mm/ksm: Use vma iterators instead of vma linked list

Remove the use of the linked list for eventual removal.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>

diff --git a/mm/ksm.c b/mm/ksm.c
index c20bd4d9a0d9ed00aa896deebadefc1ca4115dd4..487e625324590c5c8b52da8cc66cf874302eaec3 100644 (file)
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -974,11 +974,13 @@ static int unmerge_and_remove_all_rmap_items(void)
                                                struct mm_slot, mm_list);
        spin_unlock(&ksm_mmlist_lock);
 
-       for (mm_slot = ksm_scan.mm_slot;
-                       mm_slot != &ksm_mm_head; mm_slot = ksm_scan.mm_slot) {
+       for (mm_slot = ksm_scan.mm_slot; mm_slot != &ksm_mm_head;
+            mm_slot = ksm_scan.mm_slot) {
+               VMA_ITERATOR(vmi, mm_slot->mm, 0);
+
                mm = mm_slot->mm;
                mmap_read_lock(mm);
-               for (vma = mm->mmap; vma; vma = vma->vm_next) {
+               for_each_vma(vmi, vma) {
                        if (ksm_test_exit(mm))
                                break;
                        if (!(vma->vm_flags & VM_MERGEABLE) || !vma->anon_vma)
@@ -2226,6 +2228,7 @@ static struct rmap_item *scan_get_next_rmap_item(struct page **page)
        struct mm_slot *slot;
        struct vm_area_struct *vma;
        struct rmap_item *rmap_item;
+       struct vma_iterator vmi;
        int nid;
 
        if (list_empty(&ksm_mm_head.mm_list))
@@ -2284,13 +2287,13 @@ next_mm:
        }
 
        mm = slot->mm;
+       vma_iter_init(&vmi, mm, ksm_scan.address);
+
        mmap_read_lock(mm);
        if (ksm_test_exit(mm))
-               vma = NULL;
-       else
-               vma = find_vma(mm, ksm_scan.address);
+               goto no_vmas;
 
-       for (; vma; vma = vma->vm_next) {
+       for_each_vma(vmi, vma) {
                if (!(vma->vm_flags & VM_MERGEABLE))
                        continue;
                if (ksm_scan.address < vma->vm_start)
@@ -2328,6 +2331,7 @@ next_mm:
        }
 
        if (ksm_test_exit(mm)) {
+no_vmas:
                ksm_scan.address = 0;
                ksm_scan.rmap_list = &slot->rmap_list;
        }