解决编译报错：undefined reference to `__arm64_sys_process_mrelease'

parasite

【问题描述】：内核编译报错如下

1. [OHOS ERROR] The symbol rockchip_clk_register_armclk is exported and annotated __init
2. [OHOS ERROR] Fix this by removing the __init annotation of rockchip_clk_register_armclk or drop the export.
3. [OHOS ERROR]
4. [OHOS ERROR]   MODINFO modules.builtin.modinfo
5. [OHOS ERROR]   GEN     modules.builtin
6. [OHOS ERROR]   LD      .tmp_vmlinux.kallsyms1
7. [OHOS ERROR] ../../../../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'
8. [OHOS ERROR] make[2]: *** [/home/wen_fei/OpenHarmony/dayu210-v4.1-release/out/kernel/src_tmp/linux-5.10/Makefile:1224: vmlinux] Error 1
9. [OHOS ERROR] make[1]: *** [arch/arm64/Makefile:207: rk3588-evb7-lp4-v10-linux.img] Error 2
10. [OHOS ERROR] make[1]: Leaving directory '/home/wen_fei/OpenHarmony/dayu210-v4.1-release/out/kernel/OBJ/linux-5.10'
11. [OHOS ERROR] make: *** [Makefile:192: __sub-make] Error 2

复制代码

【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

1. #define __NR_process_mrelease 448
2. __SYSCALL(__NR_process_mrelease, sys_process_mrelease)

复制代码

【处理方式】：进入arch/arm64/include/asm/unistd32.h文件删除下面语句即可

1. #define __NR_process_mrelease 448
2. __SYSCALL(__NR_process_mrelease, sys_process_mrelease)

复制代码