Hello, all I have a strange problem in building the linux kernel from ubuntu. (I want to replace the kernel in ubuntu to debug install failure on qemu virtual machine) I downloaded ubuntu source by "git clone git://kernel.ubuntu.com/ubuntu/ubuntu-focal.git". and because I wanted to use a specific version, I did "git checkout Ubuntu-5.4.0-42.46" (this version is the one used in a ubuntu installation .iso. And you can see related askubuntu question here : https://askubuntu.com/questions/1347390/what-ubuntu-source-version-should-i- use-to-add-some-debug-prints-for-ubuntu-bo ) After git-checkout, the `git log` shows this result : commit 98c4545e2d65ed35c31056f72c4da20f6b5ea0d0 (HEAD, tag: Ubuntu-5.4.0-42.46) Author: Khalid Elmously <khalid.elmously@canonical.com> Date: Thu Jul 9 19:50:26 2020 -0400 UBUNTU: Ubuntu-5.4.0-42.46 Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com> To build the kernel, I did `ARCH=arm64 CROSS_COMPILE=aarch64-none-elf- make defconfig` and `ARCH=arm64 CROSS_COMPILE=aarch64-none-elf- make -j24 Image`. But this gives me a compile error below. What can be wrong? . . CC mm/interval_tree.o CC drivers/base/regmap/regcache.o CC kernel/time/posix-cpu-timers.o CC mm/list_lru.o CC block/blk-mq.o AS arch/arm64/lib/memchr.o CC fs/ext4/migrate.o security/security.c: In function 'security_add_hooks': security/security.c:477:25: error: 'struct security_hook_heads' has no member named 'socket_getpeersec_stream' 477 | &security_hook_heads.socket_getpeersec_stream) | ^ CC kernel/time/posix-clock.o AS arch/arm64/lib/memcmp.o security/security.c: In function 'security_setprocattr': CC arch/arm64/kvm/../../../virt/kvm/arm/vgic/vgic-v2.o security/security.c:2058:27: error: 'union security_list_options' has no member named 'socket_getpeersec_stream' 2058 | socket_getpeersec_stream.socket_getpeersec_stream = NULL; | ^ In file included from ./include/linux/timer.h:5, from ./include/linux/workqueue.h:9, from ./include/linux/bpf.h:9, from security/security.c:13: security/security.c:2060:25: error: 'struct security_hook_heads' has no member named 'socket_getpeersec_stream' 2060 | &security_hook_heads.socket_getpeersec_stream, | ^ ./include/linux/list.h:857:12: note: in definition of macro 'hlist_entry_safe' 857 | ({ typeof(ptr) ____ptr = (ptr); \ | ^~~ security/security.c:2059:3: note: in expansion of macro 'hlist_for_each_entry' 2059 | hlist_for_each_entry(hp, | ^~~~~~~~~~~~~~~~~~~~ security/security.c:2060:25: error: 'struct security_hook_heads' has no member named 'socket_getpeersec_stream' 2060 | &security_hook_heads.socket_getpeersec_stream, | ^ ./include/linux/list.h:857:28: note: in definition of macro 'hlist_entry_safe' 857 | ({ typeof(ptr) ____ptr = (ptr); \ | ^~~ security/security.c:2059:3: note: in expansion of macro 'hlist_for_each_entry' 2059 | hlist_for_each_entry(hp, | ^~~~~~~~~~~~~~~~~~~~ In file included from ./include/linux/list.h:9, from ./include/linux/timer.h:5, from ./include/linux/workqueue.h:9, from ./include/linux/bpf.h:9, from security/security.c:13: ./include/linux/kernel.h:993:17: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] 993 | void *__mptr = (void *)(ptr); \ | ^ ./include/linux/list.h:847:40: note: in expansion of macro 'container_of' 847 | #define hlist_entry(ptr, type, member) container_of(ptr,type,member) | ^~~~~~~~~~~~ . . BTW, when I do the same with linux-5.4.21 vanila source, it compiles ok. Can anyone give me an advice? Could this Ubuntu-5.4.0-42.46 version have a bug and maybe I need a patch? Thank you! Chan Kim