Need help building for aarch64 kernel 5.2

[Dick Hollenbeck <dick@softplc.com>]

Hi Experts,

I really need some help please.

Here is the result of my first build attempt on a tree made from pristine
Linux 5.2.21

and the corresponding RT patch, which applied cleanly:



$ /i/runtime/arm64/kernel/build-arm64-rt.sh
make[1]: Entering directory '/ssd/build/linux-5.2.y'
  GEN     Makefile
scripts/kconfig/conf  --syncconfig Kconfig
  GEN     Makefile
  Using /ssd/linux-5.2.y as source for kernel
  CALL    /ssd/linux-5.2.y/scripts/atomic/check-atomics.sh
  CALL    /ssd/linux-5.2.y/scripts/checksyscalls.sh
  CHK     include/generated/compile.h
  GZIP    kernel/config_data.gz
  CC      kernel/configs.o
  AR      kernel/built-in.a
  GEN     .version
  CHK     include/generated/compile.h
  UPD     include/generated/compile.h
  CC      init/version.o
  AR      init/built-in.a
  LD      vmlinux.o
  MODPOST vmlinux.o
  MODINFO modules.builtin.modinfo
kernel/sched/core.o: In function `migrate_enable':
core.c:(.text+0x3750): undefined reference to `takedown_cpu_task'
core.c:(.text+0x3750): relocation truncated to fit: R_AARCH64_ADR_PREL_PG_HI21 against
undefined symbol `takedown_cpu_task'
core.c:(.text+0x3754): undefined reference to `takedown_cpu_task'
/ssd/linux-5.2.y/Makefile:1054: recipe for target 'vmlinux' failed
make[1]: *** [vmlinux] Error 1
make[1]: Leaving directory '/ssd/build/linux-5.2.y'
Makefile:179: recipe for target 'sub-make' failed
make: *** [sub-make] Error 2


Am I right to think that this pointer, takedown_cpu_task, is more that some maximum
distance away from object file "core.o" in the link image for the build setup?


How are other globals avoiding this same problem, what't the best fix?


Thanks much,

Dick