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-rw-r--r--kernel/debug/kdb/kdb_main.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index 515379cbf209..6865a0f58d38 100644
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -1108,7 +1108,8 @@ static int handle_ctrl_cmd(char *cmd)
switch (*cmd) {
case CTRL_P:
if (cmdptr != cmd_tail)
- cmdptr = (cmdptr-1) % KDB_CMD_HISTORY_COUNT;
+ cmdptr = (cmdptr + KDB_CMD_HISTORY_COUNT - 1) %
+ KDB_CMD_HISTORY_COUNT;
strscpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
return 1;
case CTRL_N: