diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 049bbeb..46dfbca 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -958,7 +958,7 @@ static struct discard_cmd *__insert_discard_tree(struct f2fs_sb_info *sbi,
 				struct rb_node *insert_parent)
 {
 	struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
-	struct rb_node **p = &dcc->root.rb_node;
+	struct rb_node **p;
 	struct rb_node *parent = NULL;
 	struct discard_cmd *dc = NULL;
 
@@ -2095,7 +2095,6 @@ static void get_new_segment(struct f2fs_sb_info *sbi,
 	}
 	secno = left_start;
 skip_left:
-	hint = secno;
 	segno = GET_SEG_FROM_SEC(sbi, secno);
 	zoneno = GET_ZONE_FROM_SEC(sbi, secno);
 
@@ -2388,9 +2387,6 @@ int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range)
 	end_segno = (end >= MAX_BLKADDR(sbi)) ? MAIN_SEGS(sbi) - 1 :
 						GET_SEGNO(sbi, end);
 
-	start_block = START_BLOCK(sbi, start_segno);
-	end_block = START_BLOCK(sbi, end_segno + 1);
-
 	cpc.reason = CP_DISCARD;
 	cpc.trim_minlen = max_t(__u64, 1, F2FS_BYTES_TO_BLK(range->minlen));