selftests/bpf: Enforce no-ALU32 for test_progs-no_alu32 (24f65050) · Commits · 戴 / test

With the most recent Clang, alu32 is enabled by default if -mcpu=probe or -mcpu=v3 is specified. Use a separate build rule with -mcpu=v2 to enforce no ALU32 mode. Suggested-by:

Yonghong Song <yhs@fb.com> Signed-off-by:

Andrii Nakryiko <andriin@fb.com> Signed-off-by:

Alexei Starovoitov <ast@kernel.org> Acked-by:

Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20191120002510.4130605-1-andriin@fb.com

tools/testing/selftests/bpf/Makefile

+7 −0

Original line number	Diff line number	Diff line
		@@ -163,6 +163,12 @@ define CLANG_BPF_BUILD_RULE
		-c $1 -o - \|\| echo "BPF obj compilation failed") \| \
		$(LLC) -march=bpf -mcpu=probe $4 -filetype=obj -o $2
		endef
		# Similar to CLANG_BPF_BUILD_RULE, but with disabled alu32
		define CLANG_NOALU32_BPF_BUILD_RULE
		($(CLANG) $3 -O2 -target bpf -emit-llvm \
		-c $1 -o - \|\| echo "BPF obj compilation failed") \| \
		$(LLC) -march=bpf -mcpu=v2 $4 -filetype=obj -o $2
		endef
		# Similar to CLANG_BPF_BUILD_RULE, but using native Clang and bpf LLC
		define CLANG_NATIVE_BPF_BUILD_RULE
		($(CLANG) $3 -O2 -emit-llvm \
		@@ -275,6 +281,7 @@ TRUNNER_BPF_LDFLAGS := -mattr=+alu32
		$(eval $(call DEFINE_TEST_RUNNER,test_progs))

		# Define test_progs-no_alu32 test runner.
		TRUNNER_BPF_BUILD_RULE := CLANG_NOALU32_BPF_BUILD_RULE
		TRUNNER_BPF_LDFLAGS :=
		$(eval $(call DEFINE_TEST_RUNNER,test_progs,no_alu32))

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