diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 8da7c14a9d29d7fc35f95a77533e243624e87ac8..e60480f71bb5aed5bcadc9fc1329e012216ed0a3 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -28,7 +28,7 @@ static int gc_thread_func(void *data)
 	struct f2fs_sb_info *sbi = data;
 	struct f2fs_gc_kthread *gc_th = sbi->gc_thread;
 	wait_queue_head_t *wq = &sbi->gc_thread->gc_wait_queue_head;
-	long wait_ms;
+	unsigned int wait_ms;
 
 	wait_ms = gc_th->min_sleep_time;
 
diff --git a/fs/f2fs/gc.h b/fs/f2fs/gc.h
index 57a9000ce3af62233d68b15c8db33ddaa168e18e..9325191fab2d6f4d571541c79c55ede3d5e47775 100644
--- a/fs/f2fs/gc.h
+++ b/fs/f2fs/gc.h
@@ -69,25 +69,32 @@ static inline block_t limit_free_user_blocks(struct f2fs_sb_info *sbi)
 }
 
 static inline void increase_sleep_time(struct f2fs_gc_kthread *gc_th,
-								long *wait)
+							unsigned int *wait)
 {
+	unsigned int min_time = gc_th->min_sleep_time;
+	unsigned int max_time = gc_th->max_sleep_time;
+
 	if (*wait == gc_th->no_gc_sleep_time)
 		return;
 
-	*wait += gc_th->min_sleep_time;
-	if (*wait > gc_th->max_sleep_time)
-		*wait = gc_th->max_sleep_time;
+	if ((long long)*wait + (long long)min_time > (long long)max_time)
+		*wait = max_time;
+	else
+		*wait += min_time;
 }
 
 static inline void decrease_sleep_time(struct f2fs_gc_kthread *gc_th,
-								long *wait)
+							unsigned int *wait)
 {
+	unsigned int min_time = gc_th->min_sleep_time;
+
 	if (*wait == gc_th->no_gc_sleep_time)
 		*wait = gc_th->max_sleep_time;
 
-	*wait -= gc_th->min_sleep_time;
-	if (*wait <= gc_th->min_sleep_time)
-		*wait = gc_th->min_sleep_time;
+	if ((long long)*wait - (long long)min_time < (long long)min_time)
+		*wait = min_time;
+	else
+		*wait -= min_time;
 }
 
 static inline bool has_enough_invalid_blocks(struct f2fs_sb_info *sbi)
diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
index 6f77a2755abbfa89b4ab93467d69d36364650693..db5c98256147d775a2d7169f82679cf71d4661af 100644
--- a/include/trace/events/f2fs.h
+++ b/include/trace/events/f2fs.h
@@ -543,14 +543,14 @@ TRACE_EVENT(f2fs_map_blocks,
 
 TRACE_EVENT(f2fs_background_gc,
 
-	TP_PROTO(struct super_block *sb, long wait_ms,
+	TP_PROTO(struct super_block *sb, unsigned int wait_ms,
 			unsigned int prefree, unsigned int free),
 
 	TP_ARGS(sb, wait_ms, prefree, free),
 
 	TP_STRUCT__entry(
 		__field(dev_t,	dev)
-		__field(long,	wait_ms)
+		__field(unsigned int,	wait_ms)
 		__field(unsigned int,	prefree)
 		__field(unsigned int,	free)
 	),
@@ -562,7 +562,7 @@ TRACE_EVENT(f2fs_background_gc,
 		__entry->free		= free;
 	),
 
-	TP_printk("dev = (%d,%d), wait_ms = %ld, prefree = %u, free = %u",
+	TP_printk("dev = (%d,%d), wait_ms = %u, prefree = %u, free = %u",
 		show_dev(__entry->dev),
 		__entry->wait_ms,
 		__entry->prefree,