1 files changed, 11 insertions, 11 deletions

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 20c45757f2b2..e3f855475278 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -609,7 +609,7 @@ scan_swap_map_ssd_cluster_conflict(struct swap_info_struct *si,
 		return false;
 
 	percpu_cluster = this_cpu_ptr(si->percpu_cluster);
-	cluster_set_null(&percpu_cluster->index);
+	percpu_cluster->next = SWAP_NEXT_INVALID;
 	return true;
 }
 
@@ -622,14 +622,14 @@ static bool scan_swap_map_try_ssd_cluster(struct swap_info_struct *si,
 {
 	struct percpu_cluster *cluster;
 	struct swap_cluster_info *ci;
-	unsigned long tmp, max;
+	unsigned int tmp, max;
 
 new_cluster:
 	cluster = this_cpu_ptr(si->percpu_cluster);
-	if (cluster_is_null(&cluster->index)) {
+	tmp = cluster->next;
+	if (tmp == SWAP_NEXT_INVALID) {
 		if (!cluster_list_empty(&si->free_clusters)) {
-			cluster->index = si->free_clusters.head;
-			cluster->next = cluster_next(&cluster->index) *
+			tmp = cluster_next(&si->free_clusters.head) *
 					SWAPFILE_CLUSTER;
 		} else if (!cluster_list_empty(&si->discard_clusters)) {
 			/*
@@ -649,9 +649,7 @@ new_cluster:
 	 * Other CPUs can use our cluster if they can't find a free cluster,
 	 * check if there is still free entry in the cluster
 	 */
-	tmp = cluster->next;
-	max = min_t(unsigned long, si->max,
-		    (cluster_next(&cluster->index) + 1) * SWAPFILE_CLUSTER);
+	max = min_t(unsigned long, si->max, ALIGN(tmp + 1, SWAPFILE_CLUSTER));
 	if (tmp < max) {
 		ci = lock_cluster(si, tmp);
 		while (tmp < max) {
@@ -662,12 +660,13 @@ new_cluster:
 		unlock_cluster(ci);
 	}
 	if (tmp >= max) {
-		cluster_set_null(&cluster->index);
+		cluster->next = SWAP_NEXT_INVALID;
 		goto new_cluster;
 	}
-	cluster->next = tmp + 1;
 	*offset = tmp;
 	*scan_base = tmp;
+	tmp += 1;
+	cluster->next = tmp < max ? tmp : SWAP_NEXT_INVALID;
 	return true;
 }
 
@@ -3163,8 +3162,9 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
 		}
 		for_each_possible_cpu(cpu) {
 			struct percpu_cluster *cluster;
+
 			cluster = per_cpu_ptr(p->percpu_cluster, cpu);
-			cluster_set_null(&cluster->index);
+			cluster->next = SWAP_NEXT_INVALID;
 		}
 	} else {
 		atomic_inc(&nr_rotate_swap);