mm/nommu: Use maple tree iterators instead of vma linked list

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>

diff --git a/mm/nommu.c b/mm/nommu.c
index 870fea12823e633d047d29b98ca329a5968f23e0..fccdd85ccf482b994c7c809355bef233140f6b24 100644 (file)
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -677,6 +677,7 @@ static void delete_vma(struct mm_struct *mm, struct vm_area_struct *vma)
 struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr)
 {
        struct vm_area_struct *vma;
+       MA_STATE(mas, &mm->mm_mt, 0, 0);
 
        /* check the cache first */
        vma = vmacache_find(mm, addr);
@@ -685,7 +686,7 @@ struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr)
 
        /* trawl the list (there may be multiple mappings in which addr
         * resides) */
-       for (vma = mm->mmap; vma; vma = vma->vm_next) {
+       mas_for_each(&mas, vma, ULONG_MAX) {
                if (vma->vm_start > addr)
                        return NULL;
                if (vma->vm_end > addr) {
@@ -726,6 +727,7 @@ static struct vm_area_struct *find_vma_exact(struct mm_struct *mm,
 {
        struct vm_area_struct *vma;
        unsigned long end = addr + len;
+       MA_STATE(mas, &mm->mm_mt, 0, 0);
 
        /* check the cache first */
        vma = vmacache_find_exact(mm, addr, end);
@@ -734,7 +736,7 @@ static struct vm_area_struct *find_vma_exact(struct mm_struct *mm,
 
        /* trawl the list (there may be multiple mappings in which addr
         * resides) */
-       for (vma = mm->mmap; vma; vma = vma->vm_next) {
+       mas_for_each(&mas, vma, ULONG_MAX) {
                if (vma->vm_start < addr)
                        continue;
                if (vma->vm_start > addr)
@@ -1485,7 +1487,7 @@ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len, struct list
                                return -EINVAL;
                        if (end == vma->vm_end)
                                goto erase_whole_vma;
-                       vma = vma->vm_next;
+                       vma = vma_next(vma);
                } while (vma);
                return -EINVAL;
        } else {
@@ -1543,7 +1545,7 @@ void exit_mmap(struct mm_struct *mm)
        mm->total_vm = 0;
 
        while ((vma = mm->mmap)) {
-               mm->mmap = vma->vm_next;
+               mm->mmap = vma_next(vma);
                delete_vma_from_mm(vma);
                delete_vma(mm, vma);
                cond_resched();