check the @start - @end range for overlapping VMAs and - * sets up a pointer to the previous VMA - * @mm: the mm struct - * @start: the start address of the range - * @end: the end address of the range - * @pprev: the pointer to the pointer of the previous VMA - * - * Returns: True if there is an overlapping VMA, false otherwise - */ -static inline -bool range_has_overlap(struct mm_struct *mm, unsigned long start, - unsigned long end, struct vm_area_struct **pprev) -{ - struct vm_area_struct *existing; - - MA_STATE(mas, &mm->mm_mt, start, start); - rcu_read_lock(); - existing = mas_find(&mas, end - 1); - *pprev = mas_prev(&mas, 0); - rcu_read_unlock(); - return existing ? true : false; -} - static unsigned long count_vma_pages_range(struct mm_struct *mm, unsigned long addr, unsigned long end) { @@ -3221,11 +3197,10 @@ void exit_mmap(struct mm_struct *mm) */ int insert_vm_struct(struct mm_struct *mm, struct vm_area_struct *vma) { - struct vm_area_struct *prev; unsigned long charged = vma_pages(vma); - if (range_has_overlap(mm, vma->vm_start, vma->vm_end, &prev)) + if (find_vma_intersection(mm, vma->vm_start, vma->vm_end)) return -ENOMEM; if ((vma->vm_flags & VM_ACCOUNT) && -- 2.35.1
