Yonghong Song d14ea4b0d8 selftests/bpf: Fix pyperf180 compilation failure with clang18 ... [ Upstream commit 100888fb6d ] With latest clang18 (main branch of llvm-project repo), when building bpf selftests, [~/work/bpf-next (master)]$ make -C tools/testing/selftests/bpf LLVM=1 -j The following compilation error happens: fatal error: error in backend: Branch target out of insn range ... Stack dump: 0. Program arguments: clang -g -Wall -Werror -D__TARGET_ARCH_x86 -mlittle-endian -I/home/yhs/work/bpf-next/tools/testing/selftests/bpf/tools/include -I/home/yhs/work/bpf-next/tools/testing/selftests/bpf -I/home/yhs/work/bpf-next/tools/include/uapi -I/home/yhs/work/bpf-next/tools/testing/selftests/usr/include -idirafter /home/yhs/work/llvm-project/llvm/build.18/install/lib/clang/18/include -idirafter /usr/local/include -idirafter /usr/include -Wno-compare-distinct-pointer-types -DENABLE_ATOMICS_TESTS -O2 --target=bpf -c progs/pyperf180.c -mcpu=v3 -o /home/yhs/work/bpf-next/tools/testing/selftests/bpf/pyperf180.bpf.o 1. <eof> parser at end of file 2. Code generation ... The compilation failure only happens to cpu=v2 and cpu=v3. cpu=v4 is okay since cpu=v4 supports 32-bit branch target offset. The above failure is due to upstream llvm patch [1] where some inlining behavior are changed in clang18. To workaround the issue, previously all 180 loop iterations are fully unrolled. The bpf macro __BPF_CPU_VERSION__ (implemented in clang18 recently) is used to avoid unrolling changes if cpu=v4. If __BPF_CPU_VERSION__ is not available and the compiler is clang18, the unrollng amount is unconditionally reduced. [1] 1a2e77cf9e Signed-off-by: Yonghong Song <yonghong.song@linux.dev> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Tested-by: Alan Maguire <alan.maguire@oracle.com> Link: https://lore.kernel.org/bpf/20231110193644.3130906-1-yonghong.song@linux.dev Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-02-05 20:14:18 +00:00
..
crypto/chacha20-s390
cxl	cxl: Add cxl_num_decoders_committed() usage to cxl_test	2024-01-10 17:17:02 +01:00
fault-injection
ktest
kunit	kunit: tool: fix parsing of test attributes	2024-02-05 20:14:15 +00:00
memblock	memblock tests: fix warning ‘struct seq_file’ declared inside parameter list	2023-09-14 10:51:28 +03:00
nvdimm	tools/testing/nvdimm: Drop empty platform remove function	2023-06-07 13:30:21 -07:00
radix-tree	maple_tree: do not preallocate nodes for slot stores	2024-01-05 15:19:43 +01:00
scatterlist
selftests	selftests/bpf: Fix pyperf180 compilation failure with clang18	2024-02-05 20:14:18 +00:00
vsock	vsock/test: fix SEQPACKET message bounds test	2023-12-03 07:33:05 +01:00