selftests/bpf: Specify libbpf headers required for %.bpf.o progs

Test %.bpf.o objects actually depend only on some libbpf headers.
Define a list of required headers and use it as TRUNNER_BPF_OBJS
dependency.

bpf_*.h list was determined by:

    $ grep -rh 'include <bpf/bpf_' progs | sort -u

Signed-off-by: Ihor Solodrai <ihor.solodrai@pm.me>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link:
Link: https://lore.kernel.org/bpf/20240828174608.377204-1-ihor.solodrai@pm.me
https://lore.kernel.org/bpf/CAEf4BzYQ-j2i_xjs94Nn=8+FVfkWt51mLZyiYKiz9oA4Z=pCeA@mail.gmail.com/

diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index c120617..53cc13b 100644 (file)
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -516,6 +516,12 @@ xdp_features.skel.h-deps := xdp_features.bpf.o
 LINKED_BPF_OBJS := $(foreach skel,$(LINKED_SKELS),$($(skel)-deps))
 LINKED_BPF_SRCS := $(patsubst %.bpf.o,%.c,$(LINKED_BPF_OBJS))
 
+HEADERS_FOR_BPF_OBJS := $(wildcard $(BPFDIR)/*.bpf.h)          \
+                       $(addprefix $(BPFDIR)/, bpf_core_read.h \
+                                               bpf_endian.h    \
+                                               bpf_helpers.h   \
+                                               bpf_tracing.h)
+
 # Set up extra TRUNNER_XXX "temporary" variables in the environment (relies on
 # $eval()) and pass control to DEFINE_TEST_RUNNER_RULES.
 # Parameters:
@@ -566,8 +572,7 @@ $(TRUNNER_BPF_OBJS): $(TRUNNER_OUTPUT)/%.bpf.o:                             \
                     $(TRUNNER_BPF_PROGS_DIR)/%.c                       \
                     $(TRUNNER_BPF_PROGS_DIR)/*.h                       \
                     $$(INCLUDE_DIR)/vmlinux.h                          \
-                    $(wildcard $(BPFDIR)/bpf_*.h)                      \
-                    $(wildcard $(BPFDIR)/*.bpf.h)                      \
+                    $(HEADERS_FOR_BPF_OBJS)                            \
                     | $(TRUNNER_OUTPUT) $$(BPFOBJ)
        $$(call $(TRUNNER_BPF_BUILD_RULE),$$<,$$@,                      \
                                          $(TRUNNER_BPF_CFLAGS)         \