OP8 13.1: can't open file "kernel/sched_assist/Kconfig"

[chkkvjjc]

Branch: sm8250_t_13.1_op8
I want to build a kernel for Oneplus 8t, but i have discovered the following errors：

$ ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make bengal-pref_config
  HOSTCC  scripts/basic/fixdep
  HOSTCC  scripts/kconfig/conf.o
  YACC    scripts/kconfig/zconf.tab.c
  LEX     scripts/kconfig/zconf.lex.c
  HOSTCC  scripts/kconfig/zconf.tab.o
  HOSTLD  scripts/kconfig/conf
init/Kconfig:772: can't open file "kernel/sched_assist/Kconfig"
make[1]: *** [scripts/kconfig/Makefile:104: bengal-perf_defconfig] Error 1
make: *** [Makefile:636: bengal-perf_defconfig] Error 2

I found that "sched_assist" is a softlink where is out of this repo (Maybe it's in android source code?).
Maybe I have mistakes? What should i do?

Chinese (My English is poor):
我想给我的一加8t编译一个内核（分支为sm8250_t_13.1_op8），但是我在make ***_defconfig时候报错了（如上日志）。
报错的sched_assist目录是个软链接，指向的是内核源码外（看样子似乎是安卓源码）。。。
也许还有其他的步骤没走？

[YumeMichi]

https://github.com/OnePlusOSS/android_kernel_modules_and_devicetree_oneplus_sm8250