解决编译报错：undefined reference to `__arm64_sys_process_mrelease'
【问题描述】：内核编译报错如下The symbol rockchip_clk_register_armclk is exported and annotated __init
Fix this by removing the __init annotation of rockchip_clk_register_armclk or drop the export.
MODINFO modules.builtin.modinfo
GEN modules.builtin
LD .tmp_vmlinux.kallsyms1
../../../../prebuilts/gcc/linux-x86/aarch64/gcc-arm-10.3-2021.07-x86_64-aarch64-none-linux-gnu/bin/aarch64-none-linux-gnu-ld: arch/arm64/kernel/sys32.o:(.rodata+0xe00): undefined reference to `__arm64_sys_process_mrelease'
make: *** Error 1
make: *** Error 2
make: Leaving directory '/home/wen_fei/OpenHarmony/dayu210-v4.1-release/out/kernel/OBJ/linux-5.10'
make: *** Error 2https://192.168.3.50:8088/gitlab.com/-/project/1415/uploads/19bb490c06ccd5b4e4a51929d43ce08e/image.png【问题分析】：出现该问题原因是内核没有实现系统调用__NR_process_mrelease，但是在arch/arm64/include/asm/unistd32.h中却定义了下面的语句导致符号表找不到
#define __NR_process_mrelease 448
__SYSCALL(__NR_process_mrelease, sys_process_mrelease)【处理方式】：进入arch/arm64/include/asm/unistd32.h文件删除下面语句即可
#define __NR_process_mrelease 448
__SYSCALL(__NR_process_mrelease, sys_process_mrelease)
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