Hi All,

I am trying to build kselftest on Linux-5.4-rc3+ on ubuntu 18.04. I installed LLVM-9.0.0 and Clang-9.0.0 from below links after following steps from [1] because of discussion [2]

https://releases.llvm.org/9.0.0/llvm-9.0.0.src.tar.xz https://releases.llvm.org/9.0.0/clang-tools-extra-9.0.0.src.tar.xz https://releases.llvm.org/9.0.0/cfe-9.0.0.src.tar.xz

After that I started this error. make[2]: Leaving directory '/usr/src/tovards/linux/tools/lib/bpf' (clang -I. -I./include/uapi -I../../../include/uapi -I/usr/src/tovards/linux/tools/testing/selftests/bpf/../usr/include -D__TARGET_ARCH_arm64 -idirafter /usr/local/include -idirafter /usr/local/lib/clang/9.0.0/include -idirafter /usr/include/aarch64-linux-gnu -idirafter /usr/include -Wno-compare-distinct-pointer-types -O2 -target bpf -emit-llvm \ -c progs/test_core_reloc_ints.c -o - || echo "clang failed") | \ llc -march=arm64 -mcpu=generic -filetype=obj -o /usr/src/tovards/linux/tools/testing/selftests/bpf/test_core_reloc_ints.o progs/test_core_reloc_ints.c:32:6: error: using builtin_preserve_access_index() without -g if (BPF_CORE_READ(&out->u8_field, &in->u8_field) || ^ ./bpf_helpers.h:533:10: note: expanded from macro 'BPF_CORE_READ' __builtin_preserve_access_index(src)) ^ progs/test_core_reloc_ints.c:33:6: error: using builtin_preserve_access_index() without -g BPF_CORE_READ(&out->s8_field, &in->s8_field) || ^ ./bpf_helpers.h:533:10: note: expanded from macro 'BPF_CORE_READ' __builtin_preserve_access_index(src)) ^ progs/test_core_reloc_ints.c:34:6: error: using builtin_preserve_access_index() without -g BPF_CORE_READ(&out->u16_field, &in->u16_field) || ^ ./bpf_helpers.h:533:10: note: expanded from macro 'BPF_CORE_READ' __builtin_preserve_access_index(src)) ^ progs/test_core_reloc_ints.c:35:6: error: using builtin_preserve_access_index() without -g BPF_CORE_READ(&out->s16_field, &in->s16_field) || ^ ./bpf_helpers.h:533:10: note: expanded from macro 'BPF_CORE_READ' __builtin_preserve_access_index(src)) ^ progs/test_core_reloc_ints.c:36:6: error: using builtin_preserve_access_index() without -g BPF_CORE_READ(&out->u32_field, &in->u32_field) || ^ ./bpf_helpers.h:533:10: note: expanded from macro 'BPF_CORE_READ' __builtin_preserve_access_index(src)) ^ progs/test_core_reloc_ints.c:37:6: error: using builtin_preserve_access_index() without -g BPF_CORE_READ(&out->s32_field, &in->s32_field) || ^ ./bpf_helpers.h:533:10: note: expanded from macro 'BPF_CORE_READ' __builtin_preserve_access_index(src)) ^ progs/test_core_reloc_ints.c:38:6: error: using builtin_preserve_access_index() without -g BPF_CORE_READ(&out->u64_field, &in->u64_field) || ^ ./bpf_helpers.h:533:10: note: expanded from macro 'BPF_CORE_READ' __builtin_preserve_access_index(src)) ^ progs/test_core_reloc_ints.c:39:6: error: using builtin_preserve_access_index() without -g BPF_CORE_READ(&out->s64_field, &in->s64_field)) ^ ./bpf_helpers.h:533:10: note: expanded from macro 'BPF_CORE_READ' __builtin_preserve_access_index(src)) ^ 8 errors generated. llc: error: llc: <stdin>:1:1: error: expected top-level entity clang failed

In order to solve this error, I modifed bpf/Makefile as CLANG_CFLAGS = $(CLANG_SYS_INCLUDES) \ - -Wno-compare-distinct-pointer-types + -Wno-compare-distinct-pointer-types -g

Now I am getting this error

(clang -I. -I./include/uapi -I../../../include/uapi -I/usr/src/tovards/linux/tools/testing/selftests/bpf/../usr/include -D__TARGET_ARCH_arm64 -idirafter /usr/local/include -idirafter /usr/local/lib/clang/9.0.0/include -idirafter /usr/include/aarch64-linux-gnu -idirafter /usr/include -Wno-compare-distinct-pointer-types -g -O2 -target bpf -emit-llvm \ -c progs/test_core_reloc_ints.c -o - || echo "clang failed") | \ llc -march=arm64 -mcpu=generic -filetype=obj -o /usr/src/tovards/linux/tools/testing/selftests/bpf/test_core_reloc_ints.o LLVM ERROR: Cannot select: intrinsic %llvm.preserve.struct.access.index Makefile:267: recipe for target '/usr/src/tovards/linux/tools/testing/selftests/bpf/test_core_reloc_ints.o' failed make[1]: *** [/usr/src/tovards/linux/tools/testing/selftests/bpf/test_core_reloc_ints.o] Error 1

Please suggest!!

--prabhakar(pk)

[1] https://stackoverflow.com/questions/47255526/how-to-build-the-latest-clang-t...

[2] https://www.mail-archive.com/netdev@vger.kernel.org/msg315096.html

Linux top-commit ---------------- commit bc88f85c6c09306bd21917e1ae28205e9cd775a7 (HEAD -> master, origin/master, origin/HEAD) Author: Ben Dooks ben.dooks@codethink.co.uk Date: Wed Oct 16 12:24:58 2019 +0100

kthread: make __kthread_queue_delayed_work static

The __kthread_queue_delayed_work is not exported so make it static, to avoid the following sparse warning:

kernel/kthread.c:869:6: warning: symbol '__kthread_queue_delayed_work' was not declared. Should it be static?

Signed-off-by: Ben Dooks ben.dooks@codethink.co.uk Signed-off-by: Linus Torvalds torvalds@linux-foundation.org