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diff -pNaru5 a/serial_core.c b/serial_core.c
--- a/serial_core.c 2023-12-18 13:31:42.354486402 -0500
+++ b/serial_core.c 2023-12-18 13:31:55.024139616 -0500
@@ -567,12 +567,17 @@ static int uart_put_char(struct tty_stru
static void uart_flush_chars(struct tty_struct *tty)
{
uart_start(tty);
}
+#if LINUX_VERSION_CODE < KERNEL_VERSION(6,6,0)
static int uart_write(struct tty_struct *tty,
const unsigned char *buf, int count)
+#else
+static ssize_t uart_write(struct tty_struct *tty,
+ const unsigned char *buf, size_t count)
+#endif
{
struct uart_state *state = tty->driver_data;
struct uart_port *port;
struct circ_buf *circ;
unsigned long flags;
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