kselftests: hid: fix missing headers_install step

The Makefile was assuming that headers_install was already done in
the top source directory, and was searching for installed uapi headers
there.
Unfortunately this is not the case and we need to manually call that step.

To do so, reorder the declaration of the variables, and reuses top_srcdir
provided by lib.mk
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/all/202212060216.a6X8Py5H-lkp@intel.com/#tSigned-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Reviewed-by: Jiri Kosina <jkosina@suse.cz>
Link: https://lore.kernel.org/r/20221206145936.922196-6-benjamin.tissoires@redhat.com

tools/testing/selftests/hid/Makefile

@@ -7,17 +7,9 @@ include ../../../scripts/Makefile.include
 
 CXX ?= $(CROSS_COMPILE)g++
 
-CURDIR := $(abspath .)
-TOOLSDIR := $(abspath ../../..)
-TOP_SRCDIR = $(CURDIR)/../../../..
-KHDR_INCLUDES := $(TOP_SRCDIR)/usr/include
-LIBDIR := $(TOOLSDIR)/lib
-BPFDIR := $(LIBDIR)/bpf
-TOOLSINCDIR := $(TOOLSDIR)/include
-BPFTOOLDIR := $(TOOLSDIR)/bpf/bpftool
 HOSTPKG_CONFIG := pkg-config
 
-CFLAGS += -g -O0 -rdynamic -Wall -Werror -I$(KHDR_INCLUDES)
+CFLAGS += -g -O0 -rdynamic -Wall -Werror -I$(KHDR_INCLUDES) -I$(OUTPUT)
 LDLIBS += -lelf -lz -lrt -lpthread
 
 # Silence some warnings when compiled with clang
@@ -53,9 +45,15 @@ endef
 
 include ../lib.mk
 
+TOOLSDIR := $(top_srcdir)/tools
+LIBDIR := $(TOOLSDIR)/lib
+BPFDIR := $(LIBDIR)/bpf
+TOOLSINCDIR := $(TOOLSDIR)/include
+BPFTOOLDIR := $(TOOLSDIR)/bpf/bpftool
 SCRATCH_DIR := $(OUTPUT)/tools
 BUILD_DIR := $(SCRATCH_DIR)/build
 INCLUDE_DIR := $(SCRATCH_DIR)/include
+KHDR_INCLUDES := $(SCRATCH_DIR)/uapi/include
 BPFOBJ := $(BUILD_DIR)/libbpf/libbpf.a
 ifneq ($(CROSS_COMPILE),)
 HOST_BUILD_DIR		:= $(BUILD_DIR)/host
@@ -122,7 +120,6 @@ $(DEFAULT_BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile)    \
 		    prefix= DESTDIR=$(HOST_SCRATCH_DIR)/ install-bin
 
 $(BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile)		       \
-	   $(KHDR_INCLUDES)/linux/bpf.h					       \
 	   | $(BUILD_DIR)/libbpf
 	$(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) OUTPUT=$(BUILD_DIR)/libbpf/ \
 		    EXTRA_CFLAGS='-g -O0'				       \
@@ -130,7 +127,6 @@ $(BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile)		       \
 
 ifneq ($(BPFOBJ),$(HOST_BPFOBJ))
 $(HOST_BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile)		       \
-		$(KHDR_INCLUDES)/linux/bpf.h					       \
 		| $(HOST_BUILD_DIR)/libbpf
 	$(Q)$(MAKE) $(submake_extras) -C $(BPFDIR)                             \
 		    EXTRA_CFLAGS='-g -O0' ARCH= CROSS_COMPILE=		       \
@@ -147,6 +143,9 @@ else
 	$(Q)cp "$(VMLINUX_H)" $@
 endif
 
+$(KHDR_INCLUDES)/linux/hid.h: $(top_srcdir)/include/uapi/linux/hid.h
+	$(MAKE) -C $(top_srcdir) INSTALL_HDR_PATH=$(SCRATCH_DIR)/uapi headers_install
+
 $(RESOLVE_BTFIDS): $(HOST_BPFOBJ) | $(HOST_BUILD_DIR)/resolve_btfids	\
 		       $(TOOLSDIR)/bpf/resolve_btfids/main.c	\
 		       $(TOOLSDIR)/lib/rbtree.c			\
@@ -178,8 +177,7 @@ MENDIAN=$(if $(IS_LITTLE_ENDIAN),-mlittle-endian,-mbig-endian)
 
 CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG))
 BPF_CFLAGS = -g -Werror -D__TARGET_ARCH_$(SRCARCH) $(MENDIAN) 		\
-	     -I$(INCLUDE_DIR) -I$(CURDIR) -I$(KHDR_INCLUDES)		\
-	     -I$(abspath $(OUTPUT)/../usr/include)
+	     -I$(INCLUDE_DIR)
 
 CLANG_CFLAGS = $(CLANG_SYS_INCLUDES) \
 	       -Wno-compare-distinct-pointer-types
@@ -225,7 +223,7 @@ $(BPF_SKELS): %.skel.h: %.bpf.o $(BPFTOOL) | $(OUTPUT)
 	$(Q)$(BPFTOOL) gen object $(<:.o=.linked1.o) $<
 	$(Q)$(BPFTOOL) gen skeleton $(<:.o=.linked1.o) name $(notdir $(<:.bpf.o=)) > $@
 
-$(OUTPUT)/%:%.c $(BPF_SKELS)
+$(OUTPUT)/%:%.c $(BPF_SKELS) $(KHDR_INCLUDES)/linux/hid.h
 	$(call msg,BINARY,,$@)
 	$(Q)$(LINK.c) $^ $(LDLIBS) -o $@