1TEST_KMOD_DIR := $(realpath $(dir $(abspath $(lastword $(MAKEFILE_LIST))))) 2SRCTREE_KDIR := $(abspath $(TEST_KMOD_DIR)/../../../../..) 3# Honor O=/KBUILD_OUTPUT only if they point at a prepared kernel build 4# directory (one containing Module.symvers); otherwise treat the value as a 5# selftests-only output directory and fall back to in-tree or distro headers. 6# The parent bpf/Makefile resolves O=/KBUILD_OUTPUT to absolute paths before 7# invoking this sub-make so relative paths still anchor to the user's 8# invocation directory. 9KMOD_O := $(or $(O),$(KBUILD_OUTPUT)) 10KMOD_O_VALID := $(if $(KMOD_O),$(if $(wildcard $(KMOD_O)/Module.symvers),$(KMOD_O))) 11KDIR ?= $(if $(KMOD_O_VALID),$(SRCTREE_KDIR), \ 12 $(if $(wildcard $(SRCTREE_KDIR)/Module.symvers),$(SRCTREE_KDIR), \ 13 /lib/modules/$(shell uname -r)/build)) 14 15ifeq ($(V),1) 16Q = 17else 18Q = @ 19endif 20 21MODULES = bpf_testmod.ko bpf_test_no_cfi.ko bpf_test_modorder_x.ko \ 22 bpf_test_modorder_y.ko bpf_test_rqspinlock.ko 23 24$(foreach m,$(MODULES),$(eval obj-m += $(m:.ko=.o))) 25 26CFLAGS_bpf_testmod.o = -I$(src) 27 28# When BPF_STRICT_BUILD != 0, a missing KDIR is fatal (the default). 29# When permissive, skip silently. 30PERMISSIVE := $(filter 0,$(BPF_STRICT_BUILD)) 31 32all: 33ifeq ($(PERMISSIVE),) 34 $(Q)$(MAKE) -C $(KDIR) $(if $(KMOD_O_VALID),O=$(KMOD_O_VALID) KBUILD_OUTPUT=$(KMOD_O_VALID),KBUILD_OUTPUT=) \ 35 M=$(TEST_KMOD_DIR) modules 36else ifneq ("$(wildcard $(KDIR))", "") 37 $(Q)$(MAKE) -C $(KDIR) $(if $(KMOD_O_VALID),O=$(KMOD_O_VALID) KBUILD_OUTPUT=$(KMOD_O_VALID),KBUILD_OUTPUT=) \ 38 M=$(TEST_KMOD_DIR) modules 39endif 40 41clean: 42ifneq ("$(wildcard $(KDIR))", "") 43 $(Q)$(MAKE) -C $(KDIR) $(if $(KMOD_O_VALID),O=$(KMOD_O_VALID) KBUILD_OUTPUT=$(KMOD_O_VALID),KBUILD_OUTPUT=) \ 44 M=$(TEST_KMOD_DIR) clean 45endif 46