undefined reference to `ksceKernelCpuDcacheAndL2WritebackRange'

[MirrichWangD]

These are the errors I get during compilation:

[  4%] Building C object CMakeFiles/modoru_kernel.dir/kernel.c.obj
/root/modoru/kernel.c: In function 'ksceKernelStartPreloadedModulesPatched':
/root/modoru/kernel.c:87:3: warning: implicit declaration of function 'ksceKernelSysrootGetProcessTitleId'; did you mean 'ksceKernelGetProcessId'? [-Wimplicit-function-declaration]
   87 |   ksceKernelSysrootGetProcessTitleId(pid, titleid, sizeof(titleid));
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |   ksceKernelGetProcessId
/root/modoru/kernel.c: In function 'nzero32':
/root/modoru/kernel.c:148:51: warning: assignment to 'void *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
  148 |   cargs.list.lv1[0].addr = cargs.list.lv1[1].addr = 0x50000000;
      |                                                   ^
/root/modoru/kernel.c: In function 'ksceSblSmCommCallFuncPatched':
/root/modoru/kernel.c:178:11: warning: implicit declaration of function 'ksceKernelCpuDcacheAndL2WritebackRange' [-Wimplicit-function-declaration]
  178 |           ksceKernelCpuDcacheAndL2WritebackRange(spkg_header, sizeof(SpkgHeader));
      |           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/root/modoru/kernel.c: In function 'k_modoru_get_factory_firmware':
/root/modoru/kernel.c:375:19: warning: implicit declaration of function 'ksceKernelSysrootGetKblParam' [-Wimplicit-function-declaration]
  375 |   void* sysroot = ksceKernelSysrootGetKblParam();
      |                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/root/modoru/kernel.c:375:19: warning: initialization of 'void *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
In file included from /usr/local/vitasdk/arm-vita-eabi/include/psp2kern/kernel/sysmem.h:19,
                 from /root/modoru/kernel.c:12:
/root/modoru/kernel.c: In function 'k_modoru_ctrl_peek_buffer_positive':
/root/modoru/kernel.c:402:32: warning: passing argument 1 of 'ksceKernelCopyToUser' makes pointer from integer without a cast [-Wint-conversion]
  402 |   ksceKernelMemcpyKernelToUser((uintptr_t)pad_data, &pad, sizeof(SceCtrlData));
      |                                ^
      |                                |
      |                                unsigned int
/usr/local/vitasdk/arm-vita-eabi/include/psp2kern/kernel/sysmem/data_transfers.h:69:32: note: expected 'void *' but argument is of type 'unsigned int'
   69 | int ksceKernelCopyToUser(void *dst, const void *src, SceSize len);
      |                          ~~~~~~^~~
[  8%] Linking C executable modoru_kernel
/usr/local/vitasdk/bin/../lib/gcc/arm-vita-eabi/10.3.0/../../../../arm-vita-eabi/bin/ld: CMakeFiles/modoru_kernel.dir/kernel.c.obj: in function `ksceSblSmCommCallFuncPatched':
kernel.c:(.text+0x274): undefined reference to `ksceKernelCpuDcacheAndL2WritebackRange'
/usr/local/vitasdk/bin/../lib/gcc/arm-vita-eabi/10.3.0/../../../../arm-vita-eabi/bin/ld: CMakeFiles/modoru_kernel.dir/spkg.c.obj: in function `decrypt_spkg':
spkg.c:(.text+0x3e6): undefined reference to `ksceKernelCpuDcacheAndL2WritebackRange'
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/modoru_kernel.dir/build.make:113: modoru_kernel] Error 1
make[1]: *** [CMakeFiles/Makefile2:277: CMakeFiles/modoru_kernel.dir/all] Error 2
make: *** [Makefile:91: all] Error 2

I think this is because the function ksceKernelCpuDcacheAndL2WritebackRange is not defined in psp2kern? Or is it because my version of vitasdk is too new that this function is not available? How can I solve this problem?

どうもありがとう