samples/bpf: Clean up samples/bpf build failes

[ Upstream commit 527024f7aeb683ce7ef49b07ef7ce9ecf015288d ]

Remove xdp_samples_user.o rule redefinition which generates Makefile
warning and instead override TPROGS_CFLAGS. This seems to work fine when
building inside selftests/bpf.

That was one big head-scratcher before I found that generic
Makefile.target hid this surprising specialization for for xdp_samples_user.o.

Main change is to use actual locally installed libbpf headers.

Also drop printk macro re-definition (not even used!).

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20211201232824.3166325-8-andrii@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index 01993b5..8ac8573 100644 (file)
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -325,7 +325,7 @@ $(BPF_SAMPLES_PATH)/*.c: verify_target_bpf $(LIBBPF)
 $(src)/*.c: verify_target_bpf $(LIBBPF)
 
 libbpf_hdrs: $(LIBBPF)
-$(obj)/$(TRACE_HELPERS): | libbpf_hdrs
+$(obj)/$(TRACE_HELPERS) $(obj)/$(CGROUP_HELPERS) $(obj)/$(XDP_SAMPLE): | libbpf_hdrs
 
 .PHONY: libbpf_hdrs
 
@@ -340,6 +340,17 @@ $(obj)/hbm_out_kern.o: $(src)/hbm.h $(src)/hbm_kern.h
 $(obj)/hbm.o: $(src)/hbm.h
 $(obj)/hbm_edt_kern.o: $(src)/hbm.h $(src)/hbm_kern.h
 
+# Override includes for xdp_sample_user.o because $(srctree)/usr/include in
+# TPROGS_CFLAGS causes conflicts
+XDP_SAMPLE_CFLAGS += -Wall -O2 -lm \
+                    -I$(src)/../../tools/include \
+                    -I$(src)/../../tools/include/uapi \
+                    -I$(LIBBPF_INCLUDE) \
+                    -I$(src)/../../tools/testing/selftests/bpf
+
+$(obj)/$(XDP_SAMPLE): TPROGS_CFLAGS = $(XDP_SAMPLE_CFLAGS)
+$(obj)/$(XDP_SAMPLE): $(src)/xdp_sample_user.h $(src)/xdp_sample_shared.h
+
 -include $(BPF_SAMPLES_PATH)/Makefile.target
 
 VMLINUX_BTF_PATHS ?= $(abspath $(if $(O),$(O)/vmlinux))                                \

diff --git a/samples/bpf/Makefile.target b/samples/bpf/Makefile.target
index 5a368af..7621f55 100644 (file)
--- a/samples/bpf/Makefile.target
+++ b/samples/bpf/Makefile.target
@@ -73,14 +73,3 @@ quiet_cmd_tprog-cobjs        = CC  $@
       cmd_tprog-cobjs  = $(CC) $(tprogc_flags) -c -o $@ $<
 $(tprog-cobjs): $(obj)/%.o: $(src)/%.c FORCE
        $(call if_changed_dep,tprog-cobjs)
-
-# Override includes for xdp_sample_user.o because $(srctree)/usr/include in
-# TPROGS_CFLAGS causes conflicts
-XDP_SAMPLE_CFLAGS += -Wall -O2 -lm \
-                    -I./tools/include \
-                    -I./tools/include/uapi \
-                    -I./tools/lib \
-                    -I./tools/testing/selftests/bpf
-$(obj)/xdp_sample_user.o: $(src)/xdp_sample_user.c \
-       $(src)/xdp_sample_user.h $(src)/xdp_sample_shared.h
-       $(CC) $(XDP_SAMPLE_CFLAGS) -c -o $@ $<

diff --git a/samples/bpf/hbm_kern.h b/samples/bpf/hbm_kern.h
index 722b3fa..1752a46 100644 (file)
--- a/samples/bpf/hbm_kern.h
+++ b/samples/bpf/hbm_kern.h
@@ -9,8 +9,6 @@
  * Include file for sample Host Bandwidth Manager (HBM) BPF programs
  */
 #define KBUILD_MODNAME "foo"
-#include <stddef.h>
-#include <stdbool.h>
 #include <uapi/linux/bpf.h>
 #include <uapi/linux/if_ether.h>
 #include <uapi/linux/if_packet.h>

diff --git a/samples/bpf/lwt_len_hist_kern.c b/samples/bpf/lwt_len_hist_kern.c
index 9ed63e1..1fa14c5 100644 (file)
--- a/samples/bpf/lwt_len_hist_kern.c
+++ b/samples/bpf/lwt_len_hist_kern.c
@@ -16,13 +16,6 @@
 #include <uapi/linux/in.h>
 #include <bpf/bpf_helpers.h>
 
-# define printk(fmt, ...)                                              \
-               ({                                                      \
-                       char ____fmt[] = fmt;                           \
-                       bpf_trace_printk(____fmt, sizeof(____fmt),      \
-                                    ##__VA_ARGS__);                    \
-               })
-
 struct bpf_elf_map {
        __u32 type;
        __u32 size_key;