[PATCH 1/3] selftests/bpf: Makefile: add includes to fix broken test build

[Sirio Balmelli <sirio@b-ad.ch>]

several bpf tests fail to build with clang 7.0.0:
...
In file included from ../../../include/uapi/linux/bpf.h:11:
In file included from ./include/uapi/linux/types.h:5:
/usr/include/asm-generic/int-ll64.h:11:10: fatal error: 'asm/bitsperlong.h' file not found

/usr/include/asm-generic/int-ll64.h is from outside the kernel repo,
probably a good idea to repoint to -I$(ROOT)/include/uapi.
asm/bitsperlong.h is architecture-specific, cater for this with an
architecture-specific include -I$(ROOT)/$(ARCH)/include/uapi.

Re-building now yields:
../../../../include/uapi/linux/stddef.h:2:10: fatal error: 'linux/compiler_types.h' file not found

Fix this with -I$(ROOT)/include

Signed-off-by: Sirio Balmelli <sirio@b-ad.ch>
---
 tools/testing/selftests/bpf/Makefile | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 0b72cc7..6a8cfaf 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -80,8 +80,14 @@ else
   CPU ?= generic
 endif
 
-CLANG_FLAGS = -I. -I./include/uapi -I../../../include/uapi \
-	      -Wno-compare-distinct-pointer-types
+ARCH := arch/$(subst _64,,$(shell uname -p))
+ROOT :=../../../..
+TOOLS :=../../..
+CLANG_FLAGS = -I. -I./include/uapi \
+	-I$(TOOLS)/include/uapi -I$(TOOLS)/include \
+	-I$(ROOT)/$(ARCH)/include/uapi \
+	-I$(ROOT)/include/uapi -I$(ROOT)/include \
+	-Wno-compare-distinct-pointer-types
 
 $(OUTPUT)/test_l4lb_noinline.o: CLANG_FLAGS += -fno-inline
 $(OUTPUT)/test_xdp_noinline.o: CLANG_FLAGS += -fno-inline
-- 
2.7.4