diff --git a/drivers/tty/serial/wch_35x/wch_serial.c b/drivers/tty/serial/wch_35x/wch_serial.c
index 0ae0b53f..b01b0de7 100644
--- a/drivers/tty/serial/wch_35x/wch_serial.c
+++ b/drivers/tty/serial/wch_35x/wch_serial.c
@@ -60,7 +60,11 @@ static int ser_put_char(struct tty_struct *, unsigned char);
 static void ser_flush_chars(struct tty_struct *);
 static unsigned int ser_chars_in_buffer(struct tty_struct *tty);
 static void ser_flush_buffer(struct tty_struct *);
+#if defined(NV_TTY_OPERATIONS_STRUCT_SEND_XCHAR_HAS_U8_ARG) /* Linux 6.8 */
+static void ser_send_xchar(struct tty_struct *, u8);
+#else
 static void ser_send_xchar(struct tty_struct *, char);
+#endif
 static void ser_throttle(struct tty_struct *);
 static void ser_unthrottle(struct tty_struct *);
 static int ser_get_info(struct ser_state *, struct serial_struct *);
@@ -692,7 +696,11 @@ static void ser_flush_buffer(struct tty_struct *tty)
     }
 }
 
+#if defined(NV_TTY_OPERATIONS_STRUCT_SEND_XCHAR_HAS_U8_ARG) /* Linux 6.8 */
+static void ser_send_xchar(struct tty_struct *tty, u8 ch)
+#else
 static void ser_send_xchar(struct tty_struct *tty, char ch)
+#endif
 {
     struct ser_state *state = NULL;
     struct ser_port *port = NULL;
diff --git a/scripts/conftest/Makefile b/scripts/conftest/Makefile
index e215e1ea..00ebb3ec 100644
--- a/scripts/conftest/Makefile
+++ b/scripts/conftest/Makefile
@@ -151,6 +151,7 @@ NV_CONFTEST_FUNCTION_COMPILE_TESTS += tc_taprio_qopt_offload_struct_has_cmd
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += tegra264_chip_id
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += tegra_dev_iommu_get_stream_id
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += tegra_ivc_struct_has_iosys_map
+NV_CONFTEST_FUNCTION_COMPILE_TESTS += tty_operations_struct_send_xchar_has_u8_arg
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += tty_operations_struct_write_has_u8_ptr_arg
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += tty_operations_struct_set_termios_has_const_ktermios_arg
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += ufs_hba_variant_ops_suspend_has_status_arg
diff --git a/scripts/conftest/conftest.sh b/scripts/conftest/conftest.sh
index 90437ade..fbead866 100755
--- a/scripts/conftest/conftest.sh
+++ b/scripts/conftest/conftest.sh
@@ -7491,6 +7491,25 @@ compile_test() {
             compile_check_conftest "$CODE" "NV_TEGRA_DEV_IOMMU_GET_STREAM_ID_PRESENT" "" "functions"
         ;;
 
+        tty_operations_struct_send_xchar_has_u8_arg)
+            #
+            # Determine if the struct tty_operations::send_xchar argument is of type u8.
+            #
+            # Commit 3a00da027946 ("tty: make tty_operations::send_xchar accept u8 char")
+            # updated the argument for tty_operations::send_xchar from char to u8 in Linux
+            # v6.8.
+            #
+            CODE="
+            #include <linux/tty.h>
+            #include <linux/tty_driver.h>
+            static inline void conftest_send_xchar(struct tty_struct *ttys, u8 ch) {}
+            static struct tty_operations tty_ops = {
+                  .send_xchar = conftest_send_xchar,
+            };"
+
+            compile_check_conftest "$CODE" "NV_TTY_OPERATIONS_STRUCT_SEND_XCHAR_HAS_U8_ARG" "" "types"
+        ;;
+
         tty_operations_struct_write_has_u8_ptr_arg)
             #
             # Determine if the function write() of tty_operations has u8 type pointer argument.