bpf: samples: exclude asm/sysreg.h for arm64 (30b50aa6) · Commits · 戴 / test

commit ("arm64: kernel: Add support for Privileged Access Never") includes sysreg.h into futex.h and uaccess.h. But, the inline assembly used by asm/sysreg.h is incompatible with llvm so it will cause BPF samples build failure for ARM64. Since sysreg.h is useless for BPF samples, just exclude it from Makefile via defining __ASM_SYSREG_H. Signed-off-by:

Yang Shi <yang.shi@linaro.org> Acked-by:

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

David S. Miller <davem@davemloft.net>

samples/bpf/Makefile

+5 −2

Original line number	Diff line number	Diff line
		@@ -67,10 +67,13 @@ HOSTLOADLIBES_lathist += -lelf
		# point this to your LLVM backend with bpf support
		LLC=$(srctree)/tools/bpf/llvm/bld/Debug+Asserts/bin/llc

		# asm/sysreg.h inline assmbly used by it is incompatible with llvm.
		# But, ehere is not easy way to fix it, so just exclude it since it is
		# useless for BPF samples.
		$(obj)/%.o: $(src)/%.c
		clang $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(EXTRA_CFLAGS) \
		-D__KERNEL__ -Wno-unused-value -Wno-pointer-sign \
		-D__KERNEL__ -D__ASM_SYSREG_H -Wno-unused-value -Wno-pointer-sign \
		-O2 -emit-llvm -c $< -o -\| $(LLC) -march=bpf -filetype=obj -o $@
		clang $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(EXTRA_CFLAGS) \
		-D__KERNEL__ -Wno-unused-value -Wno-pointer-sign \
		-D__KERNEL__ -D__ASM_SYSREG_H -Wno-unused-value -Wno-pointer-sign \
		-O2 -emit-llvm -c $< -o -\| $(LLC) -march=bpf -filetype=asm -o $@.s

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