selftests: add headers_install to lib.mk

If the kernel headers aren't installed we can't build all the tests.
Add a new make target rule 'khdr' in the file lib.mk to generate the
kernel headers and that gets include for every test-dir Makefile that
includes lib.mk If the testdir in turn have its own sub-dirs the
top_srcdir needs to be set to the linux-rootdir to be able to generate
the kernel headers.

Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
Reviewed-by: Fathi Boudra <fathi.boudra@linaro.org>
Signed-off-by: Shuah Khan (Samsung OSG) <shuah@kernel.org>

tools/testing/selftests/android/Makefile

@@ -6,7 +6,7 @@ TEST_PROGS := run.sh
 
 include ../lib.mk
 
-all:
+all: khdr
 	@for DIR in $(SUBDIRS); do		\
 		BUILD_TARGET=$(OUTPUT)/$$DIR;	\
 		mkdir $$BUILD_TARGET  -p;	\

tools/testing/selftests/android/ion/Makefile

@@ -10,6 +10,8 @@ $(TEST_GEN_FILES): ipcsocket.c ionutils.c
 
 TEST_PROGS := ion_test.sh
 
+KSFT_KHDR_INSTALL := 1
+top_srcdir = ../../../../..
 include ../../lib.mk
 
 $(OUTPUT)/ionapp_export: ionapp_export.c ipcsocket.c ionutils.c

tools/testing/selftests/futex/functional/Makefile

@@ -18,6 +18,7 @@ TEST_GEN_FILES := \
 
 TEST_PROGS := run.sh
 
+top_srcdir = ../../../../..
 include ../../lib.mk
 
 $(TEST_GEN_FILES): $(HEADERS)

tools/testing/selftests/gpio/Makefile

@@ -21,11 +21,8 @@ endef
 CFLAGS += -O2 -g -std=gnu99 -Wall -I../../../../usr/include/
 LDLIBS += -lmount -I/usr/include/libmount
 
-$(BINARIES): ../../../gpio/gpio-utils.o ../../../../usr/include/linux/gpio.h
+$(BINARIES):| khdr
+$(BINARIES): ../../../gpio/gpio-utils.o
 
 ../../../gpio/gpio-utils.o:
 	make ARCH=$(ARCH) CROSS_COMPILE=$(CROSS_COMPILE) -C ../../../gpio
-
-../../../../usr/include/linux/gpio.h:
-	make -C ../../../.. headers_install INSTALL_HDR_PATH=$(shell pwd)/../../../../usr/
-

tools/testing/selftests/kvm/Makefile

@@ -37,9 +37,6 @@ $(LIBKVM_OBJ): $(OUTPUT)/%.o: %.c
 $(OUTPUT)/libkvm.a: $(LIBKVM_OBJ)
 	$(AR) crs $@ $^
 
-$(LINUX_HDR_PATH):
-	make -C $(top_srcdir) headers_install
-
-all: $(STATIC_LIBS) $(LINUX_HDR_PATH)
+all: $(STATIC_LIBS)
 $(TEST_GEN_PROGS): $(STATIC_LIBS)
-$(TEST_GEN_PROGS) $(LIBKVM_OBJ): | $(LINUX_HDR_PATH)
+$(STATIC_LIBS):| khdr

tools/testing/selftests/lib.mk

@@ -16,8 +16,20 @@ TEST_GEN_PROGS := $(patsubst %,$(OUTPUT)/%,$(TEST_GEN_PROGS))
 TEST_GEN_PROGS_EXTENDED := $(patsubst %,$(OUTPUT)/%,$(TEST_GEN_PROGS_EXTENDED))
 TEST_GEN_FILES := $(patsubst %,$(OUTPUT)/%,$(TEST_GEN_FILES))
 
+top_srcdir ?= ../../../..
+include $(top_srcdir)/scripts/subarch.include
+ARCH		?= $(SUBARCH)
+
 all: $(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED) $(TEST_GEN_FILES)
 
+.PHONY: khdr
+khdr:
+	make ARCH=$(ARCH) -C $(top_srcdir) headers_install
+
+ifdef KSFT_KHDR_INSTALL
+$(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED) $(TEST_GEN_FILES):| khdr
+endif
+
 .ONESHELL:
 define RUN_TEST_PRINT_RESULT
 	TEST_HDR_MSG="selftests: "`basename $$PWD`:" $$BASENAME_TEST";	\

tools/testing/selftests/net/Makefile

@@ -15,6 +15,7 @@ TEST_GEN_FILES += udpgso udpgso_bench_tx udpgso_bench_rx
 TEST_GEN_PROGS = reuseport_bpf reuseport_bpf_cpu reuseport_bpf_numa
 TEST_GEN_PROGS += reuseport_dualstack reuseaddr_conflict tls
 
+KSFT_KHDR_INSTALL := 1
 include ../lib.mk
 
 $(OUTPUT)/reuseport_bpf_numa: LDFLAGS += -lnuma

tools/testing/selftests/networking/timestamping/Makefile

@@ -5,6 +5,7 @@ TEST_PROGS := hwtstamp_config rxtimestamp timestamping txtimestamp
 
 all: $(TEST_PROGS)
 
+top_srcdir = ../../../../..
 include ../../lib.mk
 
 clean:

tools/testing/selftests/vm/Makefile

@@ -26,10 +26,6 @@ TEST_PROGS := run_vmtests
 
 include ../lib.mk
 
-$(OUTPUT)/userfaultfd: ../../../../usr/include/linux/kernel.h
 $(OUTPUT)/userfaultfd: LDLIBS += -lpthread
 
 $(OUTPUT)/mlock-random-test: LDLIBS += -lcap
-
-../../../../usr/include/linux/kernel.h:
-	make -C ../../../.. headers_install