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authorKumar Kartikeya Dwivedi <memxor@gmail.com>2021-09-28 11:16:08 +0530
committerAndrii Nakryiko <andrii@kernel.org>2021-09-28 17:21:35 -0700
commit571fa247ab411f3233eeaaf837c6e646a513b9f8 (patch)
tree338b25807575e4387e3cfd7cb15763bd11452e61 /samples/bpf/Makefile
parent4ccb9f03fee7b20484187ba7e25a7b9b79fe63d5 (diff)
samples: bpf: Fix vmlinux.h generation for XDP samples
Generate vmlinux.h only from the in-tree vmlinux, and remove enum declarations that would cause a build failure in case of version mismatches. There are now two options when building the samples: 1. Compile the kernel to use in-tree vmlinux for vmlinux.h 2. Override VMLINUX_BTF for samples using something like this: make VMLINUX_BTF=/sys/kernel/btf/vmlinux -C samples/bpf This change was tested with relative builds, e.g. cases like: * make O=build -C samples/bpf * make KBUILD_OUTPUT=build -C samples/bpf * make -C samples/bpf * cd samples/bpf && make When a suitable VMLINUX_BTF is not found, the following message is printed: /home/kkd/src/linux/samples/bpf/Makefile:333: *** Cannot find a vmlinux for VMLINUX_BTF at any of " ./vmlinux", build the kernel or set VMLINUX_BTF variable. Stop. Fixes: 384b6b3bbf0d (samples: bpf: Add vmlinux.h generation support) Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Toke Høiland-Jørgensen <toke@redhat.com> Link: https://lore.kernel.org/bpf/20210928054608.1799021-1-memxor@gmail.com
Diffstat (limited to 'samples/bpf/Makefile')
-rw-r--r--samples/bpf/Makefile17
1 files changed, 8 insertions, 9 deletions
diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index 4dc20be5fb96..5fd48a8d4f10 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -322,17 +322,11 @@ $(obj)/hbm_edt_kern.o: $(src)/hbm.h $(src)/hbm_kern.h
-include $(BPF_SAMPLES_PATH)/Makefile.target
-VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux) \
- $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux) \
- ../../../../vmlinux \
- /sys/kernel/btf/vmlinux \
- /boot/vmlinux-$(shell uname -r)
+VMLINUX_BTF_PATHS ?= $(abspath $(if $(O),$(O)/vmlinux)) \
+ $(abspath $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux)) \
+ $(abspath ./vmlinux)
VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))
-ifeq ($(VMLINUX_BTF),)
-$(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)")
-endif
-
$(obj)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL)
ifeq ($(VMLINUX_H),)
$(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@
@@ -340,6 +334,11 @@ else
$(Q)cp "$(VMLINUX_H)" $@
endif
+ifeq ($(VMLINUX_BTF),)
+ $(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)",\
+ build the kernel or set VMLINUX_BTF variable)
+endif
+
clean-files += vmlinux.h
# Get Clang's default includes on this system, as opposed to those seen by