The kexec-mod from fabianishere

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Kexec as loadable kernel module for Linux ARM64 kernels

License: GNU General Public License v2.0

Makefile 2.70% Assembly 11.08% C 86.21%

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Build error on Raspberry Pi 4

This is a very useful tool because it is not easy to rebuild the kernel without kernel config parameters. All you need to do is to apt install Linux kernel header then build this module.

However, on Raspberry Pi 4, the build process fails with the following error:

root@raspberrypi:~/kexec-mod/kernel# make KDIR=/usr/src/linux-headers-5.10.63-v8+/
make -C /usr/src/linux-headers-5.10.63-v8+/ M=/root/kexec-mod/kernel modules
make[1]: Entering directory '/usr/src/linux-headers-5.10.63-v8+'
  CC [M]  /root/kexec-mod/kernel/arch/arm64/idmap.o
/root/kexec-mod/kernel/arch/arm64/idmap.c: In function ‘kexec_pa_symbol’:
/root/kexec-mod/kernel/arch/arm64/idmap.c:118:19: error: passing argument 1 of ‘pud_offset’ from incompatible pointer type [-Werror=incompatible-pointer-types]
  pud = pud_offset(pgd , va);
                   ^~~
In file included from ./arch/arm64/include/asm/pgtable-types.h:50,
                 from ./arch/arm64/include/asm/page.h:16,
                 from ./arch/arm64/include/asm/proc-fns.h:14,
                 from ./arch/arm64/include/asm/pgtable.h:9,
                 from /root/kexec-mod/kernel/arch/arm64/idmap.c:15:
./include/asm-generic/pgtable-nopud.h:42:40: note: expected ‘p4d_t *’ {aka ‘struct <anonymous> *’} but argument is of type ‘pgd_t *’ {aka ‘struct <anonymous> *’}
 static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
                                 ~~~~~~~^~~
cc1: some warnings being treated as errors
make[3]: *** [scripts/Makefile.build:280: /root/kexec-mod/kernel/arch/arm64/idmap.o] Error 1
make[2]: *** [scripts/Makefile.build:497: /root/kexec-mod/kernel/arch/arm64] Error 2
make[1]: *** [Makefile:1825: /root/kexec-mod/kernel] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-5.10.63-v8+'
make: *** [Makefile:15: module] Error 2

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