[PATCH v2 43/61] kernel/sched/fair: Use maple tree iterators instead of linked list

[Liam Howlett <liam.howlett@xxxxxxxxxx>]

From: "Liam R. Howlett" <Liam.Howlett@xxxxxxxxxx>

Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
---
 kernel/sched/fair.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 44e44c235f1f..154fce44b38a 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2688,6 +2688,7 @@ static void task_numa_work(struct callback_head *work)
 	unsigned long start, end;
 	unsigned long nr_pte_updates = 0;
 	long pages, virtpages;
+	MA_STATE(mas, &mm->mm_mt, 0, 0);
 
 	SCHED_WARN_ON(p != container_of(work, struct task_struct, numa_work));
 
@@ -2740,13 +2741,17 @@ static void task_numa_work(struct callback_head *work)
 
 	if (!mmap_read_trylock(mm))
 		return;
-	vma = find_vma(mm, start);
+
+	rcu_read_lock();
+	mas_set(&mas, start);
+	vma = mas_find(&mas, ULONG_MAX);
 	if (!vma) {
 		reset_ptenuma_scan(p);
 		start = 0;
-		vma = mm->mmap;
+		mas_set(&mas, start);
 	}
-	for (; vma; vma = vma->vm_next) {
+
+	mas_for_each(&mas, vma, ULONG_MAX) {
 		if (!vma_migratable(vma) || !vma_policy_mof(vma) ||
 			is_vm_hugetlb_page(vma) || (vma->vm_flags & VM_MIXEDMAP)) {
 			continue;
@@ -2791,7 +2796,9 @@ static void task_numa_work(struct callback_head *work)
 			if (pages <= 0 || virtpages <= 0)
 				goto out;
 
+			rcu_read_unlock();
 			cond_resched();
+			rcu_read_lock();
 		} while (end != vma->vm_end);
 	}
 
@@ -2806,6 +2813,7 @@ static void task_numa_work(struct callback_head *work)
 		mm->numa_scan_offset = start;
 	else
 		reset_ptenuma_scan(p);
+	rcu_read_unlock();
 	mmap_read_unlock(mm);
 
 	/*
-- 
2.30.2