won't compile about tty0tty HOT 5 CLOSED

/tmp/tty0tty$ make
make -C module clean
make[1]: Entering directory '/tmp/tty0tty/module'
rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions modules.order Module.symvers
make[1]: Leaving directory '/tmp/tty0tty/module'
make -C pts clean
make[1]: Entering directory '/tmp/tty0tty/pts'
rm -rf tty0tty *.o core
make[1]: Leaving directory '/tmp/tty0tty/pts'
make -C module default
make[1]: Entering directory '/tmp/tty0tty/module'
make -C /lib/modules/4.15.0-22-generic/build M=/tmp/tty0tty/module modules
make[2]: Entering directory '/usr/src/linux-headers-4.15.0-22-generic'
  CC [M]  /tmp/tty0tty/module/tty0tty.o
  Building modules, stage 2.
  MODPOST 1 modules
  CC      /tmp/tty0tty/module/tty0tty.mod.o
  LD [M]  /tmp/tty0tty/module/tty0tty.ko
make[2]: Leaving directory '/usr/src/linux-headers-4.15.0-22-generic'
make[1]: Leaving directory '/tmp/tty0tty/module'
make -C pts all
make[1]: Entering directory '/tmp/tty0tty/pts'
gcc -Wall -O2 -D_GNU_SOURCE -Wno-unused-but-set-variable tty0tty.c -o tty0tty
make[1]: Leaving directory '/tmp/tty0tty/pts'
/tmp/tty0tty$

Linux zoltan-ThinkPad-T470s 4.15.0-29-generic #31-Ubuntu SMP Tue Jul 17 15:39:52 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

make -C /lib/modules/4.15.0-29-generic/build M=/home/zoltan/code/tty0tty-1.2/module modules
make[1]: Entering directory '/usr/src/linux-headers-4.15.0-29-generic'
  CC [M]  /home/zoltan/code/tty0tty-1.2/module/tty0tty.o
/home/zoltan/code/tty0tty-1.2/module/tty0tty.c: In function ‘tty0tty_ioctl_tiocmiwait’:
/home/zoltan/code/tty0tty-1.2/module/tty0tty.c:524:8: error: implicit declaration of function ‘signal_pending’; did you mean ‘timer_pending’? [-Werror=implicit-function-declaration]
    if (signal_pending(current))
        ^~~~~~~~~~~~~~
        timer_pending
cc1: some warnings being treated as errors
scripts/Makefile.build:339: recipe for target '/home/zoltan/code/tty0tty-1.2/module/tty0tty.o' failed
make[2]: *** [/home/zoltan/code/tty0tty-1.2/module/tty0tty.o] Error 1
Makefile:1552: recipe for target '_module_/home/zoltan/code/tty0tty-1.2/module' failed
make[1]: *** [_module_/home/zoltan/code/tty0tty-1.2/module] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-4.15.0-29-generic'
Makefile:26: recipe for target 'default' failed
make: *** [default] Error 2