Compilation error on RPI 4 (incompatible-pointer-types)

[d1ckb31n]

Any idea on how to fix this compilation error on a RPI4?

pi@raspberrypi:\~/soft_uart $ make make -C /usr/src/linux-headers-6.6.20+rpt-rpi-v8 M=/home/pi/soft_uart modules make[1]: Entering directory '/usr/src/linux-headers-6.6.20+rpt-rpi-v8' CC [M] /home/pi/soft_uart/module.o /home/pi/soft_uart/module.c:47:22: error: initialization of ‘ssize_t ()(struct tty_struct , const u8 , size_t)’ {aka ‘long int ()(struct tty_struct , const unsigned char , long unsigned int)’} from incompatible pointer type ‘int ()(struct tty_struct , const unsigned char , int)’ [-Werror=incompatible-pointer-types] 47 | .write = soft_uart_write, | ^~~~~~~ /home/pi/soft_uart/module.c:47:22: note: (near initialization for ‘soft_uart_operations.write’) /home/pi/soft_uart/module.c:52:22: error: initialization of ‘void ()(struct tty_struct , const struct ktermios )’ from incompatible pointer type ‘void ()(struct tty_struct , struct ktermios *)’ [-Werror=incompatible-pointer-types] 52 | .set_termios = soft_uart_set_termios, | ^~~~~ /home/pi/soft_uart/module.c:52:22: note: (near initialization for ‘soft_uart_operations.set_termios’) cc1: some warnings being treated as errors make[3]: [/usr/src/linux-headers-6.6.20+rpt-common-rpi/scripts/Makefile.build:248: /home/pi/soft_uart/module.o] Error 1 make[2]: [/usr/src/linux-headers-6.6.20+rpt-common-rpi/Makefile:1938: /home/pi/soft_uart] Error 2 make[1]: [/usr/src/linux-headers-6.6.20+rpt-common-rpi/Makefile:246: __sub-make] Error 2 make[1]: Leaving directory '/usr/src/linux-headers-6.6.20+rpt-rpi-v8' make: [Makefile:9: all] Error 2 pi@raspberrypi:~/soft_uart $

[bibiboss]

Same here on RPI5